arul institute · pvm : 22642647 tbm : 22395248 arul institute pallavaram – tambaram blue print...

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CONTENTS

PHYSICS P.No PHYSICS P.No

1 Blue print 02 17 March – 2011 63

2 March – 2006 03 18 June – 2011 67

3 June – 2006 07 19 October – 2011 71

4 October – 2006 11 20 March – 2012 75

5 March – 2007 15 21 June – 2012 79

6 June – 2007 19 22 October – 2012 83

7 October – 2007 23 23 March – 2013 87

8 March – 2008 27 24 June – 2013 91

9 June – 2008 31 25 October – 2013 95

10 October – 2008 35 26 March – 2014 99

11 March – 2009 39 27 June – 2014 103

12 June – 2009 43 28 October – 2014 107

13 October – 2009 47 29 March – 2015 111

14 March – 2010 51 30 June – 2015 115

15 June – 2010 55 31 October – 2015 119

16 October – 2010 59 32 Answers for 1 mark questions 123

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Physics/Blue print 2 Arul Institute

PVM : 22642647 TBM : 22395248

ARUL INSTITUTEPALLAVARAM – TAMBARAM

BLUE PRINT – PHYSICS – HIGHER SECONDARY – SECOND YEAR

UNIT CHAPTERPART – I

MCQ

(1 mark)

PART – II

VSA

(3 marks)

PART – III

SA

(5 marks)

PART – IV

LA

(10 marks)

TOTAL

MARKS

1. Electrostatics 4 2 1 1 25

2. Current Electricity 1 3 2 0 20

3. Effects of Electric Current 2 1 1 1 20

4. Electromagnetic Induction &

Alternating Current4 2 1 1 25

5. Electromagnetic waves &

Wave Optics4 2 1 1 25

6. Atomic Physics 4 2 1 1 25

7. Dual Nature of Radiation and

Matter & Relativity2 1 2 0 15

8. Nuclear Physics 4 2 1 1 25

9. Semiconductor devices &

their Applications3 4 1 1 30

10. Communication Systems 2 1 1 1 20

No. of Numerical Problems 5 5 3* 0 13 (35)

No. of Theory Questions 25 15 9 8 57 (195)

Total No. of Questions 30 20 12 8 70 (230)

No. of questions to be answered 30 15 7 4 56 (150)

Estimated Time 30 min. 45 min. 45 min. 60 min. 180 min.

*Note : In Part – III, three numerical problems should be given. Out of these three numerical problems,

any one problem should be made compulsory. This compulsory problem should have an

internal choice, provided both the problems must be from same chapter

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Physics/March/2006 3 Arul Institute

MARCH 2006 22642647 / 22395248


Time Allowed : 3 Hours PHYSICS Maximum marks : 150

PART – I 30 x 1 = 30

N.B. : (i) Answer all questions.

(ii) Choose and write the correct answer.

(iii) Each question carries one mark.

1. The unit of reduction factor of a tangent galvanometer is

(a) no unit (b) tesla (c) ampere (d) ampere / degree

2. A galvanometer is converted into a voltmeter by connecting a

(a) low resistance in series (b) high resistance in series

(c) low resistance in parallel (d) high resistance in parallel

3. Electromagnetic induction is not used in

(a) transformer (b) room heater (c) AC generator (d) choke coil

4. The angle between the area vector A and the plane of the area A is

(a) (b) 2 (c) /2 (d) zero

5. If the flux associated with the coil varies at the rate of 1 Wb/minute then the induced emf is

(a) 1 V (b) 1/60 V (c) 60 V (d) 0.60 V

6. The chromium ions doped in the ruby rod

(a) absorbs red light (b) absorbs blue light (c) absorbs green light (d) emits green light

7. The wavelength of D1 and D2 lines emitted by sodium vapour lamp is

(a) 589.6 nm, 589 nm (b) 589 nm, 589.6 nm (c) 589.3 nm, 589 nm (d) 589 nm, 589.3 nm

8. If the minimum wavelength of Xrays produced in a Coolidge tube is 0.62 A, the operating potential is

(a) 20 kV (b) 0.2 kV (c) 2 kV (d) 10 kV

9. Wave number is defined as the number of waves

(a) produced in one second (b) in a distance of 1 metre

(c) in a distance of 3x108 m (d) in a distance of metre

10. The value of stopping potential when the frequency of light is equal to the threshold frequency is

(a) maximum (b) zero (c) minimum (d) infinity

11. The forbidden energy gap for germanium is of the order of

(a) 1.1 eV (b) 0.7 eV (c) 0.3 eV (d) 10 eV

12. The Boolean expression ABC can be simplified as

(a) AB + C (b) C.B.A (c) AB + BC + CA (d) CBA

13. Condition for oscillator is

(a) A = 0 (b) A = 1/ (c) A = (d) A + = 0

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14. High frequency waves follow the

(a) ground wave propagation (b) line of sight direction

(c) ionospheric propagation (d) curvature of the earth

15. In television, blanking pulse is applied to

(a) horizontal plates (b) vertical plates (c) control grid (d) filament

16. The unit of electric flux is

(a) Nm2C1 (b) Nm2C1 (c) Nm2C (d) Nm2C

17. An electric dipole is placed in a uniform electric field with its axis parallel to the field. It experiences

(a) only a net force (b) neither a net force nor a torque

(c) both a net force and a torque (d) only a torque

18. The work done in moving 4 C charge from one point to another in an electric field is 0.012 J. The potential

difference between them is

(a) 3000 V (b) 6000 V (c) 30 V (d) 48 x 103 V

19. The electric field outside the two oppositely charged plane sheets each of charge density is

(a) / 2o (b) – / 2o (c) / o (d) zero

20. Resistance of a metal wire of length 10cm is 2 . If the wire is stretched uniformly to 50cm, the resistance is

(a) 25 (b) 10 (c) 5 (d) 50

21. The average power consumed over one cycle in an AC circuit is

(a) Eo Io cos (b) Erms Irms sin (c) Erms Irms (d) Erms Irms cos

22. The existence of electromagnetic waves was confirmed experimentally by

(a) Hertz (b) Maxwell (c) Huygens (d) Planck

23. When a drop of water is introduced between the glass plate and planoconvex lens in Newton’s rings

system, the rings system

(a) contracts (b) expands

(c) remains same (d) first expands then contracts

24. When a ray of light is incident on a glass surface at polarizing angle of 57.5, the angle between the incident

ray and the reflected ray is

(a) 57.5 (b) 32.5 (c) 115 (d) 90

25. Unpolarised light passes through a tourmaline crystal. The emergent light is analysed by an analyser. When

the analyser is rotated through 90, the intensity of light

(a) remains uniformly bright (b) remains uniformly dark

(c) varies between maximum and minimum (d) varies between maximum and zero

26. If the radius of 3rd Bohr orbit in hydrogen atom is r, then the de Broglie wavelength of electron in this orbit is

(a) r/3 (b) 3 r (c) (2r)/3 (d) 3 (2r)

27. The nuclear force is due to the continuous exchange of particles called

(a) leptons (b) mesons (c) hyperons (d) photons

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28. In the following nuclear reaction 7N14 + 0n

1 X + 1H1, the element X is

(a) 6N14 (b) 6C

14 (c) 6O14 (d) 7C

13

29. The time taken by the radioactive element to reduce to 1/e times is

(a) half-life (b) mean-life (c) half-life / 2 (d) twice the mean-life

30. Which of the following particles is a lepton?

(a) Electron (b) Proton (c) Neutron (d) meson

PART – II 15 x 3 = 45

N.B. : Answer any fifteen questions

31. Define ‘Coulomb” on the basis of Coulomb’s law.

32. Why is it safer to sit inside a car than standing under a tree during lightning?

33. State Ohm’s law.

34. In the following circuit, calculate the current through the circuit. Mention its direction.

A 10V 2V B

5 7

3

5 8V

D C

35. State Faraday’s laws of electrolysis.

36. Mention any two differences between Peltier effect and Joule’s heating effect.

37. Calculate the mutual inductance between two coils when a current of 4 A changing to 8A in 0.5 s in one coil,

induces an e.m.f. of 50 mV in the other coil.

38. Mention the methods of producing induced e.m.f.

39. What are emission and absorption spectra?

40. A 300 mm long tube containing 60 c.c. of sugar solution produces a rotation of 9 when placed in a

polarimeter. If the specific rotation is 60, calculate the quantity of sugar contained in the solution.

41. Write the conditions to achieve laser action.

42. An Xray diffraction of a crystal gave the first line at a glancing angle of 6 27’. If the wavelength of Xray is

0.58 A, find the distance between the two cleavage planes.

43. What are the limitations of electron microscope?

44. What is decay? Give an example.

45. What is pair production and annihilation of matter?

46. What is an intrinsic semiconductor? Give two examples.

47. The gain of an amplifier without feedback is 100 and gain with positive feedback is 200. Calculate the

feedback fraction.

48. Draw the circuit diagram for NPN transistor in Common Emitter (CE) mode.

49. Mention any three advantages of Integrated Circuit (IC).

50. Define modulation factor in amplitude modulation.

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PART – III 7 x 5 = 35

N.B. : (i) Answer the question number 60 compulsorily.

(ii) Answer any six questions of the remaining 11 questions.

(iii) Draw diagrams wherever necessary.

51. A parallel plate capacitor has plates of area 200 cm2 and separation between the plates is 1 mm. Calculate

(i) the potential difference between the plates if 1 nC charge is given to the capacitor. (ii) With the same

charge (1 nC) if the plate separation is increased to 2 mm, what is the new potential difference and (iii) the

electric field between the plates?

52. Define mobility. Establish a relation between drift velocity and current.

53. Obtain the condition for bridge balance in Wheatstone bridge.

54. A circular coil of radius 20 cm has 100 turns of wire and it carries a current of 5 A. Find the magnetic

induction at a point along its axis at a distance of 20 cm from the centre of the coil.

55. Obtain the phase relationship between current and voltage in an AC circuit with an inductor only (graph not

necessary).

56. Write a note on pile of plates.

57. Explain the spectral lines of hydrogen atom without diagram.

58. Obtain Einstein’s photoelectric equation.

59. Explain FitzGerald Lorentz contraction with example.

60. A piece of bone from an archaeological site is found to give a count rate of 15 counts per minute. A similar

sample of fresh bone gives a count rate of 19 counts per minute. Calculate the age of the specimen.

(Given T1/2 = 5570 years) [OR]

Calculate the energy released when 1 kg 92 U 235 undergoes nuclear fission. Assume energy per fission is

200 MeV, Avogadro number = 6.023 X 1023. Express your answer in kilowatt hour also.

61. State and prove de Morgan’s theorems.

62. What are the advantages and disadvantages of digital communication?

PART – IV 4 x 10 = 40

N.B. : (i) Answer any four questions in detail.

(ii) Draw diagrams wherever necessary.

63. What is an electric dipole? Derive an expression for the electric field due to an electric dipole at a point on its

axial line.

64. Applying Biotsavart law, obtain an expression for the magnetic induction at a point due infinitely long

straight conductor carrying current.

65. Explain the principle, construction and theory of a transformer. (Diagram not necessary). Define its

efficiency. Mention the energy losses.

66. On the basis of wave theory, explain total internal reflection.

67. State Bohr’s postulates. Obtain an expression for the radius of nth orbit of hydrogen atom.

68. What is a nuclear reactor? Explain the functions of (i) moderator, (ii) control rods and (iii) neutron reflector.

Mention the uses of nuclear reactor. (Diagram not necessary)

69. What is rectification? Explain the working of a bridge rectifier with necessary waveforms.

70. With the help of block diagram, explain the function of monochrome TV receiver.

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Physics/June/2006 7 Arul Institute

JUNE 2006 22642647 / 22395248



PART – I 30 x 1 = 30




1. Two photons, each of energy 2.5 eV are simultaneously incident on the metal surface. If the work function of

the metal is 4.5 eV then from the surface of the metal

(a) one electron will be emitted (b) two electrons will be emitted

(c) more than two electrons will be emitted (d) not a single electron will be emitted

2. One amu is equal to

(a) 931 eV (b) mass of carbon atom (c) 1.66 x 10–27 kg (d) mass of oxygen atom

3. The time taken by a radioactive element to reduce to e–1/2 times its original amount is its

(a) half-life period (b) half-life period/2 (c) mean-life period (d) mean-life period/2

4. The radio-isotope used in agriculture is

(a) 15P32 (b) 11Na23 (c) 27Co60 (d) 11Na24

*5. Based on quark model, a neutron is represented as [Not in the new syllabus]

(a) uud (b) udd (c) udd’ (d) u’du

6. In LCR series AC circuit, the phase difference between current and voltage is 30°. The reactance of the

circuit is 17.32 Ω. The value of resistance is

(a) 30 Ω (b) 10 Ω (c) 17.32 Ω (d) 1.732 Ω

7. In an electromagnetic wave, the phase difference between electric field E and magnetic field B is

(a) /4 (b) /2 (c) (d) zero

8. Velocity of electromagnetic wave through vacuum is

(a) oo (b) oo

1

(c)

o

o

(d) o

o

9. In a plane diffraction grating, the unit of grating element is

(a) no unit (b) metre (c) metre–1 (d) degree

10. A ray of light is incident on a glass plate at its polarising angle. The angle between the incident ray and the

reflected ray is

(a) 57.5° (b) 32.5° (c) 90° (d) 115°

11. Which of the following quantities is a scalar?

(a) Electric force (b) Electric field (c) Dipole moment (d) Electric potential

12. Torque on a dipole in a uniform electric field is maximum when angle between P and E is

(a) 0° (b) 90° (c) 45° (d) 180°

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13. Potential energy of two equal negative point charges of magnitude 2 μC placed 1m apart in air is

(a) 2 J (b) 0.36 J (c) 4 J (d) 0.036 J

14. The colour code on a carbon resistor is red-red-black. The resistance of the resistor is

(a) 2.2 Ω (b) 22 Ω (c) 220 Ω (d) 2.2 kΩ

15. A hollow metallic spherical shell carrying an electric charge produces no electric field at points

(a) on the surface of the sphere (b) inside the sphere

(c) at infinite distance from the centre of the sphere (d) outside the sphere

16. The potential barrier of silicon PN junction diode is approximately

(a) 0.3 V (b) 0.7 V (c) 1.1 V (d) 10 V

17. The colour of light emitted by a LED depends on

(a) its reverse bias (b) amount of forward current

(c) its forward bias (d) type of semiconductor material

18. The Boolean Expression to represent NAND operation is

(a) Y = A+B (b) Y = A.B (c) Y = A (d) Y = AB

19. High frequency waves follow

(a) ground wave propagation (b) ionospheric propagation

(c) the curvature of the earth (d) the line of sight direction

20. In an AM superheterodyne receiver, the local oscillator frequency is 1.245 MHz. The tuned station frequency is

(a) 455 kHz (b) 790 kHz (c) 690 kHz (d) 990 kHz

21. The energy of the electron in the first orbit of hydrogen atom is –13.6 eV. Its potential energy is

(a) –13.6 eV (b) 13.6 eV (c) –27.2 eV (d) 27.2 eV

22. In an X-ray tube, the intensity of the emitted X-ray beam is increased by

(a) increasing the filament current (b) decreasing the filament current

(c) increasing the target potential (d) decreasing the target potential

23. In hydrogen atom, which of the following transitions produce spectral line of maximum frequency?

(a) 2→1 (b) 6→2 (c) 4→3 (d) 5→1

24. The chromium ions doped in ruby rod

(a) absorbs red light (b) absorbs green light (c) absorbs blue light (d) emits green light

25. According to the theory of relativity the length of a rod in motion

(a) is less than its rest length

(b) is same as its rest length

(c) is more than its rest length

(d) may be more or less than rest length depending upon the speed of the rod

26. Nichrome is used as heating element because it has

(a) very low resistance (b) low melting point

(c) high specific resistance (d) high conductivity

27. Of the following devices, which has small resistance?

(a) Voltmeter (b) Ammeter of range 0 – 10 A

(c) Moving coil galvanometer (d) Ammeter of range 0 – 1 A

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28. An emf of 12 V is induced when the current in the coil changes from 2 A to 6 A in 0.5s. The co-efficient of

self-induction of the coil is

(a) 1.5 H (b) 6 H (c) 0.3 H (d) 30 H

29. In an AC circuit with an inductor

(a) voltage lags current by /2 (b) Voltage and current are in phase

(c) voltage leads current by (d) current lags voltage by /2

30. The unit of henry can also be written as

(a) V A s–1 (b) Wb–1 A (c) Ω s (d) all of these

PART – II 15 x 3 = 45


31. State Gauss’ law in electrostatics.

32. Why is it safer to be inside a car than standing under a tree during lightning?

33. Write any three applications of superconductors.

34. A manganin wire of length 2 m has a diameter of 0.4 mm with a resistance of 70 Ω. Find the resistivity of the

material.

35. State Kirchoff’s (i) current law and (ii) voltage law.

36. Define Peltier co-efficient and write its unit.

37. State Faraday’s laws of electromagnetic induction.

38. An aircraft having a wingspan of 20.48 m flies due north at a speed of 40 ms-1. If the vertical component of

earth’s magnetic field at the place is 2x10-5 T, calculate the e.m.f. induced between the ends of the wings.

39. Why does the sky appear blue in colour?

40. In Young’s experiment, the width of the fringe obtained with light of wavelength 6000 A° is 2 mm. Calculate

the fringe width if the entire apparatus is immersed in a liquid of refractive index 1.33.

41. Write the principle of Millikan’s oil drop experiment.

42. Calculate the longest wavelength that can be analysed by a rock salt crystal of spacing d = 2.82 A° in the

first order.

43. Write any three uses of photoelectric cells.


45. Write any three properties of neutron.

46. Define input impedance of a transistor connected in common emitter mode.

47. When the negative feedback is applied to an amplifier of gain 50, the gain falls to 25. Calculate the feedback

ratio.

48. Draw the circuit diagram for OR gate using diodes.

49. What is an extrinsic semi-conductor?

50. Write any three applications of RADAR.

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PART – III 7 x 5 = 35




51. Three capacitors each of capacitance 9 pf are connected in series. (i) What is the total capacitance of the

combination? (ii) What is the potential difference across each capacitor, if the combination is connected to

120V supply?

52. Obtain the condition for bridge balance in Wheatstone’s bridge.

53. State and verify Faraday’s second law of electrolysis.

54. A rectangular coil of 500 turns and of area 6x10–4 m2 is suspended inside a radial magnetic field of induction

10–4 T by a suspension wire of torsional constant 5x10–10 Nm per degree. Calculate the current required to

produce deflection of 10°.

55. What are the reasons for various energy losses in a transformer? Explain how they can be minimised?

56. State and prove Brewster law.

57. Mention any five properties of X-rays.

58. Derive Einstein’s photoelectric equation.

59. Explain time-dilation with an example.

60. Find the energy released when two 1H2 nuclei fuse together to form a single 2He4 nucleus. Given the binding

energy per nucleon of 1H2 and 2He4 are 1.1 MeV and 7.0 MeV respectively. [OR]

A reactor is developing energy at the rate of 32 MW. Calculate the required number of fissions per second of

92U235. Assume that energy per fission is 200 MeV.

61. Explain the working of a bridge rectifier with a neat circuit diagram.

62. Write the advantages and disadvantages of digital communication.

PART – IV 4 x 10 = 40




axial line.

64. Derive an expression for the magnetic induction due to an infinitely long straight conductor carrying current.

Write the expression for the magnetic induction when the conductor is placed in a medium of permeability μ.

65. A source of an alternating e.m.f. is connected to a series combination of a resistor R, an inductor L and a

capacitor C. Obtain with the help of a voltage phasor diagram and impedance diagram, expressions for (a)

effective voltage (b) the impedance (c) phase relationship between the current and voltage.

66. On the basis of wave theory, explain total internal reflection. Write the conditions for the total internal reflection

to take place.

67. Draw a neat diagram of He-Ne laser and explain its working with the help of energy level diagram.

68. Describe the principle and action of a Bainbridge Mass Spectrometer in determining the isotopic masses.

69. Sketch the circuit of a Colpitt’s oscillator and explain its working.

70. Make an analysis of amplitude modulated wave. Plot the frequency spectrum.

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OCTOBER 2006 22642647 / 22395248



PART – I 30 x 1 = 30




1. The forbidden energy gap for silicon is of the order of

(a) 0.7 eV (b) 0.4 eV (c) 1.1 eV (d) 10 eV

2. In CE single stage amplifier, the voltage gain at mid-frequency is 10. The voltage gain at upper cut-off

frequency is

(a) 10 (b) 14.14 (c) 7.07 (d) 20

3. The following arrangement performs the logic function of

(a) AND gate (b) OR gate A Y

(c) NAND gate (d) EX-OR gate B

4. The radiowaves after refraction from different parts of ionosphere on reaching the earth are called as

(a) ground waves (b) sky waves (c) space waves (d) microwaves

5. The principle used for transmission of light signals through optical fibre is

(a) refraction (b) diffraction (c) polarisation (d) total internal reflection

6. According to special theory of relativity the only constant in all frames is

(a) mass (b) length (c) time (d) velocity of light

7. The value of 1 amu is

(a) 931 eV (b) mass of carbon atom (c) mass of one proton (d) 1.66 x 10-27 kg

8. The penetrating power is maximum for

(a) α-particles (b) β-particles (c) gamma rays d) protons

9. In the following nuclear reaction 13Al27 + 2He4 → X + 0n1, the element X is

(a) 15Si30 (b) 15P30 (c) 15S

30 (d) 15Si29

*10. Based on quark model, a neutron is represented as [Not in the new syllabus]

(a) uud (b) udd (c) udd’ (d) u’du

11. In Sommerfeld atom model, for a given value of n, the number of values l can take is

(a) n (b) n+1 (c) n –1 (d) 2n+1

12. The ratio of areas enclosed by first three Bohr orbits of hydrogen atom is

(a) 1 : 2 : 3 (b) 1 : 8 : 27 (c) 1 : 4 : 9 (d) 1 : 16 : 81

13. In hydrogen atom, which of the following transitions produces spectral line of maximum wavelength?

(a) 2→1 (b) 3→2 (c) 4→3 (d) 5→4

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14. In holography, which of the following is (are) recorded on the photographic film?

(a) Frequency & amplitude (b) Phase & frequency (c) Phase & amplitude (d) Frequency only

15. At the threshold frequency, the velocity of the photoelectrons is

(a) maximum (b) minimum (c) infinity (d) zero

16. In a step-up transformer, the input voltage is 220V and the output voltage is 11kV. The ratio of number of

turns of primary to secondary is

(a) 50 : 1 (b) 1 : 50 (c) 25 : 1 (d) 1 : 25

17. Which one of the following is not an electromagnetic wave?

(a) X-rays (b) -rays (c) UV-rays (d) β-rays

18. If C is the velocity of light in vacuum, the velocity of light in a medium with refractive index is

(a) C (b) C/ (c) /C (d) 1/C

19. A ray of light passes from a denser medium into a rarer medium. For an angle of incidence of 45°, the

refracted ray grazes the surface of separation of the two media. The refractive index of the denser medium is

(a) 3/2 (b) 1/ 2 (c) 2 (d) 2

20. Of the following, which one is a uniaxial crystal?

(a) Mica (b) Aragonite (c) Topaz (d) Quartz

21. In a thermocouple, the temperature of the cold junction is 20°C, the inversion temperature is 600°C, then the

neutral temperature is

(a) 310°C (b) 320°C (c) 300°C (d) 315°C

22. In a tangent galvanometer a current of 1A, produces a deflection of 30°. The current required to produce a

deflection of 60° is

(a) 3A (b) 2A (c) 3 A (d) 1 / 3 A

23. The generator rule is

(a) Fleming’s left hand rule (b) Fleming’s right hand rule

(c) Maxwell’s right hand corkscrew rule (d) Right hand palm rule

24. The power loss is less in transmission line when

(a) voltage is less but current is more (b) both voltage and current are more

(c) voltage is more but current is less (d) both voltage and current are less

25. In an AC circuit, the current I = I0 sin(t – /2) lags behind the e.m.f e = E0sin(t + /2) by

(a) 0 (b) /4 (c) /2 (d)

26. The unit of electric field intensity is

(a) NC–2 (b) NC (c) Vm–1 (d) Vm

27. Four charges +q, +q, –q and –q respectively are placed at the corners A, B, C and D of a square of side a.

The electric potential at the centre O of the square is

(a) a

q

4

1

o(b)

a

q2

4

1

o(c)

a

q4

4

1

o(d) zero

28. A copper wire has a resistance R. On doubling its length, the specific resistance

(a) will be doubled (b) will be halved (c) will become four times (d) will remain the same

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29. The value of permittivity of free space is

(a) 8.854 x 1012 C2 N–1m–2 (b) 9 x 109 C2 N–1m–2 (c) 2129

mNC109

1

(d) 212

9mNC

1094

1

30. The principle used in lightning conductors is

(a) corona discharge (b) mutual induction

(c) self-induction (d) electromagnetic induction

PART – II 15 x 3 = 45


31. State Gauss’ law in electrostatics. R1 = 5 R2 = 3 R3 = 2

32. What is meant by electric polarisation? V1 V2 V3

33. Define mobility of electrons. Give its unit. I

34. Write any three applications of superconductors. 10V

35. Three resistors are connected in series with 10V supply as shown in the figure. Find the voltage drop across

each resistor.

36. Mention the limitations of cyclotron.

37. Define quality factor.

38. The wings of an aeroplane are 10m apart. The plane is moving horizontally towards the north at a place

where the vertical component of earth’s magnetic field is 3 x 10–5 T. Calculate the induced e.m.f. set up

between the tips of the wings if the velocity of the aeroplane is 720 km/hr.

39. What is band emission spectrum? Give an example.

40. A light of wavelength 6000 A° falls normally on a thin air film. 6 dark fringes are seen between two points.

Calculate the thickness of the air film.

41. What are the characteristics of laser?

42. Rydberg constant for hydrogen atom is 1.097 x 107 m–1. Calculate the shortest wavelength of the spectral

line of its Lyman series.

43. What are inertial and non-inertial frames of reference?

44. Write any three conclusions obtained from Binding energy curve?

45. Define Curie.

46. Draw the circuit diagram for NPN transistor at Common Emitter (CE) mode.

47. What is zener breakdown?

48. The voltage gain of an amplifier without feedback is 100. If negative feedback is applied with a feedback

fraction β = 0.1, calculate the voltage gain after feedback.

49. Mention any three advantages of Integrated Circuit (IC).

50. What is fax? Mention its use.

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51. Three capacitors each of capacitance 9 pf are connected in series. (i) What is the total capacitance of the

combination? (ii) What is the potential difference across each capacitor, if the combination is connected to

120V supply?

52. If two or more resistors are connected in parallel, derive an expression for the effective resistance.




55. What are the different energy losses in a transformer? How can they be minimised?

56. State and prove Brewster’s law.

57. Describe Laue experiment. What are the facts established by it?

58. Write any five applications of photoelectric cells.

59. Derive an expression for de Broglie wavelength of matter waves.

60. Show that the mass of radium (88Ra226) with an activity of 1 curie is almost one gram.

(Given T1/2=1600yrs, 1 curie= 3.7x1010 disintegrations per second) [OR]

Calculate the mass of coal required to produce the same energy as that produced by the fission of 1kg of U235.

(Given heat of combustion of coal = 33.6 x 106 JKg–1 ; Energy per fission of U235 = 200 MeV

1eV = 1.6 x 10–19 J ; Avogadro number N = 6.023 x 1023 )

61. State and prove De-Morgan’s theorems.

62. Explain space wave propagation of radiowaves.

PART – IV 4 x 10 = 40



63. Derive an expression for the electric potential at a point due to an electric dipole. Discuss the special cases.

64. Define Ampere’s circuital law. Applying it, find the magnetic induction due to a long solenoid carrying current.

65. In an AC circuit containing a capacitor, the instantaneous e.m.f is e = E0sint. Obtain the expression for

instantaneous current. Explain the phase relationship between e.m.f and current by graph.

66. Derive an expression for bandwidth of interference fringes in Young’s double slit experiment.

67. Draw a neat sketch of Ruby laser. Explain its working with the help of energy level diagram.

68. Explain the principle and action of a Bainbridge Mass Spectrometer in determining the isotopic masses.

69. With the circuit diagram explain the construction and working of a Colpitt’s Oscillator.


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PART – I 30 x 1 = 30




1. Barkhausen condition for maintenance of oscillation is

(a) = 1/A (b) A = (c) A = (d) A = 1/2

2. Find the voltage across the resistor 2.7 V

as shown in the figure (silicon diode is used).

(a) 2.4 V (b) 2 V 180

(c) 1.8 V (d) 0.7 V

3. The output (Y) of the logic circuit given below is

(a) A + B (b) A . B A Y

(c) BA (d) BA B

4. Digital signals are converted into analog signals using

(a) FAX (b) modem (c) cable (d) coaxial cable

5. The work function of a metal is 6.626 x 1019 J. The threshold frequency is

(a) 1 x 1015 Hz (b) 10 x 1019 Hz (c) 1 x 1015 Hz (d) 10 x 1019 Hz

6. The RF channel in a radio transmitter produces

(a) audio signals (b) high frequency carrier waves

(c) low frequency carrier waves (d) both audio signal and high frequency carrier waves

7. Anaemia can be diagnosed by

(a) 15P31 (b) 15P

32 (c) 26Fe59 (d) 11Na24

8. The moderator used in nuclear reactor is

(a) Cadmium (b) Boron carbide (c) Heavy water (d) Uranium (92U235)

9. The numbers of and particles emitted when an isotope 92U238 undergoes and decays to form 82Pb206

are respectively

(a) 6, 8 (b) 4, 3 (c) 8, 6 (d) 3, 4

10. The nuclei 13Al27 and 14Si28 are examples of

(a) isotopes (b) isobars (c) isotones (d) isomers

11. If a and b are semimajor and semiminor axes of the ellipse respectively and l is the orbital quantum

number, then the expression to find the possible elliptical orbits is

(a) b/a = (l + 1)/n (b) b/a = (l 1)/n (c) a/b = (l + 1)/n (d) a/b = (l 1)/n

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12. Xray is

(a) phenomenon of conversion of KE into radiation (b) conversion of momentum

(c) conversion of mass into energy (d) conversion of light energy into heat energy

13. According to Bohr’s postulates, which of the following quantities take discrete values?

(a) Kinetic energy (b) Potential energy (c) Angular momentum (d) momentum

14. A crystal diffracts monochromatic X rays. If the angle of diffraction for the second order is 90 , then that for

the first order will be

(a) 60 (b) 45 (c) 30 (d) 15

15. According to special theory of relativity the only constant in all frames of reference is

(a) mass (b) length (c) time (d) velocity of light

16. In LCR circuit when XL = XC, the current

(a) is zero (b) is in phase with the voltage

(c) leads the voltage (d) lags behind the voltage

17. The radiations used in physiotherapy are

(a) ultraviolet (b) infrared (c) radiowaves (d) microwaves

18. In Newton’s rings experiment, light of wavelength 5890 A is used. The order of the dark ring produced

where the thickness of the air film is 0.589 m is

(a) 2 (b) 3 (c) 4 (d) 5

19. Atomic spectrum should be _________ spectrum.

(a) pure line (b) emission band (c) absorption line (d) absorption band

20. Of the following, optically active material is

(a) sodium chloride (b) calcium chloride (c) sodium (d) chlorine

21. Peltier effect is the converse of

(a) Joule effect (b) Raman effect (c) Thomson effect (d) Seebeck effect

22. The torque experienced by a rectangular current loop placed perpendicular to a uniform magnetic field is

(a) maximum (b) zero (c) finite minimum (d) infinity

23. Transformer works on

(a) both AC and DC (b) AC only

(c) DC only (d) AC more effectively than DC

24. Lenz law is in accordance with the law of conservation of

(a) energy (b) charge (c) momentum (d) angular momentum

25. The selfinductance of a straight conductor is

(a) zero (b) infinity (c) very large (d) very small

26. A dipole is placed in a uniform electric field with its axis parallel to the field. It experiences

(a) only a net force (b) only a torque

(c) neither a net force nor a torque (d) both a net force and a torque

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27. The unit of electric dipole moment is

(a) volt/metre (V/m) (b) Coulomb/metre (C/m) (c) volt.metre (Vm) (d) Coulomb.metre (Cm)

28. Electric potential energy of a dipole in an electric field is given as

(a) pE sin (b) pE sin (c) pE cos (d) pE cos

29. Electric field intensity is 400 V/m at a distance of 2 m from a point charge. It will be 100 V/m at a distance of

(a) 50 cm (b) 4 cm (c) 4 m (d) 1.5 m

30. The brown ring at one end of a carbon resistor indicates a tolerance of

(a) 1 % (b) 2 % (c) 5 % (d) 10 %

PART – II 15 x 3 = 45


31. Define electric potential at a point.

32. What is a polar molecule? Give any two examples.

33. State Kirchoff’s voltage law.

34. Define drift velocity.

35. The resistance of a platinum wire at 0C is 4 . What will be the resistance of the wire at 100C if the

temperature coefficient of resistance of platinum is 0.0038 / C?

36. In a galvanometer, increasing the current sensitivity does not necessarily increase the voltage sensitivity.

Explain.

37. State Fleming’s right hand rule.

38. A coil of area of cross section 0.5 m2 with 10 turns is in a plane perpendicular to a uniform magnetic field of

0.2 Wb/m2. Calculate the flux through the coil.

39. What is Tyndall scattering?

40. In Newton’s rings experiment the diameter of certain order of dark ring is measured to be double that of

second ring. What is the order of the ring?

41. State Moseley’s law.

42. Define ionisation potential.

43. Mention the uses of electron microscope.

44. What is meant by pair production and annihilation?

45. The halflife of radon is 3.8 days. Calculate its mean life.

46. What is rectification?

47. What is a light emitting diode? Give any one of its uses.

48. Define bandwidth of an amplifier.

49. When there is no feedback the gain of the amplifier is 100. If 5% of the output voltage is fed back into

the input through a negative feed back network, find out the voltage gain after feedback.

50. What are the advantages of digital communication?

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51. Write the properties of lines of forces.

52. How will you compare the e.m.f.s of two cells using a potentiometer?

53. A moving coil galvanometer of resistance 20 produces full-scale deflection for a current of 50 mA. How will

you convert the galvanometer into (i) an ammeter of range 20 A (ii) a voltmeter of range 120 volt?

54. Give the applications of eddy currents.

55. Write a note on Nicol prism.

56. Wavelength of Balmer second line is 4861 A. Calculate the wavelength of the first line.


58. Define work function. State the laws of photoelectric emission.

59. Explain how a cosmic ray shower is formed.

60. In the given network, calculate the effective resistance between points A and B.

5 10 5 10 5 10

A B

10 5 10 5 10 5

[OR]

The effective resistances are 10, 2.4 when two resistors are connected in series and parallel. What are

the resistances of individual resistors?

61. With the circuit diagram, explain voltage divider biasing of a transistor.

62. Mention the principle of RADAR and write its applications.

PART – IV 4 x 10 = 40



63. Derive an expression for electric field due an electric dipole at a point along the equatorial line.

64. Explain in detail the principle, construction, working and limitations of a cyclotron with a diagram.

65. Explain the principle, construction and working of a single phase AC generator.

66. Explain Raman scattering of light with the help of energy level diagram.

67. How will you determine the wavelength of Xrays using Bragg’ spectrometer? Write any five properties of

Xrays.

68. Explain the construction and working of a GM (GeigerMuller) counter.

69. With circuit diagram, explain the working of an operational amplifier as a summing amplifier.

70. With the help of a block diagram, explain the functions of various units in the monochrome television

receiver.

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PART – I 30 x 1 = 30




1. In a tangent galvanometer, for a constant current, the deflection is 30°. The plane of the coil is rotated

through 90°. Now for same current, the deflection will be

(a) 30° (b) 60° (c) 90° (d) 0°

2. In which of the following pairs of metals of a thermocouple the e.m.f is maximum?

(a) Fe-Cu (b) Cu-Zn (c) Pt-Ag (d) Sb-Bi

3. In an AC circuit with capacitor only, if the frequency of the signal is zero, then the capacitive reactance is

(a) infinity (b) zero (c) finite maximum (d) finite minimum



5. In step-up transformer the output voltage is 11kV and the input voltage is 220V. The ratio of number of turns

secondary to primary is

(a) 20 : 1 (b) 22 : 1 (c) 50 : 1 (d) 1 : 50

6. If R is Rydberg’s constant, the minimum wavelength of hydrogen spectrum is

(a) 1/R (b) R/4 (c) 4/R (d) R

7. According to Bohr’s postulates, which of the following quantities takes discrete values?

(a) Kinetic energy (b) Potential energy (c) Angular Momentum (d) Momentum

8. The ratio of the radii of the first three Bohr orbit is

(a) 1 : 1/2 : 1/3 (b) 1 : 2 : 3 (c) 1 : 4 : 9 (d) 1 : 8 : 27

9. In holography, which of the following are recorded on a photographic film?

(a) Amplitude and Frequency (b) Phase and Frequency

(c) Phase and Amplitude (d) Amplitude, Phase and Frequency

10. The momentum of the electron having wavelength 2Ao is

(a) 3.3 x 1024 Kg m s–1 (b) 6.6 x 1024 Kg m s–1 (c) 3.3 x 10–24 Kg m s–1 (d) 6.6 x 10–24 Kg m s–1

11. The output of the given 100 K

operational amplifier (Op-Amp) is 10 K

(a) –2 Sinωt (b) 2 Sinωt Vin = 0.2 sint Vout

(c) –2 Sin(ωt+10°) (d) 2 Sin(ωt+10°)

12. A logic gate for which there is ‘Low’ output only when both the inputs are ‘High’ is

(a) AND (b) NAND (c) NOR (d) EXOR

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13. The symbol to represent LED is

(a) (b) (c) (d)

14. In amplitude modulation, the bandwidth is

(a) equal to signal frequency (b) twice the signal frequency

(c) thrice the signal frequency (d) four times the signal frequency

15. In interlaced scanning, time taken to scan one line is

(a) 20 ms (b) 64 μs (c) 50 ms (d) 100 μs

16. Which of the following is not a dielectric?

(a) Ebonite (b) Mica (c) Oil (d) Gold

17. The work done in moving 500 μC charge between two points on equipotential surface is

(a) zero (b) finite positive (c) finite negative (d) infinity

18. In the given circuit, the effective capacitance 3μF 6μF

between A and B will be

(a) 3 μF (b) 36/13 μF A B

(c) 13 μF (d) 7 μF 2μF 2μF

19. The direction of electric field at a point on the equatorial line due to an electric dipole is

(a) along the equatorial line and towards the dipole

(b) along the equatorial line and away from the dipole

(c) parallel to the axis of the dipole and opposite to the direction of dipole moment

(d) parallel to the axis of the dipole and in the direction of dipole moment

20. The unit of conductivity is

(a) mho (b) ohm (c) ohm-m (d) mho-m-1

21. The generator rule is

(a) Fleming’s left hand rule (b) Fleming’s right hand rule

(c) Maxwell’s right hand cork screw rule (d) Ampere’s swimming rule

22. When a drop of water is introduced between the glass plate and plano-convex lens in Newton’s ring system,

the ring system


(c) remains same (d) first expands, then contracts

23. Electric filament lamp gives rise to _________ spectrum.

(a) line (b) continuous (c) band (d) line absorption

24. In Young’s double slit experiment, the separation between the slits is halved and the distance between the

slits and the screen is doubled. Then the fringe width is

(a) unchanged (b) halved (c) doubled (d) quadrupled

25. The particles which exchange between the nucleons and responsible for the origin of the nuclear force are

(a) photons (b) leptons (c) mesons (d) baryons

26. A diffraction pattern is obtained using a beam of red light. What happens if the red light is replaced by blue

light?

(a) Bands disappear (b) Diffraction pattern becomes narrower and crowded together

(c) No change (d) Diffraction pattern becomes broader and further apart

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27. According to relativity, the length of a rod in motion

(a) is same as its rest length

(b) is more than its rest length

(c) is less than its rest length

(d) may be more or less than or equal to rest length depending on the speed of the rod


(a) 15P31 (b) 15P

32 (c) 26Fe59 (d) 11Na24

29. Which of the following is not a moderator?

(a) Liquid sodium (b) Ordinary water (c) Graphite (d) Heavy water

30. An element zXA successively undergoes three α-decays and four β-decays and gets converted to an element

Y. The mass number and atomic number of the element Y are respectively

(a) A – 12, Z – 2 (b) A –12, Z + 2 (c) A –12, Z + 4 (d) A – 8, Z + 2

PART – II 15 x 3 = 45


31. State Coulomb’s law in electrostatics.

32. What is corona discharge? What are its advantages?


34. Distinguish between electromotive force and potential difference.

35. The resistance of a nichrome wire at 0°C is 10Ω. If its temperature co-efficient of resistance is 0.004/°C, find

its resistance at boiling point of water. Comment on the result.

36. Why is nichrome used as a heating element?

37. Define r.m.s. value of alternating current.

38. State Faraday’s Laws of electromagnetic induction.

39. In Newton’s ring experiment, the diameter of certain order of dark ring is measured to be double that of


40. Define optic axis of a crystal.

41. How much should be the voltage of an X-ray tube so that the electrons emitted from the cathode may give

an X-ray of wavelength 1Ao after striking the target?

42. What are the conditions to achieve laser action?

43. What is the de Broglie wavelength of an electron of kinetic energy 120eV?

44. Define Roentgen.

45. Find the output of the amplifier circuit given below:

100 k 100 k

50 k 100 k Vin = 1V Vout

5V 100 k 100 k

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46. Write a note on Leptons.


48. What are the advantages of negative feedback?

49. Draw the circuit diagram of AND gate using diodes and resistor.

50. What is meant by skip distance?

PART – III 7 x 5 = 35




51. Two capacitors of capacitances 0.5μF and 0.75μF are connected in parallel and the combination to a 110V

battery. Calculate the charge from the source and charge on each capacitor. [OR]

A square of side 1.3m has charges +12nC, –24nC, +31nC and +17nC at its corners. Calculate the electric

potential at the centre of the square.

52. State and explain Kirchoff’s second law for electrical network.

53. Explain the working of a Leclanche cell with a diagram.

54. What are the special features of magnetic Lorentz force?

55. Explain how an e.m.f can be induced by changing the area enclosed by the coil.


57. In Bragg’s spectrometer, the glancing angle for first order spectrum was observed to be 8°. Calculate the

wavelength of X-rays, if d = 2.82 x 10–10 m. At what angle will be second maximum occur?

58. Write any five applications of photo-electric cells.

59. Obtain Einstein’s mass-energy equivalence.

60. If the mass defect of the nucleus 6C12 is 0.098 amu, then calculate the binding energy per nucleon.

61. Define current amplification factor α and β and obtain the relation between them.

62. Write a short note on fiber optical communication and mention its advantages.

PART – IV 4 x 10 = 40



63. Deduce an expression for the equivalent capacitance of capacitors connected (i) in series and (ii) in parallel.

64. State Joule’s law. Explain Joule’s calorimeter experiment to verify Joule’s law of heating.



67. Derive Bragg’s law. Explain how a Bragg’s spectrometer can be used to determine the wavelength of the

X-rays.

68. Describe the principle and action of a Bainbridge mass spectrometer to determine the isotopic masses.

69. With the circuit diagram, explain the working of a Bridge rectifier. Draw its input and output signals.

70. With the help of functional block diagram, explain the operation of a superheterodyne AM receiver.

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PART – I 30 x 1 = 30




1. Which one of the following principles is used in a thermopile?

(a) Thomson effect (b) Peltier effect (c) Seebeck effect (d) Joule’s effect

2. An ideal voltmeter has

(a) zero resistance (b) finite resistance between zero and G

(c) resistance greater than G but less than infinity (d) infinite resistance


(a) AC only (b) DC only

(c) both AC and DC (d) AC more effectively than DC

4. The reactance offered by 300 mH inductor to an AC supply of frequency 50 Hz is

(a) 1046 Ω (b) 94.2 Ω (c) 9420 Ω (d) 104.6 Ω

5. The rms value of an AC voltage with a peak value of 311 V is

(a) 110 V (b) 220 V (c) 50 V (d) 70.7 V

6. The unit of Rydberg constant is

(a) m (b) no unit (c) m–2 (d) m–1

7. For the first order X-ray diffraction, the wavelength the of X-ray is equal to the lattice spacing at a glancing

angle of

(a) 15° (b) 60° (c) 45° (d) 30°


(a) Kinetic energy (b) Potential energy (c) Angular Momentum (d) Momentum

9. A Coolidge tube operates at 18600 V. The maximum frequency of X-ray radiation emitted from it is

(a) 4.5 x 1018 Hz (b) 45 x 1018 Hz (c) 4.05 x 1018 Hz (d) 45.5 x 1018 Hz

10. When a material particle of rest mass ‘m0’ attains the velocity of light, its mass becomes

(a) 0 (b) 2m0 (c) 4m0 (d)

11. The output voltage of the operational +2V R R

amplifier (Op-Amp) given below is

(a) –1V (b) +1V –3V R Vout

(c) +5V (d) –5V

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12. Avalanche breakdown is primarily dependent on the phenomenon of

(a) collision (b) ionization (c) doping (d) recombination

13. In a junction transistor the emitter region is heavily doped since emitter has to supply to the base

(a) minority carriers (b) majority carriers (c) acceptor ions (d) donor ions

14. A logic gate which has an output ‘1’, only when the inputs are complement to each other is


15. The first man-made satellite is

(a) Aryabhatta (b) Sputnik (c) Venera (d) Rohini

16. The number of electric lines of force originating from a charge of 1 microcoulomb is

(a) 1.129 x 105 (b)1.6 x 10–19 (c) 6.25 x 1018 (d) 8.85 x 10–12

17. The equivalent capacitance of two capacitors in series is 1.5 F. The capacitance of one of them is 4F. The

value of capacitance of the other is

(a) 2.4 F (b) 0.24 F (c) 0.417 F (d) 4.17 F

18. The law that governs the force between electric charges is

(a) Ampere’s law (b) Faraday’s law (c) Coulomb’s law (d) Ohm’s law



(c) both a net force and a torque (d) neither a net force nor a torque

20. The material through which electric charge can flow easily is

(a) quartz (b) mica (c) germanium (d) copper

21. The core used in audio frequency chokes is

(a) iron (b) carbon (c) lead (d) steel

22. The phenomenon of light used in the formation of Newton’s rings is

(a) diffraction (b) interference (c) refraction (d) polarization

23. An example for uniaxial crystal is

(a) tourmaline (b) mica (c) topaz (d) selenite

24. In Raman effect, the special line with lower frequency than the incident frequency is

(a) Fraunhofer line (b) Rayleigh line (c) Stoke’s line (d) anti-Stoke’s line

25. The optical rotation does not depend on

(a) concentration of the solution (b) frequency of the light used

(c) the temperature of the solution (d) intensity of the light used

26. A photon of frequency is incident on a metal surface of threshold frequency 0. The kinetic energy of the

emitted photoelectron is

(a) h(-o) (b) h (c) h0 (d) h(+0)



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28. The fuel used in Kamini reactor is

(a) 92U238 (b) 92U

233 (c) 92Pu239 (d) low enriched uranium

29. The binding energy of 26Fe56 nucleus is

(a) 8.8 MeV (b) 88 MeV (c) 493 MeV (d) 41.3 MeV

30. The half-life period of a certain radioactive element with disintegration constant 0.0693 per day is

(a) 10 days (b) 14 days (c) 140 days (d) 1.4 days

PART – II 15 x 3 = 45


31. Write the applications of capacitor.

32. What do you mean by “Additive nature of charges” ? Give an example.


34. The resistance of a Nichrome wire at 0°C is 10Ω. If its temperature co-efficient of resistance is 0.004/°C.

Find its resistance at boiling point of water.

35. Mention any three applications of superconductors.

36. Calculate the resistance of the filament of a 100W, 220V electric bulb.

37. Why can a DC ammeter not read AC?


39. Distinguish between interference and diffraction fringes.

40. A light of wavelength 5890 A° falls normally on a thin air film. 6 dark fringes are seen between two points.


41. What is hologram?

42. Write down the two important facts of the Laue experiment on X-ray diffraction.

43. State the postulates of special theory of relativity.

44. The half-life of 84Po218 is 3 minutes. What percentage of sample has decayed in 15 minutes?

45. What is the use of control rod in the reactor? Mention any two control rods.


47. Give the Barkhausen criteria for oscillation.

48. Give the important parameters of an operational amplifier.

49. The outputs of two NOT gates are NORed as shown in the figure. What is the logic operation

performed?

A

Y

B

50. What is the necessity of modulation?

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PART – III 7 x 5 = 35




51. Write the properties of electric lines of force.

52. Explain the principle of potentiometer.

53. Explain the action of lead-acid accumulator.

54. A long straight wire carrying current produces a magnetic induction of 4 x 10–6 T at a point 15 cm from the

wire. Calculate the current through the wire.

55. Explain how an e.m.f. can be induced by changing the area enclosed by the coil.

56. A soap film of refractive index 1.34, is illuminated by white light incident at an angle 30°. The reflected light is

examined by a spectroscope in which dark band corresponding to the wavelength 5893A° is found. Calculate

the smallest thickness of the film. [OR]

In Young’s experiment a light of frequency 6x1014 Hz is used. Distance between the centres of adjacent

fringes is 0.75 mm. Calculate the distance between the slits, if the screen is 1.5 m away.

57. Prove that the energy of an electron for hydrogen atom in the nth orbit is En = 222

o

4

hn8

me

.

58. Explain the wave mechanical concept of atom.

59. How fast would a rocket have to go relative to an observer for its length to be corrected to 99% of its length

at rest?

60. Explain the latitude effect of cosmic rays.

61. Explain the function of a transistor as a switch.

62. Draw the block diagram of AM radio transmitter.

PART – IV 4 x 10 = 40



63. Deduce an expression each for the equivalent capacitance of capacitors connected in (i) series and

(ii) parallel.

64. Deduce the relation for the magnetic induction at a point along the axis of a circular coil carrying current.

65. Describe the principle, construction and working of a single phase AC generator.


67. Explain the working of Ruby laser with neat sketch.

68. Explain the construction and working of a Geiger-Muller counter.

69. Explain the action of an operational amplifier as a difference amplifier.

70. With the help of block diagram, explain the function of a RADAR system.

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PART – I 30 x 1 = 30




1. Joule’s law of heating is

(a) H = R

I2t (b) H = V2Rt (c) H = IR2t (d) H = VIt

2. Fuse wire is an alloy of

(a) Lead and Tin (b) Tin and Copper (c) Lead and Copper (d) Lead and Iron



4. Lenz’s law is in accordance with the law of

(a) conservation of charges (b) conservation of flux

(c) conservation of momentum (d) conservation of energy

5. In a transformer, eddy current loss is minimized by using

(a) laminated core made of Mumetal (b) laminated core made of stelloy

(c) shell type core (d) thick copper wires

6. The ratio of the radii of the first three Bohr orbits is

(a) 1 : 1/2 : 1/3 (b) 1 : 2 : 3 (c) 1 : 4 : 9 (d) 1 : 8 : 27

7. The first excitation potential energy or the minimum energy required to excite the atom from ground state of

hydrogen atom is

(a) 13.6 eV (b) 10.2 eV (c) 3.4 eV (d) 1.89 eV

8. In hydrogen atom, which of the following transition produces a spectral line of maximum wavelength?

(a) 2 1 (b) 4 1 (c) 6 5 (d) 5 2

9. If the minimum wavelength of X-rays produced from a Coolidge tube is 0.062nm, then the potential

difference between the cathode and target material is

(a) 2000V (b) 20,000V (c) 2 x 105 V (d) 6.2 x 103 V

10. The work function of a photo-electric material is 3.3 eV. The threshold frequency will be equal to


11. The forbidden energy gap of silicon is of the order of

(a) 0.1 eV (b) 0.3 eV (c) 0.7 eV (d) 1.1 eV

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12. An oscillator is

(a) an amplifier with feedback (b) a converter of a.c to d.c energy

(c) nothing but an amplifier (d) an amplifier without feedback

13. Of the following, the donor atoms are

(a) silicon and germanium (b) aluminium and gallium

(c) bismuth and arsenic (d) boron and indium

14. The audio frequency range is

(a) 20 Hz to 200000 Hz (b) 20 Hz to 2000 Hz (c) 20 Hz to 2000000 Hz (d) 20 Hz to 20000 Hz

15. Printed documents to be transmitted by fax are converted into electrical signals by the process of

(a) reflection (b) scanning (c) modulation (d) light variation

16. The unit of permittivity is

(a) C2N–1m–2 (b) Nm2C–2 (c) Hm–1 (d) NC–2m–2

17. The work done in moving 500μC charge between two points on equipotential surface is

(a) zero (b) finite positive (c) finite negative (d) infinite

18. An electric dipole placed at an angle in a non-uniform electric field experiences

(a) neither a force nor a torque (b) torque only

(c) both force and torque (d) force only

19. A capacitor of capacitance 6μF is connected to a 100V battery. The energy stored in the capacitor is

(a) 30 J (b) 3 J (c) 0.03 J (d) 0.06 J

20. In the case of insulators, as the temperature decreases, the resistivity

(a) decreases (b) increases (c) remains constant (d) becomes zero

21. A power of 11,000 W is transmitted at 220 V. The current through line wires is

(a) 50 A (b) 5 A (c) 500 A (d) 0.5 A

22. Which of the following gives rise to continuous emission spectrum?

(a) Electric filament lamp (b) Sodium vapour lamp

(c) Gases in the discharge tube (d) Calcium salt in bunsen flame

23. When a drop of water is introduced between the glass plate and plano-convex lens in Newton’s rings system,

the ring system



24. A light of wavelength 6000 A° is incident normally on a grating 0.005m wide with 2500 lines. Then the

maximum order is

(a) 3 (b) 2 (c) 1 (d) 4

25. The transverse nature of light waves is demonstrated only by the phenomenon of

(a) interference (b) diffraction (c) polarization (d) reflection

26. The particle which has zero mass but has energy is

(a) electron (b) photon (c) proton (d) neutron

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27. The nuclei 13 Al 27 and 14 Si 28 are examples of


28. The mean life () and half-life (T1/2) of a radioactive element are related as

(a) = 2 T1/2 (b) = 6931.0

T 2/1 (c) = 0.6931 T1/2 (d) = 2

T 2/1

29. A radioactive element ZXA after emitting three –particles and four –particles is converted into an element Y

represented as

(a) Z – 6 Y A –12 (b) Z + 2 Y A – 12 (c) Z – 2 Y A – 12 (d) Z – 10 Y A – 12

30. Which of the following is used to detect the presence of blocks in blood vessels?

(a) 15P31 (b) 15P

32 (c) 26Fe59 (d) 11Na24

PART – II 15 x 3 = 45


31. Three capacitors each of capacitance 9pF are connected in series. What is the total capacitance of the

combination?

32. What is electrostatic shielding?

33. The resistance of a nichrome wire at 0°C is 10Ω. If its temperature of coefficient of resistance is 0.004/°C,

find its resistance at boiling point of water.

34. Define Mobility. Write its unit.

35. State Kirchoff’s (i) current law, (ii) voltage law.

36. Define ampere in terms of force between two long parallel current carrying conductors.

37. An aircraft having a wingspan of 20.48m flies due north at a speed of 40ms–1. If the vertical component of

earth’s magnetic field at the place is 2 x 10–5 T, calculate the e.m.f induced between the ends of the wings.

38. What is electromagnetic induction?

39. Two slits 0.3 mm apart are illuminated by light of wavelength 4500 A°. The screen is placed at 1 m distance

from the slits. Find the separation between the second bright fringe on both sides of the central maximum.

40. Define specific rotation.

41. State Moseley’s law. Write its equation.

42. Write any three medical applications of laser.

43. What are inertial and non-inertial frames?

44. Define curie.

45. Write any three properties of neutron.

46. Draw the circuit configuration of NPN transistor in common collector (CC) mode.


48. A transistor is connected in CE configuration. The voltage drop across the load resistance (Rc) 3k is 6V.

Find the base current. The current gain of the transistor is 0.97.

49. State de Morgan’s theorems.


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PART – III 7 x 5 = 35




51. Write the properties of electric lines of forces.

52. In Wheatstone bridge obtain the condition for bridge balance.

53. State Faraday’s second law of electrolysis. How is it verified experimentally?

54. Explain the conversion of a galvanometer into an ammeter.

55. Find the phase relation between current and voltage in an AC circuit containing a pure inductor. (Graph is

not necessary).

56. A parallel beam of monochromatic light is allowed to incident normally on a plane transmission grating

having 5000 lines per cm. A second order spectral line is found to be diffracted at an angle 30°. Calculate the

wavelength of the light.

57. An –particle is projected with an energy of 4 MeV directly towards a gold nucleus. Calculate the distance of

its closest approach. [Given: Atomic number of gold = 79 ; Atomic number of α-particle = 2]

58. Write any 5 applications of photoelectric cells.

59. Explain Lorentz-Fitzgerald contraction with an example.

60. Calculate the time required for 60% of a sample of radon to undergo decay.

(Given T1/2 of radon = 3.8 days) (OR)

Show that the mass of radium 88Ra226 with an activity of 1 curie is almost a gram.

(Given T1/2 of radium = 1600 years ; 1 curie = 3.7 x 1010 disintegrations per second)

61. Draw the frequency response curve of single stage CE amplifier and discuss the results.

62. What is an optical fibre? Mention the advantages of fibre optical communication system.

PART – IV 4 x 10 = 40



63. Derive an expression for electric potential at a point due to an electric dipole. Discuss the special cases.


65. Explain in detail the principle, construction and working of a single-phase AC generator.

66. What is Raman effect? Explain Raman spectrum with diagram.

67. Obtain the expression for the radius of nth orbit of an electron based on Bohr’s theory.

68. What are cosmic rays? Explain the latitude effect of cosmic rays.

69. Draw the circuit diagram of Colpitts oscillator and explain its working.

70. Explain the analysis of amplitude-modulated wave. Draw the plot of frequency spectrum.

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PART – I 30 x 1 = 30




1. Photon has

(a) energy but zero mass (b) mass but zero energy

(c) zero mass and zero energy (d) infinite mass and energy

2. If the nuclear radius is 2.6 x 10–15 m, the mass number will be

(a) 2 (b) 4 (c) 8 (d) 16

3. Slow neutrons are neutrons having energies between

(a) 1000 eV to 2000 eV (b) 2000 eV to 0.5 MeV (c) 0 eV to 1000 eV (d) 0.5 MeV to 10 MeV

4. In the nuclear reaction 80Hg198 + X 79Au198 + 1H1, X stands for

(a) proton (b) electron (c) neutron (d) deuteron


(a) 15P31 (b) 15P

32 (c) 11Na23 (d) 11Na24

6. The Q-factor (quality factor) of an AC circuit containing a resistance R, inductance L and capacitor C is

(a) LC

1Q (b)

L

C

R

1Q (c)

C

L

R

1Q (d)

LR

1Q

7. In an electromagnetic wave, the phase difference between E and magnetic field

B is

(a) /4 (b) /2 (c) (d) zero

8. If the velocity of light in a medium is 2.25 x 108 ms–1 then the refractive index of the medium will be

(a) 1.5 (b) 0.5 (c) 1.33 (d) 1.73


light?

(a) Diffraction pattern becomes narrower and crowded together (b) Bands disappear

(c) Diffraction pattern becomes broader and farther apart (d) No change

10. The polarizing angle for water is 53° 4’. If the light is incident at this angle on the surface of water, the angle

of refraction in water is

(a) 53° 4’ (b) 26° 30’ (c) 30° 4’ (d) 36° 56’

11. Which of the following quantities is scalar?

(a) Dipole moment (b) Electric force (c) Electric field (d) Electric potential

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(a) Vm (b) CN–1 (c) VC–1 (d) NC–1

13. When an electric dipole of dipole moment P is aligned parallel to the electric field E then the potential energy

of the dipole is given as

(a) PE (b) zero (c) –PE (d) PE / 2

14. The capacitance of a parallel plate capacitor increases from 5μF to 60μF when a dielectric is filled between

the plates. The dielectric constant of dielectric is

(a) 65 (b) 55 (c) 12 (d) 10

15. If the length of a copper wire has a certain resistance R, then on doubling the length its specific resistance

(a) will be doubled (b) will be ¼ th (c) will become 4 times (d) will remain the same

16. In common emitter (CE) amplifiers, the phase reversal between input and output voltages is

(a) 0° (b) 90° (c) 270° (d) 180°

17. In a Colpitts oscillator circuit

(a) capacitive feedback is used (b) tapped coil is used

(c) no tuned LC circuit is used (d) no capacitor is used


(a) AND (b) EXOR A

(c) OR (d) NAND Y B

19. The purpose of dividing each frame into two fields so as to transmit 50 views of the picture per second is

(a) to avoid unwanted noise into the signals (b) the fact that handling of higher frequencies is easier

(c) that 50 Hz is the power line frequency in India (d) to avoid flicker in the picture



21. The spectral series of Hydrogen atom in UV region are called

(a) Balmer series (b) Lyman series (c) Paschen series (d) Pfund series

22. The energy of a photon of characteristic X-ray from a Coolidge tube comes from

(a) the kinetic energy of free electrons of the target (b) the kinetic energy of ions of the target

(c) the kinetic energy of the striking electron (d) an atomic transition in the target

23. The chromium ions doped in the Ruby rod

(a) absorb red light (b) absorb green light (c) absorb blue light (d) emit green light

24. Maser Materials are

(a) diamagnetic ions (b) paramagnetic ions (c) ferromagnetic ions (d) non-magnetic ions

25. The wavelength of matter waves is independent of

(a) mass (b) velocity (c) momentum (d) charge

26. Nichrome is used as heating element, because it has

(a) low specific resistance (b) low melting point

(c) high specific resistance (d) high conductivity

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27. In a thermocouple, the temperature of the cold junction is 20°C, the neutral temperature is 270°C. Then the

temperature of inversion is

(a) 520°C (b) 540°C (c) 500°C (d) 510°C



29. Which of the following cannot be stepped up in a transformer?

(a) Input current (b) Input voltage (c) Input power (d) All of these

30. For a d.c. circuit, the value of capacitive reactance (Xc) is

(a) zero (b) infinity (c) /2 (d)

PART – II 15 x 3 = 45


31. Define electric flux. Give its unit.

32. Explain the working of microwave oven.

33. Define temperature coefficient of resistance.

34. Distinguish between electric power and electric energy.

35. An iron box of 400 W power is used daily for 30 minutes. If the cost per unit is 75 paise, find the weekly

expense on using the iron box.

36. Define ampere in terms of force.

37. Give the differences between AF choke and RF choke.

38. A capacitor of capacitance 2μF is in an AC circuit of frequency 1000 Hz. If the r.m.s value of the applied

e.m.f is 10 V, find the effective current flowing in the circuit.

39. On what factors does the amount of optical rotation depend?

40. A light of wavelength 6000 A° falls normally on a thin air film, 6 dark fringes are seen between two points.


41. What are the two important factors established by Laue experiment?

42. Write any three applications of laser in industry.

43. What is the de Broglie wavelength of electron of KE 120 eV? (h = 6.626 x 10–34Js ; m = 9.1 x 10–31 kg)

44. What are cosmic rays?

45. Write any three properties of nuclear force.

46. What is an integrated circuit?

47. What is an extrinsic semiconductor?


49. Find the output of the ideal operational amplifier shown in the figure for the input of Vin = 120 mV direct

current. 39 k

15k

Vin = 120 mV DC Vout

50. Define modulation factor.

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PART – III 7 x 5 = 35




51. Two positive charges 12 μC and 8 μC respectively are 10 cm apart. Find the work done in bringing them

4 cm closer, so that they are 6 cm apart.

52. Explain the determination of the internal resistance of a cell using voltmeter.

53. State Faraday’s first law of electrolysis and describe the experimental verification.

54. In a Hydrogen atom electron moves in an orbit of radius 0.5A° making 1016 revolutions per second.

Determine the magnetic moment associated with orbital motion of the electron. (Given e = 1.6 x 10–19C)

55. Explain the mutual induction between two long solenoids. Obtain an expression for the mutual inductance of

two long solenoids.

56. State and explain Brewster’s law.

57. State and obtain Bragg’s law.

58. What are the applications of Photoelectric cells?

59. Explain time dilation.

60. A reactor is developing energy at the rate of 32 MW. Calculate the required number of fissions per second of

92U235. Assume that energy per fission is 200 MeV. (OR)

Calculate the mass of coal required to produce the same energy as that produced by the fission of 1 kg of

92U235. [Given Heat of combustion of coal = 33.6 x 106J/kg ; 1 ton = 1000 kg ;

Energy per fission of 92U235 = 200 MeV ; 1 eV = 1.6 x 10–19 J ; Avagadro Number, N = 6.023 x 1023]

61. What is an AND gate? Explain the function of AND gate using electrical circuit and using diodes.

62. What are the advantages and disadvantages of Digital Communication?

PART – IV 4 x 10 = 40



63. What is an electric dipole? Derive an expression for electric potential due to an electric dipole.

64. Explain in detail the principle, construction and theory of a tangent galvanometer.

65. Discuss with theory the method of inducing e.m.f in a coil by changing its orientation with respect to the

direction of the magnetic field.

66. Discuss the theory of interference in thin transparent film due to reflected light and obtain condition for the

intensity to be maximum and minimum.

67. Explain Millikan’s oil drop experiment to determine the charge of an electron.

68. Discuss the principle and action of a Bainbridge mass spectrometer to determine the isotopic masses.

69. Explain with neat circuit diagram, the working of single stage CE amplifier.

70. With the help of bock diagram, explain the functions of various units in the monochrome television

transmitter.

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PART – I 30 x 1 = 30




1. A photon of frequency ‘’ is incident on a metal surface of threshold frequency o. The kinetic energy of the

emitted photoelectron is

(a) h( – o) (b) h (c) ho (d) h( + o)


(a) 10 days (b) 14 days (c) 1 day (d) 100 days

3. The radioactive isotope used in agriculture is

(a) 15P31 (b) 15P

32 (c) 11Na23 (d) 11Na24

4. One amu is equal to

(a) 931 eV (b) mass of carbon atom (c) 1.66 x 10-24 g (d) mass of electron

5. Particle that has no charge and no rest mass but travels with velocity of light is

(a) baryon (b) meson (c) lepton (d) photon

6. In a three phase AC generator the three coils are fastened rigidly together and are displaced from each other

by an angle

(a) 90 (b) 180 (c) 120 (d) 360

7. In an electromagnetic wave the phase difference between electric field E and the magnetic field

B is

(a) /4 (b) /2 (c) (d) zero

8. The refractive index of the medium, for the polarising angle 60 is

(a) 1.732 (b) 1.414 (c) 1.5 (d) 1.468

9. In Raman effect, if the scattered photon gains energy, it gives rise to

(a) Stoke’s line (b) anti-Stoke’s line

(c) Stoke’s and anti-Stoke’s lines (d) Rayleigh line

10. In case of Fraunhofer diffraction, the wavefront undergoing diffraction is

(a) spherical wavefront (b) cylindrical wavefront (c) elliptical wavefront (d) plane wavefront


(a) C2N–1m–2 (b) Nm2C–2 (c) Hm–1 (d) NC–2m–2

12. An electric dipole placed in a non-uniform electric field with its axis at an angle with the field experiences


(c) both a net force and a torque (d) neither a net force nor a torque

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13. An example of conductor is

(a) glass (b) human body (c) dry wood (d) ebonite

14. Quantisation of electric charge is given by

(a) q = ne (b) q = cv (c) q = e/n (d) q = c/v

15. When two 2 resistances are in parallel their effective resistance is

(a) 2 (b) 4 (c) 1 (d) 0.5

16. In common emitter transistor circuit, the base current (Ib) of the transistor is 50A and the collector current

(Ic) is 25mA. Then the current gain is

(a) 50 (b) 500 (c) 20 (d) 200

17. The colour of the light emitted by an LED depends on

(a) its reverse bias (b) the amount of forward current

(c) its forward bias (d) type of semi conductor material


A

C B

(a) AND gate (b) NAND gate (c) OR gate (d) NOR gate

19. Skip distance is the shortest distance between

(a) the point of transmission & the point of reception (b) the uplink station & the downlink station

(c) the transmitter & the target (d) the receiver & the target

20. Printed documents to be transmitted by FAX are converted into electrical signals by the process of


21. According to postulates of Bohr, which of the following quantities takes discrete values?

(a) Kinetic energy (b) Potential energy (c) Angular momentum (d) Momentum


(a) absorb red light (b) absorb green light (c) emit white light (d) emit green light

23. Number of waves per unit length is known as

(a) wavelength (b) wave number (c) bandwidth (d) frequency

24. A three dimensional image of an object can be formed by

(a) atomic spectroscopy (b) holography (c) MASER (d) molecular spectroscopy

25. The electron of mass m & charge e accelerated from rest through a potential V volt, then its final velocity is

(a) m

Ve(b)

m2

Ve(c)

m

Ve2(d)

m

Ve2

26. In a thermocouple, the temperature of the cold junction is 20oC, the neutral temperature is 270oC. The


(a) 520 oC (b) 540 oC (c) 500 oC (d) 510oC

27. Thermopile is used to

(a) measure temperature (b) measure current (c) measure pressure (d) detect thermal radiation

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28. A DC of 5A produces the same heating effect as an AC of

(a) 50A rms current (b) 5A peak current (c) 5A rms current (d) 5 2 A rms current


(a) transformer (b) filament bulb (c) AC generator (d) choke coil

30. In RLC series circuit, at resonance

(a) current is minimum (b) impedance is maximum

(c) circuit is purely inductive (d) current is in phase with the voltage

PART – II 15 x 3 = 45


31. What is corona discharge? 5F

32. Calculate the effective capacitance

of the combination in the figure. 10F 10F

33. Define drift velocity. A B

34. Distinguish between electromotive force and potential difference.

35. What are the applications of secondary cells?

36. What is neutral temperature of a thermocouple?

37. State Len’z law in electromagnetic induction.

38. An ideal transformer has transformation ratio 1 : 20. If the input power and primary voltage are 600 mW and

6 V respectively. Find the primary and secondary currents.

39. Write any three uses of infrared radiations.

40. Write the conditions for total internal reflection to take place.

41. Explain any one of the drawbacks of Rutherford atom model.

42. Calculate the longest wavelength that can be analysed by a rock salt crystal of spacing d = 2.82 Ao in the

first order.

43. Calculate the threshold wavelength of certain metal of work function 1.8 eV.

44. Define roentgen.

45. Define critical size and critical mass.

46. What is meant by doping?

47. Define output impedance of a transistor.

48. State the Barkhausen conditions for oscillations.

49. Find the output Y of the logic circuit given below:

A

B

Y

C

50. Mention any three advantages of Fibre Optic Communication System.

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PART – III 7 x 5 = 35




51. Two capacitors of unknown capacitances are connected in series and parallel. If the net capacitances in the

two combinations are 6 F and 25 F respectively, find their capacitances.

52. Explain the construction and working of Daniel cell.

53. Write any five applications of superconductors.

54. Explain in detail the principle & construction of a tangent galvanometer. (Diagram, theory not necessary)

55. Explain how an e.m.f can be induced by changing the area enclosed by the coil.

56. A soap film of refractive index 1.34, is illuminated by white light incident at an angle 30°. The reflected light is

examined by spectroscope in which dark band corresponding to the wavelength 5893 A° is found. Calculate

the smallest thickness of the film. (OR)

A monochromatic light of wavelength 5893 A° is incident on a water surface of refractive index 1.33. Find the

velocity, frequency and wavelength of light in water.

57. Write any five properties of cathode rays.

58. Explain the construction and working of a photo-emissive cell with diagram.

59. At what speed is a particle moving if the mass is equal to three times its rest mass?

60. Write a note on biological hazards of nuclear radiations.

61. Explain the circuit symbol and pin-out configuration of an operational amplifier.

62. Explain with the help of bock diagram, the function of FM radio transmitter.

PART – IV 4 x 10 = 40



63. State the principle and explain the construction and working of Van de Graff generator.

64. Deduce an expression for the force on a current carrying conductor placed in a magnetic field.

65. Obtain the phase relation between voltage and current in an AC circuit containing a pure inductance. Draw

the necessary graph.

66. State Huygen’s principle. On the basis of wave theory, prove the laws of reflection.

67. Describe Millikan’s oil drop experiment to determine the charge of an electron.

68. Obtain an expression for the amount of radioactive substance present at any moment. Obtain the relation

between half-life period and decay constant.

69. With the circuit diagram, explain the function of a CE transistor amplifier.

70. With the functional block diagram, explain the working of Monochrome TV transmitter.

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PART – I 30 x 1 = 30

N.B. : (i) Answer all the questions.




(a) 0.7 eV (b) 1.1 eV (c) 0.3 eV (d) 10 eV

2. According to the laws of Boolean algebra, the expression (A + AB) is equal to

(a) A (b) AB (c) B (d) A

3. An example for non–sinusoidal oscillator is

(a) Multivibrator (b) RC oscillator (c) Colpitts oscillator (d) Crystal oscillator



(c) low frequency carrier waves (d) both audio signal & high frequency carrier waves

5. An FM signal has a resting frequency of 105 MHz and highest frequency of 105.03 MHz, when modulated by

a signal. Then the carrier swing is

(a) 0.03 MHz (b) 0.06 MHz (c) 0.03 kHz (d) 60 MHz

6. According to special theory of relativity the only constant in all frames is

(a) mass (b) length (c) velocity of light (d) time

7. In β–decay,

(a) atomic number decreases by one (b) mass number decreases by one

(c) proton number remains the same (d) neutron number decreases by one

8. In the nuclear reaction 80Hg198 + X 79Au198 + 1H1, X stands for

(a) proton (b) electron (c) neutron (d) deuteron

9. The half–life of a radioactive element is 300 days. The disintegration constant of the radioactive element is

(a) 0.00231 day (b) 0.00231 / day (c) 0.0231 / day (d) 0.0231 day

10. The nuclear force is due to the continuous exchange of particles called

(a) leptons (b) hyperons (c) mesons (d) photons



12. The minimum wavelength of X–rays produced in an X–ray tube at 1000 kV is

(a) 0.0124 Ao (b) 0.124 Ao (c) 1.24 Ao (d) 0.00124 Ao

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13. In a discharge tube, the source of positive rays ( canal rays ) is

(a) cathode (b) anode

(c) gas atoms present in the discharge tube (d) fluorescent screen

14. The ionisation potential of hydrogen atom is

(a) 13.6 eV (b) –13.6 eV (c) 13.6 V (d) –13.6 V

15. At the threshold frequency, the velocity of the electrons is

(a) zero (b) minimum (c) maximum (d) infinite

16. In an A.C. circuit

(a) the average value of current is zero (b) the average value of square of current is zero

(c) the average power dissipation is zero (d) the rms current is 2 times of peak current

17. In an electromagnetic wave the phase difference between electric field E and magnetic field

B is

(a) /4 (b) /2 (c) (d) zero

18. A ray of light is incident on a glass surface such that the reflected ray is completely plane polarised. The

angle between the reflected ray and the refracted ray is

(a) 57.5° (b) 32.5° (c) 90° (d) 115°

19. Soap bubbles exhibit brilliant colours in sunlight due to

(a) scattering of light (b) diffraction of light (c) polarisation of light (d) interference of light

20. The radii of Newton’s dark rings are in the ratio

(a) 1: 2 : 3 : …… (b) 1 : 2 : 3 : …... (c) 1 : 3 : 5 : …... (d) 1 : 4 : 9 : ……

21. Of the following devices, which has small resistance?

(a) Voltmeter (b) Moving coil galvanometer

(c) Ammeter of range 0 – 1 A (d) Ammeter of range 0 – 10 A

22. The resistance of the filament of a 110 W, 220 V electric bulb is

(a) 440 Ω (b) 220 Ω (c) 484 Ω (d) 848 Ω

23. The self-inductance of a straight conductor is


24. A DC ( direct current ) of 5A produces the same heating effect as an AC ( alternating current ) of

(a) 50 A rms current (b) 5 A peak current (c) 15 A rms current (d) none of these

25. Q–factor of a series resonant circuit

(a) Q = C

R

L

1(b) Q =

C

L

R

1(c) Q =

L

C

R

1(d) Q =

R

L

C

1




(a) NC (b) NC–1 (c) Vm (d) NC–2

28. The magnitude of the force acting on a charge of 2 x 10–10 C placed in a uniform electric field of 10 Vm–1 is

(a) 2 x 10–9 N (b) 4 x 10–9 N (c) 2 x 10–10 N (d) 4 x 10–10 N

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29. Electric potential energy (U) of two point charges is

(a) 2

o

21

r4

qq

(b)

r4

qq

o

21

(c) PE cos θ (d) PE sin θ

30. In the case of insulators, as the temperature decreases, resistivity


PART – II 15 x 3 = 45


31. State Gauss’ law.

32. What is a capacitor? Define its capacitance.

33. Two wires of same material and length have resistances 5Ω and 10 Ω respectively. Find the ratio of radii of

the two wires.

34. State Kirchoff’s second law for electrical network.

35. Define mobility of electrons. Give its unit.

36. State Ampere’s circuital law.

37. Calculate the mutual inductance between two coils when a current of 4 A changing to 8 A in 0.5 s in one coil,

induces an e.m.f. of 50 mV in the other coil.


39. A 300 mm long tube containing 60 c.c. of sugar solution produces a rotation of 9° when placed in a

polarimeter. If the specific rotation is 60°, calculate the quantity of sugar contained in the solution.

40. Why is the centre of the Newton’s ring dark?

41. Calculate the longest wavelength of X–rays that can be analysed by a rock salt crystal of spacing

d = 2.82 A° in the first order.



44. What is meant by breeder reactor?

45. Mention any three properties of nuclear force.

46. Give the Boolean equation for the given logic diagram :

A B

F

A

C

47. Draw the circuit for summing amplifier.


49. State de Morgan’s theorems.

50. Mention the advantages of frequency modulation.

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51. Define electric potential at a point. Obtain an expression for electric potential due to a point charge.

52. A copper wire of 10–6 m2 area of cross-section, carries a current of 2 A. If the number of electrons per cubic

metre is 8 x 1028, calculate the current density and average drift velocity. (Given e = 1.6 x 10–19 C).

53. Mention any five applications of superconductors.

54. A moving coil galvanometer of resistance 20 Ω produces full-scale deflection for a current of 50 mA. How will

you convert the galvanometer into (i) an ammeter of range 20 A and (ii) a voltmeter of range 120 V?

(OR)

A circular coil of radius 20 cm has 100 turns of wire and it carries a current of 5 A. Find the magnetic


55. Explain how an e.m.f can be induced by changing the area enclosed by the coil in a uniform magnetic field.


57. Explain the origin of characteristic X–rays.

58. What is photoelectric effect? State the laws of photoelectric emission.

59. Derive an expression for the de Broglie wavelength of matter waves.

60. The binding energy per nucleon for 6C12 nucleus is 7.68 MeV and that for 6C

13 is 7.47 MeV. Calculate the

energy required to remove a neutron from 6C13 nucleus.

61. Explain the working of a half wave diode rectifier.

62. With the help of block diagram, explain the operation of an FM superheterodyne receiver.

PART – IV 4 x 10 = 40




axial line.

64. Deduce an expression for the force on a current carrying conductor placed in a magnetic field. Find the

magnitude of the force.

65. What are eddy currents? Explain their applications. How are they minimised?


67. Draw a neat sketch of Ruby Laser. Explain its working with the help of energy level diagram.


69. What is meant by feedback? Derive an expression for voltage gain of an amplifier with negative feedback.


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1. Einstein’s photoelectric equation is

(a) W + h = 2

1m 2

maxv (b) 2

1m 2

maxv = W (c) h + 2

1m 2

maxv = W (d) W + 2

1m 2

maxv = h

2. The explosion of atom bomb is based on the principle of ___________ reaction.

(a) uncontrolled fission (b) controlled fission (c) fusion (d) thermonuclear


(a) 15P31 (b) 15P

32 (c) 26Fe59 (d) 11Na24

4. The mean life of radon is 5.5 days. Its half-life is

(a) 8 days (b) 2.8 days (c) 0.38 days (d) 3.8 days

5. The energy equivalent of 1 amu is

(a) 931 MeV (b) 931 meV (c) 931 eV (d) 913 MeV

6. The angle between the area vector A and the plane of the area A is

(a) /2 (b) (c) 2 (d) zero

7. In an electromagnetic wave

(a) power is equally transferred along the electric and magnetic fields

(b) power is transmitted in a direction perpendicular to both the fields

(c) power is transmitted along electric field

(d) power is transmitted along magnetic field

8. In the grating formula sin θ = Nmλ, the unit of N is

(a) metre (b) metre-1 (c) no unit (d) (metre)2

9. If the wavelength of the light is reduced to one fourth, then the amount of scattering is

(a) increased by 16 times (b) decreased by 16 times

(c) increased by 256 times (d) decreased by 256 times

10. The ratio of the radii of the 4th and 9th dark rings in Newton’s rings experiment is

(a) 4 : 9 (b) 2 : 3 (c) 16 : 81 (d) 2 : 3

11. The torque () experienced by an electric dipole placed in a uniform electric field (E) at an angle θ with the

field is

(a) PE cosθ (b) – PE cosθ (c) PE sinθ (d) 2 PE sinθ

12. The unit of electric flux is

(a) C2N-1m2 (b) Nm2C-1 (c) C2N-1m-2 (d) NC-1m-2

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13. The capacitance of a parallel plate capacitor increases from 5μF to 50μF when a dielectric is filled between

the plates. The permittivity of the dielectric is

(a) 8.854 x 10-12 C2N–1m–2 (b) 8.854 x 10-11 C2N–1m–2 (c) 12 (d) 10

14. The negative gradient of potential is

(a) electric force (b) torque (c) electric current (d) electric field intensity

15. The transition temperature of mercury is

(a) 4.2˚C (b) 4.2 K (c) 2.4˚C (d) 2.4 K


(a) an amplifier with feedback (b) a converter of AC to DC energy


17. The reverse saturation current in a PN junction diode is only due to

(a) minority carriers (b) majority carriers (c) acceptor ions (d) donor ions

18. If the output (Y) of the following circuit is 1, the inputs A B C must be

A

B

Y

C(a) 0 1 0 (b) 1 0 0 (c) 1 0 1 (d) 1 1 0

19. Printed documents to be transmitted by fax are converted into electric signals by the process of


20. In the AM superheterodyne receiver system the value of the intermediate frequency is equal to


21. X-ray is

(a) phenomenon of conversion of kinetic energy into radiation

(b) conversion of momentum

(c) conversion of energy into mass

(d) principle of conservation of charge

22. The value of Rydberg’s constant is

(a) 1.094 x 10-7 m (b) 1.094 x 10-7 m-1 (c) 1.094 x 107 m-1 (d) 1.094 x 107 m

23. When an electric field is applied to an atom each of the spectral lines split into several lines. This effect is

known as

(a) Zeeman effect (b) Stark effect (c) Raman effect (d) Seebeck effect

24. A Coolidge tube operates at 24800V. The minimum wavelength of X-ray radiation emitted from Coolidge

tube is

(a) 6 x 1018 m (b) 3 x 1018 m (c) 0.6 x 10-10 m (d) 0.5 x 10-10 m

25. According to theory of relativity the length of a rod in motion





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26. Peltier coefficient at a junction of a thermocouple depends on

(a) the current in the thermocouple

(b) the time for which current flows

(c) the temperature of the junction

(d) the charge that passes through the thermocouple

27. The magnitude and direction of the magnetic Lorentz force is given by

(a)

BxvF (b)

Bxv

qF (c)

BxvqF (d)

BxqvF

28. Which of the following devices does not allow direct current (DC) to pass through?

(a) Capacitor (b) Inductor (c) Resistor (d) All of these

29. Electromagnetic Induction is not used in

(a) transformer (b) room heater (c) choke coil (d) A.C generator

30. A coil of area of cross-section 0.5 m2 with 10 turns is in a plane, which is perpendicular to a uniform magnetic

field of 0.2 wb/m2. The magnetic flux through the coil is

(a) 100 wb (b) 10 wb (c) 1 wb (d) zero

PART – II 15 x 3 = 45


31. Define electric potential at a point.


33. The resistance of a nichrome wire at 0°C is 10Ω. If its temperature co-efficient of resistance is 0.004/°C, find




36. How is a galvanometer converted into (a) an ammeter (b) a voltmeter?

37. Define coefficient of self induction.

38. Calculate the capacitive reactance of a capacitor of capacitance 2F in an A.C. circuit of frequency 1000 Hz.


40. A light of wavelength 6000 Ao falls normally on a thin air film. 6 dark fringes are seen between two points.


41. What are the characteristics of Laser?

42. Define ionization potential energy.


44. The radioactive isotope 84Po214 undergoes a successive disintegration of two -decays and two -decays.

Find the atomic number and mass number of the resulting isotope.

45. How do you classify neutrons in terms of its kinetic energy? 5 k

46. What is an integrated circuit? V1 10 k

47. Find the output of the given circuit: Vo

V2 10 k

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48. Give the Barkhausen conditions for oscillator.

49. Mention any three uses of Cathode Ray Oscilloscope (CRO).


PART – III 7 x 5 = 35




51. The plates of a parallel plate capacitor have an area of 90 cm2 each and are separated by 2.5 mm. The

capacitor is charged by connecting it to a 400 V supply. How much electrostatic energy is stored by the

capacitor?


53. Explain the working of a Daniel cell with a diagram.

54. State and explain Biot-Savart law.

55. An AC generator consists of a coil of 10,000 turns and of area 100 cm2. The coil rotates at an angular speed

of 140 r.p.m. in a uniform magnetic field of 3.6 x 10-2 T. Find the maximum value of the e.m.f induced.

56. Write a note on pile of plates.


58. The time interval measured by an observer at rest is 2.5 x 10-8 s. What is the time interval as measured by

an observer moving with a velocity v = 0.73c? (OR)

The work function of iron is 4.7 eV. Calculate the cut-off frequency and the corresponding cut-off wavelength

for this metal.


60. Explain the latitude effect of cosmic rays.

61. Explain how transistor biasing is provided by voltage divider bias method.

62. Mention the merits and demerits of digital communication.

PART – IV 4 x 10 = 40



63. Derive an expression for electric field due to an electric dipole at a point along the equatorial line.

64. Define Ampere’s circuital law. Applying it find the magnetic induction due to a long solenoid carrying current.

65. A sources of alternating e.m.f is connected to a series combination of a resistor R, an inductor L and a

capacitor C. Obtain with the help of a vector diagram and impedance diagram, an expression for (i) the

effective voltage, (ii) the impedance, (iii) the phase relationship between the current and the voltage.

66. Explain emission and absorption spectra.

67. State the postulates of Bohr atom model. Obtain an expression for the radius of nth orbit of an electron of

hydrogen atom based on Bohr’s theory.

68. Explain the principle, construction and working of a Geiger-Muller counter.

69. Sketch the circuit of Colpitts oscillator. Explain its working.

70. Explain the construction and working of a vidicon camera tube with neat diagram.

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PART – I 30 x 1 = 30





(a) zero (b) maximum (c) minimum (d) infinite

2. In β-decay



3. The fuel used in Kamini (Kalpakkam mini reactor) is

(a) mixture of carbides of uranium and plutonium (b) mixture of oxides of plutonium and uranium

(c) 92U233 (d) 92U

235

4. The nuclear force existing between any two nucleons is due to the continuous exchange of particles called

(a) leptons (b) mesons (c) hyperons (d) photons

5. The radioisotope used in agriculture is

(a) 15P32 (b) 11Na23 (c) 15P

31 (d) 11Na24

6. In LCR series circuit, at resonance

(a) impedance (Z) is maximum (b) current is minimum

(c) impedance (Z) is equal to R (d) o = LC

1

7. Electromagnetic waves are

(a) transverse (b) longitudinal

(c) may be longitudinal or transverse (d) neither longitudinal nor transverse

8. In Newton’s ring experiment, the radii of mth and (m + 4)th dark rings are respectively 5 mm and 7 mm.

What is the value of m?

(a) 2 (b) 4 (c) 8 (d) 10

9. Atomic spectrum should be

(a) pure line spectrum (b) emission band spectrum

(c) absorption line spectrum (d) absorption band spectrum

10. Which of the following is not an optically active material?

(a) Quartz (b) Sugar crystals (c) Turpentine oil (d) Calcium chloride

11. Torque on a dipole in a uniform electric field is maximum when angle betweenP and

E is

(a) 0° (b) 90° (c) 45° (d) 180°

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12. When a point charge of 6C is moved between two points in an electric field, the work done is 1.8 x 10–5 J.

The potential difference between the two points is

(a) 1.08 V (b) 1.08 V (c) 3 V (d) 30 V

13. The electric field outside the plates of two oppositely charged plane sheets of charge density σ is

(a) o2

(b)

o2

(c) o

(d) zero

14. The equivalent capacitance of two capacitors connected in series is 1.5 F. The capacitance of one of them

is 4 F. The capacitance of the other is

(a) 2.4 F (b) 2 F (c) 4 F (d) 6 F

15. If the length of a copper wire has a certain resistance R, then on doubling the length, its specific resistance

(a) will be doubled (b) will be one fourth (c) will become 4 times (d) will remain the same

16. The Boolean expression to represent NAND operation is

(a) Y = A + B (b) Y = A . B (c) Y = A (d) Y = AB

17. In single stage CE amplifier, the voltage gain at mid-frequency is 10. The voltage gain at upper cut-off

frequency is

(a) 10 (b) 10.1 (c) 7.07 (d) 14.14

18. Barkhausen condition for maintenance of oscillations in oscillator is

(a) = A

1(b) A = α (c) A = (d) A =

2

1


(a) horizontal deflector plates (b) vertical deflector plates

(c) control grid (d) filament

20. Digital signals are converted into analog signals using

(a) fax (b) modem (c) cable (d) co-axial cable

21. In hydrogen atom, which of the following transitions produces a spectral line of maximum wavelength?

(a) 2 1 (b) 4 1 (c) 6 5 (d) 5 2



23. In holography, which of the following is (are) recorded on the photographic film?

(a) frequency & amplitude (b) phase & frequency (c) phase & amplitude (d) frequency only

24. The direction of viscous force in Millikan’s oil drop experiment is

(a) always downwards (b) always upwards

(c) opposite to the direction of motion of the oil drop (d) either upwards or downwards

25. The wavelength of matter waves is independent of


26. Phosphor-bronze wire is used for suspension in a moving coil galvanometer, because it has

(a) high conductivity (b) high resistivity

(c) large couple per unit twist (d) small couple per unit twist

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27. Unit of Peltier coefficient is

(a) ohm (b) mho (c) volt (d) ampere

28. An e.m.f of 12V is induced when the current in the coil changes at the rate of 40 As-1. The coefficient of

self-induction of the coil is

(a) 0.3 H (b) 0.003 H (c) 30 H (d) 4.8 H


(a) Input current (b) Input voltage (c) Input power (d) All of these

30. The core used in audio frequency chokes is

(a) iron (b) carbon (c) lead (d) air

PART – II 15 x 3 = 45


31. What is an electric dipole? Define electric dipole moment.

32. What is meant by dielectric polarization?

33. In the given circuit, what are the total resistance and current supplied by the battery?

2 6V

3 3 3



36. How can we increase the current sensitivity of a galvanometer?


38. What is meant by r.m.s (effective) value of alternating current?

39. The refractive index of a medium is 3 . Calculate the angle of refraction if the unpolarised light is incident

on it at the polarizing angle of the medium.

40. State Huygen’s principle.

41. Calculate the short wavelength limit of Lyman series. (R = 1.097 x 107 m-1)

42. What are the applications of laser in medical field?

43. Define stopping potential.

44. What is binding energy of nucleus?

45. The half-life of Radon is 3.8 days. Calculate its mean life.

46. Write the different methods of doping a semiconductor.

47. What is a Zener diode? Draw its symbol.

48. Define output impedance of a transistor.

49. When negative feedback is applied to an amplifier of gain 50, the gain after feedback falls to 25. Calculate

the feedback ratio.


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PART – III 7 x 5 = 35




51. What is electrostatic potential energy of a system of two point charges? Deduce an expression for it.


53. State Faraday’s first law of electrolysis. How is it verified experimentally?

54. Two parallel wires each of length 5 m are placed at a distance of 10 cm apart in air. They carry equal

currents along the same direction and experience a mutually attractive force of 3.6 x 10–4 N. Find the current

through the conductors. (OR)

A rectangular coil of 500 turns and of area 6 x 10–4 m2 is suspended inside a radial magnetic field of

induction 10–4 T by a suspension wire of torsional constant 5 x 10–10 Nm per degree. Calculate the current

required to produce a deflection of 10°.

55. Explain the various energy losses in a transformer. How are they minimized?


57. Obtain Bragg’s law.


59. A metallic surface when illuminated with the light of wavelength 3333 Ao emits electrons with energies upto

0.6 eV. Calculate the work function of the metal.


92U235. Assume that energy per fission is 200 MeV.

61. State and prove de Morgan’s theorem.

62. Explain the function of FM transmitter with a neat block diagram.

PART – IV 4 x 10 = 40



63. State the principle and explain the construction and working of Van de Graff generator.

64. Obtain an expression for the magnetic induction at a point due to an infinitely long straight conductor carrying

current.

65. Discuss with theory the method of inducing emf in a coil by changing its orientation with respect to the


66. Explain the theory of interference in thin transparent film due to reflected light and obtain the condition for the

intensity to be maximum and minimum.

67. Describe the J.J.Thomson method for determining the specific charge of electron.

68. Write the radioactive law of disintegration. Obtain an expression to deduce the amount of radioactive

substance present at any moment. Obtain the relation between half-life period and decay constant.

69. What is an operational amplifier? Explain its action as (i) inverting amplifier (ii) non-inverting amplifier.

70. Explain the functions of various units in the monochrome television transmission with suitable block diagram.

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1. Which of the following equations represents Biot-Savart law?

(a) 2

o

r

dlI

4dB

(b) 2

o

r

sindlI

4dB

(c)

2o

r

rxdlI

4dB

(d) 3

o

r

rxdlI

4dB

2. In a thermocouple, the temperature of the cold junction is 20oC, the neutral temperature is 270oC, the


(a) 520oC (b) 540oC (c) 500oC (d) 510oC

3. A coil of area of cross-section 0.5 m2 with 10 turns is in a plane which is parallel to a uniform magnetic

field of 0.2 Wb/m2. The flux through the coil is

(a) 100 Wb (b) 10 Wb (c) 1 Wb (d) zero

4. Which of the following devices does not allow DC to pass through?

(a) Resistor (b) Capacitor (c) Inductor (d) All of these

5. The part of the AC generator that passes the current from the coil to the external circuit is

(a) field magnet (b) split rings (c) slip-rings (d) brushes

6. In hydrogen atom the ratio of the radii of the first three Bohr orbits is

(a) 1 : 1/2 : 1/3 (b) 1 : 2 : 3 (c) 1 : 4 : 9 (d) 1 : 8 : 27

7. In Sommerfeld atom model, for principal quantum number n = 3, which of the following subshells

represents circular orbit?

(a) 3s (b) 3p (c) 3d (d) none of these

8. X-ray is

(a) conversion of momentum (b) phenomenon of conversion of KE into radiation

(c) conversion of energy into mass (d) principle of conversion of charge



10. The photoelectric effect can be explained on the basis of _____________ of light.

(a) corpuscular theory (b) wave theory (c) quantum theory (d) electromagnetic theory

11. In the pin configuration of IC 741, pin 3 represents

(a) inverting input (b) non-inverting input (c) – Vcc (d) output

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13. The forbidden energy gap for conductors is

(a) 0.7 eV (b) 1.1 eV (c) zero (d) 3 eV

14. The principle used for the transmission of light signals through the optical fibre is

(a) polarisation (b) refraction (c) diffraction (d) total internal reflection



(c) both audio signal and HF carrier waves (d) low frequency carrier waves

16. A hollow metal ball carrying an electric charge produces no electric filed at points

(a) outside the sphere (b) on its surface

(c) inside the sphere (d) at a distance more than twice its radius

17. The work done in moving 500 C charge between two points on equipotential surface is


18. Three capacitors of capacitances 1 F, 2 F & 3 F are connected in series. The effective capacitance

of the capacitors is

(a) 6 F (b) 11/6 F (c) 6/11F (d) 1/6 F

19. An electric dipole of moment p is placed in a uniform electric field of intensity E at an angle with

respect to the field. The direction of the torque is

(a) along the direction of p (b) opposite to the direction of p

(c) along the direction of E (d) perpendicular to the plane containing p and E

20. If the length of a copper wire has a certain resistance R, then on doubling the length its specific

resistance

(a) will be doubled (b) will become 1/4th (c) will become 4 times (d) will remain the same

21. The r.m.s value of the alternating current (AC) flowing through a resistor is 5A. Its peak value is

(a) 3.536 A (b) 70.7 A (c) 7.07 A (d) 7 A

22. If the wavelength of the light is reduced to one fourth, then the amount of scattering is

(a) increased by 16 times (b) decreased by 16 times

(c) increased by 256 times (d) decreased by 256 times

23. The refractive index of the medium for the polarizing angle 60˚ is

(a) 1.732 (b) 1.414 (c) 1.5 (d) 1.468

24. In Raman effect, the incident photon makes collision with an excited molecule of the substance. The

scattered photon gives rise to

(a) Stokes’ line (b) Anti-Stokes’ line (c) Rayleigh line (d) Zeeman line

25. The refractive index of glass is 1.5. The velocity of light in glass is

(a) 2 x 108 ms–1 (b) 4.5 x 108 ms–1 (c) 3 x 108 ms–1 (d) 1.33 x 108 ms–1

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26. Electron microscope works on the principle of

(a) photoelectric effect (b) particle nature of electron

(c) wave nature of moving electron (d) dual nature of matter

27. The explosion of atom bomb is based on the principle of

(a) uncontrolled nuclear fission reaction (b) controlled nuclear fission reaction

(c) nuclear fusion reaction (d) thermonuclear reaction


(a) 15P31 (b) 15P

32 (c) 26Fe59 (d) 11Na24

29. In the nuclear reaction 4Be9 + X → 6C12 + 0n

1, X stands for

(a) proton (b) -particle (c) electron (d) deuteron

30. Which of the following belongs to Baryon group?

(a) photon (b) electron (c) pion (d) proton

PART – II 15 x 3 = 45

Note : Answer any fifteen questions





35. If 6.25 x 1018 electrons flow through a given cross-section of a conductor in unit time, find the current.

36. What are the characteristics of heating element used in electric heating device?

37. An emf of 5 V is induced when the current in the coil changes at the rate of 100 As–1. Find the

coefficient of self–induction of the coil.



40. Distinguish between Fresnel and Fraunhofer diffractions.

41. What are the characteristics of LASER?

42. Find the minimum wavelength of X-rays produced by an X-ray tube operating at 1000 kV.

43. Write any three applications of photoelectric cells.

44. Tritium has a half-life of 12.5 years. What fraction of the sample will be left over after 25 years?

45. Define Curie.

46. Draw energy band diagrams of N-type semiconductor and P-type semiconductor.

47. What is the Boolean expression for the logic diagram shown in figure? Evaluate its output if A = 1,

B = 1 and C = 1.

A

B

Y

C

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48. When negative feedback is applied to an amplifier of gain 50, the gain after feedback falls to 25.

Calculate the feedback ratio.

49. Give the Barkhausen condition for oscillations.


PART – III 7 x 5 = 35





52. Derive the condition for balancing of Wheatstone’s bridge.

53. The effective resistances are 10 Ω and 2.4 Ω when two resistors are connected in series and in

parallel. What are the resistances of individual resistors?

54. Explain how you will convert a galvanometer into a voltmeter.

55. Explain any two applications of eddy current.


having 5000 lines per centimetre. A second order spectral line is found to be diffracted at an angle 30˚.

Find the wavelength of the light. [OR]

In a Newton’s rings experiment the diameter of the 20th dark ring was found to be 5.82 mm & that of the

10th ring 3.36 mm. If the radius of the plano-convex lens is 1 m, calculate the wavelength of light used.

57. Explain the spectral series of hydrogen atom. (Diagram not necessary)


59. Explain length contraction on the basis of special theory of relativity.

60. The disintegration constant of a radioactive element is 0.00231 per day. Calculate its half-life and

mean life.

61. State and prove De Morgan’s theorems.

62. State the principle of Radar. What are the applications of Radar?

PART – IV 4 x 10 = 40



63. Derive an expression for electric potential at a point due to an electric dipole. Explain the special cases.

64. Obtain an expression for the magnetic induction at a point due to an infinitely long straight conductor

carrying current.




67. Describe the J.J.Thomson method for determining the specific charge (e/m) of an electron.

68. What are cosmic rays? Explain (i) latitude effect (ii) altitude effect of cosmic rays.

69. What is rectification? Explain the working of bridge rectifier with diagram. Draw input & output signals.

70. Explain the functional block diagram of a monochrome TV receiver.

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1. The photoelectric effect can be explained by on the basis of ___________ of light.

(a) corpuscular theory (b) wave theory (c) quantum theory (d) electromagnetic theory

2. The ionisation power is maximum for

(a) neutrons (b) -particles (c) -rays (d) -particles

3. The explosion of an atom bomb is based on the principle of ____________ reaction.

(a) uncontrolled fission (b) controlled fission (c) fusion reaction (d) thermonuclear



5. According to the law of disintegration N = No e–t, the number of radioactive atoms that have been decayed

during a time of t is

(a) No (b) N (c) No – N (d) No / 2

6. In an AC circuit average power consumed is 200 W and the apparent power is 300 W. The power factor is

(a) 1.5 (b) 0.66 (c) 0.33 (d) 1

7. In an electromagnetic wave the phase difference between electric fieldE and magnetic field

B is

(a) /4 (b) /2 (c) (d) zero

8. When a drop of water is introduced between the glass plate and planoconvex lens in Newton’s ring system,

the ring system



9. In the grating formula sin = Nm, the unit of N is

(a) metre (b) metre–1 (c) no unit (d) (metre)2

10. The transverse nature of light waves is demonstrated only by the phenomenon of

(a) interference (b) diffraction (c) polarisation (d) reflection

11. The electric field intensity at a distance r due to infinitely long straight charged wire is directly proportional to

(a) r (b) 1/r (c) r 2 (d) 1/r2



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(a) 2

o

21

r4

qq

(b)

r4

qq

o

21

(c) pEcos (d) pEsin

14. The ratio of electric potential at points 10cm & 20cm from the centre of an electric dipole along its axial line is

(a) 1 : 2 (b) 2 : 1 (c) 1 : 4 (d) 4 : 1

15. A toaster operating at 240 V has a resistance of 120 . The power is

(a) 400 W (b) 2 W (c) 480 W (d) 240 W

16. The colour of light emitted by an LED depends on








19. Printed documents to be transmitted by a fax are converted into electrical signals by the process of


20. In an AM receiver, the local oscillator frequency is 2750 kHz. The tuned-in station frequency is


21. In Millikan’s experiment, the plates are kept at a distance of 16 mm and are maintained at a potential

difference of 10000 V. The electric intensity is

(a) 62.5 V/m (b) 6.25 x 10 5 V/m (c) 6.25 x 10 3 V/m (d) 1.6 x 10 5 V/m

22. If R is Rydberg constant, the shortest wavelength of Paschen series is

(a) R/9 (b) 9/R (c) 16/R (d) 25/R

23. e/m of cathode ray particle

(a) depends upon the nature of the cathode

(b) depends upon the nature of the anode

(c) depends upon the nature of the gas atoms present inside the discharge tube

(d) is independent of all these








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26. For a given thermocouple the neutral temperature

(a) depends upon the temperature of cold junction (b) depends upon the temperature of hot junction

(c) is a constant (d) depends upon the temperature of cold & hot junction


(a) zero resistance (b) finite resistance less than G but greater than zero





(a) AC only (b) DC only (c) both AC and DC (d) neither AC nor DC

30. The effective value of alternating current is

(a) Io / 2 (b) Io / 2 (c) Io 2 (d) 2 Io

PART – II 15 x 3 = 45


31. Mention any three properties of electric lines of force.


33. The resistance of a platinum wire at 0oC is 4 . What will be the resistance of the wire at 100oC if the

temperature coefficient of resistance of platinum is 0.0038 / oC?

34. What are the changes observed at transition temperature when the conductor becomes a superconductor?

35. State Faraday’s law of electrolysis.

36. What are the limitations of cyclotron?

37. An aircraft having a wingspan of 20.48 m flies due north at a speed of 40 ms–1. If the vertical component of

earth’s magnetic field at the place is 2 x 10–5 T, calculate the emf induced between the ends of the wings.

38. State Lenz’s law.

39. Define optic axis.




first order.

43. According to classical mechanics, what is the concept of time?

44. The half-life of radon is 3.8 days. Calculate its mean life.


46. State De Morgan’s theorems.

47. The base current of a transistor is 50 A and collector current is 25 mA. Find the value of current gain .

48. Mention any three advantages of IC (Integrated Circuit).

49. Draw NOT gate using transistor.


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PART – III 7 x 5 = 35



51. Deduce an expression for the capacitance of a parallel plate capacitor.

52. Three resistors are connected in series R1 = 5 R2 = 3 R3 = 2

with 10 V supply as shown in the figure. V1 V2 V3

Find the voltage drop across each resistor. I

(OR) 10 V

What is the drift velocity of an electron in a copper conductor having area 10 x 10–6 m2, carrying a current of

2A. Assume that there are 10 x 1028 electrons/m3.

53. Explain the working of Daniel cell.


currents along the same direction and experience a mutually attractive force 3.6 x 10–4 N. Find the current

through the conductors.

55. Define efficiency of a transformer. Explain the various energy losses in a transformer. How are they

minimised?


57. Explain the spectral series of hydrogen atom. (Diagram not necessary)



60. Give an explanation for the binding energy curve. (Graph not necessary)

61. A transistor is connected in CE configuration. The voltage drop across the load resistance (Rc) 3 k is 6V.

Find the base current. The current gain of the transistor is 0.97.

62. With the help of a neat block diagram, explain the function of FM transmitter.

PART – IV 4 x 10 = 40



63. What is an electric dipole? Derive an expression of electric field due to an electric dipole at a point along the

axial line.

64. Discuss the motion of a charged particle in a magnetic field.




67. Describe the J.J. Thomson method for determining the specific charge of an electron.


69. Draw a neat diagram of bridge rectifier and explain its working.


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PART – I 30 x 1 = 30




1. If 1 kg of substance is fully converted into energy, the energy produced is

(a) 9 x 1016 J (b) 9 x 1024 J (c) 1 J (d) 3 x 108 J

2. Isotopes have

(a) same mass no. but different atomic numbers (b) same proton number and neutron number

(c) same proton no. but different neutron numbers (d) same neutron no. but different proton numbers


(a) neutrons (b) -particles (c) -rays (d) -particles

4. The half-life period of N13 is 10.1 minute. Its life time is

(a) 5.05 minute (b) 20.2 minute (c) 10.1 / 0.6931 minute (d) infinity

5. The coolant used in fast breeder reactor is

(a) ordinary water (b) heavy water (c) liquid sodium (d) boron carbide

6. In a series RLC circuit, at resonance

(a) XL = XC (b) XL > XC (c) XL < XC (d) = 1/LC




8. The dark lines found in the solar spectrum are called

(a) Raman lines (b) Fraunhofer lines (c) Stokes lines (d) Anti-Stokes lines

9. In Young’s experiment, the third bright band for wavelength of light 6000 Ao coincides with the fourth bright

band for another source in the same arrangement. The wavelength of another source is

(a) 4500 Ao (b) 6000 Ao (c) 5000 Ao (d) 4000 Ao

10. A ray of light traveling in a rarer medium and reflected at the surface of a denser medium automatically

undergoes a

(a) phase change of /2 (b) phase change of 2 (c) path difference of (d) path difference of /2

11. Which of the following quantities is a scalar?

(a) Electric force (b) Electric potential (c) Electric field (d) Electric dipole moment

12. The capacitance of a parallel plate capacitor increases from 5 F to 60 F, when a dielectric is filled between

the plates. The dielectric constant of the dielectric is

(a) 65 (b) 55 (c) 12 (d) 10

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13. The intensity of electric field at a point is equal to

(a) the force experienced by a charge q

(b) the work done in bringing unit positive charge from infinity to that point

(c) the positive gradient of the potential

(d) the negative gradient of the potential

14. The capacitance of a capacitor is

(a) directly proportional to the charge q given to it

(b) inversely proportional to its potential V

(c) directly proportional to the charge q and inversely proportional to the potential V

(d) independent of both the charge q and potential V

15. The relation between current and drift velocity is

(a) e

VAnI d (b) eVAnI d (c)

A

VenI d (d) EVAnI d


(a) 1 eV (b) 1.2 eV (c) 1.1 eV (d) 2.1 eV

17. The colour of the light emitted by an LED depends on


(c) its forward bias (d) the type of semiconductor material




19. For FM receivers, the intermediate frequency is

(a) 455 kHz (b) 455 MHz (c) 10.7 kHz (d) 10.7 MHz




hydrogen atom is

(a) 13.6 eV (b) 10.2 eV (c) 3.4 eV (d) 1.89 eV

22. If c is the velocity, the frequency and the wavelength of a radiation, then its frequency is defined as

(a) the number of waves in a distance of 1 metre (b) the number of waves in a distance of

(c) the number of waves in a distance of c (d) the number of waves in a period of T second

23. A Coolidge tube operates at 24800 V. The maximum frequency of X-ray emitted from Coolidge tube is


24. The elliptical orbits of electron in the atom were proposed by

(a) J.J. Thomson (b) Bohr (c) Sommerfeld (d) de Broglie

25. The de Broglie wavelength of electron accelerated with a potential V is

(a) meV

h (b)

meV2

h (c)

meV2m

h (d)

m/eVm

h

26. When the number of turns (n) in a galvanometer is doubled, current sensitivity

(a) remains constant (b) decreases twice (c) increases twice (d) increases four times

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(a) the current in the thermocouple (b) the time for which current flows

(c) the temperature of the junction (d) the charge that passes through the thermocouple

28. An emf of 12 V is induced when the current in the coil changes at the rate of 40 As–1. The coefficient of self

induction of the coil is

(a) 0.3 H (b) 0.003 H (c) 30 H (d) 4.8 H

29. A rectangular coil is uniformly rotated in a uniform magnetic field such that the axis of rotation is

perpendicular to the direction of the magnetic field. When the plane of the coil is perpendicular to the

magnetic field, then

(a) (i) is zero, (ii) induced emf is zero (b) (i) is maximum, (ii) induced emf is maximum

(c) (i) is maximum, (ii) induced emf is zero (d) (i) is zero, (ii) induced emf is maximum

30. Which of the following devices does not allow D.C to pass through?

(a) Resistor (b) Capacitor (c) Inductor (d) all of these

PART – II 15 x 3 = 45


31. Define ‘coulomb’ on the basis of Coulomb’s law.

32. What is non-polar molecule? Give example.


34. The resistance of nichrome wire at 0oC is 10 . If its temperature of coefficient of resistance is 0.004/oC, find

its resistance at boiling point of water.

35. State Faraday’s first law of electrolysis.

36. State Fleming’s left hand rule.

37. What are the methods of producing induced emf?

38. An aircraft having a wing span of 20.48 m flies due north at a speed of 40 ms–1. If the vertical component of

earth’s magnetic field at the place is 2 x 10–5 T. Calculate the emf induced between the ends of the wings.


40. A plano-convex lens of radius 3m is placed on an optically flat glass plate and is illuminated by

monochromatic light. The radius of the 8th dark ring is 3.6 mm. Calculate the wavelength of light used.

41. Define ionisation potential.


first order.

43. Mention any three applications of photoelectric cells.

44. What is mass defect?

45. Define curie.

46. What do you mean by extrinsic semiconductor?

47. What are the essential components of an LC oscillator?

48. What is Zener diode?

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49. When the negative feedback is applied to an amplifier of gain 50, the gain after feedback falls to 25.

Calculate feedback ratio.

50. What is skip distance?

PART – III 7 x 5 = 35




51. Derive an expression for the torque experienced by an electric dipole when placed in a uniform electric field.

52. Describe an experiment to compare the emfs of two cells using potentiometer.

53. Find the current flowing across three resistors 3 , 5 and 2 connected in parallel to a 15 V supply. Also

find the effective resistance and total current drawn from the supply. (OR)

In a metre bridge, the balancing length for a 10 resistance in left gap is 51.8 cm. Find the unknown

resistance and specific resistance of a wire of length 108 cm and radius 0.2 mm.

54. A galvanometer has a resistance of 40 . It shows full scale deflection for a current of 2 mA. How will you

convert the galvanometer into a voltmeter of range 0 to 20 V?

55. Explain the energy loss in the transformer. How are they minimised?

56. Distinguish between interference and diffraction.

57. An electron beam passes through a transverse magnetic field of 2 x 10–3 T and an electric field E of

3.4 x 104 V/m acting simultaneously. If the path of the electrons remains undeviated, calculate the speed

of electrons. If the electric field is removed, what will be the radius of the electron path?

58. Derive an expression for the de Broglie wavelength of matter waves.

59. Explain length contraction.

60. Write the properties of -rays.


62. Explain the functions of an AM radio transmitter with the help of a block diagram.

PART – IV 4 x 10 = 40



63. Derive the expression for electric field due to an electric dipole at a point along its axial line.

64. State the principle and explain the construction and working of a cyclotron.



67. Describe the J.J.Thomson’s method for determining the specific charge of an electron.

68. Discuss the action of a Bainbridge mass spectrometer to determine the isotopic masses.

69. Explain the output characteristics of an NPN transistor connected in common emitter configuration with the

help of a neat diagram.

70. Make an analysis of amplitude modulated wave with the help of frequency spectrum.

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PART – I 30 x 1 = 30




1. An emf of 12 V is induced when the current in the coil changes at the rate of 40 As–1. The coefficient of

self induction of the coil is

(a) 30 H (b) 0.003 H (c) 4.8 H (d) 0.3 H

2. In an X-ray tube, the intensity of X-ray beam is increased by



3. In sommerfeld atom model, for a given value of ‘n’, the number of values ‘l’ can take is

(a) n (b) n + 1 (c) n – 1 (d) 2n + 1

4. The wave number of a spectral line of hydrogen atom is equal to Rydberg’s constant. The line is

(a) first line of Lyman series (b) series limit of Lyman series

(c) first line of Pfund series (d) series limit of Pfund series

5. Cathode rays are

(a) a stream of electrons (b) a stream of positive ions

(c) a stream of uncharged particles (d) a stream of photons

6. The electric field outside the plates of two oppositely charged plane sheets of charge density ‘’ is

(a) /2o (b) –/2o (c) /o (d) zero

7. The intensity of the electric field that produces a force of 10–5 N on a charge of 5 C is

(a) 5 x 10–11 NC–1 (b) 50 NC–1 (c) 2 NC–1 (d) 0.5 NC–1

8. The unit of the number of electric lines of force passing through a given area is

(a) no unit (b) NC–1 (c) Nm2C–1 (d) Nm

9. If a point lies at a distance x from the mid-point of the dipole, the electric potential at this point is proportional to

(a) 2x

1(b) 3x

1(c)

4x

1(d)

2/3x

1

10. If the length of the copper wire has a certain resistance R, then on doubling the length, its specific resistance

(a) will be doubled (b) will become ¼ th (c) will become 4 times (d) will remain the same

11. Which of the following are isotones?

(a) 92U235 and 92U

238 (b) 8O16 and 7N

14 (c) 6C14 and 7N

14 (d) 7N14 and 6C

13

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12. A graph is drawn taking frequency of incident radiation () along the x-axis and its stopping potential (V0)

along the y-axis. The nature of the graph is

(a) a straight line (b) a parabola (c) an ellipse (d) a circle

13. Arrange , and rays in the increasing order of their ionizing power:

(a) (b) (c) (d)


(a) uncontrolled fission reaction (b) controlled fission reaction

(c) fusion reaction (d) thermonuclear reaction

15. The radioisotope used in agriculture is

(a) 15P31 (b) 15P

32 (c) 11Na23 (d) 11Na24

16. An electron is moving with a velocity of 3 x 106 ms–1 perpendicular to a uniform magnetic field of induction

0.5 T. The force experienced by the electron is

(a) 2.4 x 10–13 N (b) 13.6 x 10–27 N (c) 13.6 x 10–11 N (d) zero

17. The period of revolution of charged particle inside a cyclotron does not depend on the

(a) magnetic induction (b) charge of the particle (c) velocity of the particle (d) mass of the particle

18. Lenz’s law is in accordance with the law of conservation of

(a) charges (b) flux (c) momentum (d) energy


(a) AC only (b) DC only

(c) both AC and DC (d) AC more effectively than DC

20. In an AC circuit, the voltage leads the current by a phase of /2, then the circuit has

(a) only an inductor (L) (b) only a capacitor (C) (c) only a resistor (R) (d) L, C and R in series


(a) collision (b) ionisation (c) doping (d) recombination

22. In a transistor, the value of

11 is equal to

(a) (b) (c) / (d) 1

23. According to law of Boolean algebra, the expression (A + AB) is equal to

(a) A (b) AB (c) B (d) A




(a) Cathode (b) Control grid (c) Filament (d) Anode

26. In an electromagnetic wave, the phase difference between electric field E

and magnetic field B

is

(a) /4 (b) /2 (c) (d) zero

27. Refractive index of glass is 1.5. Time taken for light to pass through a glass plate of thickness 10 cm is

(a) 2 x 10–8 s (b) 2 x 10–10 s (c) 5 x 10–8 s (d) 5 x 10–10 s

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light?

(a) Bands disappear

(b) No change

(c) Diffraction pattern becomes narrower and crowded together

(d) Diffraction pattern becomes broader and farther apart

29. Waves from two coherent sources interfere with each other. At a point where the trough of one wave

superposes with the trough of the other wave, the intensity of light is

(a) maximum (b) minimum (c) zero (d) no change

30. The wavelength of the matter wave is independent of


PART – II 15 x 3 = 45

Note : Answer any fifteen questions

31. State Gauss law in electrostatics.

32. Mention three applications of capacitors.


34. Find the magnitude and direction of the current in the following circuit:

A 10V B

5 10

20V 5

D C


36. State tangent law.

37. An aircraft having a wingspan of 20.48 m flies due north at a speed of 40 ms-1. If the vertical component of

earth’s magnetic field at the place is 2 x 10–5 T. Calculate the e.m.f. induced between the ends of the wings.


39. State Brewster’s law.

40. In young’s experiment the width of the fringes obtained with light of wavelength 6000 Ao is 2 mm. Calculate

the fringe width, if the entire apparatus is immersed in a liquid of refractive index 1.33.

41. Calculate the longest wavelength than can be analysed by a rock salt crystal of spacing d = 2.82 Ao in the

first order.


43. Write the two fundamental postulates of special theory of relativity.

44. Write the proton-proton cycle that takes place in sun and stars.

45. What percentage of a given radioactive substance will be left after 5 half-life periods?

46. Prove the Boolean identity : (A + B) (A + C) = A + BC.

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47. What is an Extrinsic semiconductor?

48. Draw the circuit diagram for inverting amplifier using Op-Amp.

49. Mention any three advantages of a negative feedback.


PART – III 7 x 5 = 35





52. Explain the construction and working of Daniel cell with a neat diagram.


54. What are the special features of magnetic Lorentz force?

55. Explain the various power losses in a transformer. How are they minimised?

56. A monochromatic light of wavelength 589 nm is incident on a water surface of refractive index 1.33. Find the

velocity, frequency and wavelength of light in water. (OR)

A planoconvex lens of radius 3m is placed on an optically flat glass plate and is illuminated by


57. Write any five properties of X-rays.


59. A proton is moving at a speed of 0.900 times the velocity of light. Find its kinetic energy in joule and MeV.

60. Explain Soddy-Fajan’s radioactive displacement laws.

61. Explain how multimeter is used as ohm-meter (multimeter diagram is not necessary).

62. A 10 MHz sinusoidal carrier wave of amplitude 10 mV is modulated by a 5 kHz sinusoidal audio signal wave

of amplitude 6 mV. Find the frequency components of the resultant modulated wave and their amplitudes.

PART – IV 4 x 10 = 40



63. Derive an expression for the electric field due to an electric dipole at a point on its axial line.

64. Obtain an expression for the force between two long parallel current carrying conductors. Hence define

‘ampere’.

65. Describe the principle, construction and working of single phase AC generator.


67. With the help of energy level diagram, explain the working of He-Ne laser.

68. Explain the construction and working of a Geiger-Muller counter.

69. With a neat circuit diagram, explain the working of a single stage CE amplifier. Draw the frequency response

curve and discuss the results.

70. With the help of block diagram, explain the function of superhetrodyne AM receiver.

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1. When the frequency of an AC circuit increases, the capacitive reactance offered by the capacitor connected

in the circuit

(a) increases (b) decreases (c) remains the same (d) becomes zero

2. When a drop of water is introduced between the glass plate and planoconvex lens in Newton’s ring system,

the ring system



3. The nature of the wavefront corresponding to extraordinary ray inside a calcite crystal is

(a) plane (b) spherical (c) elliptical (d) cylindrical




5. A ray of light is incident on a plane glass surface at an angle 57o 30'. The angle between the reflected ray

and the refracted ray is

(a) 32o 30' (b) 90o (c) 115o (d) 57o 30'

6. In the forward bias characteristic curve, a diode appears as

(a) a high resistance (b) a capacitor (c) an OFF switch (d) an ON switch




8. A logic gate for which there is an output only when both the inputs are zero is

(a) NAND (b) NOR (c) EXOR (d) AND



10. The intermediate frequency of the superheterodyne AM receiver is

(a) 455 kHz (b) 10.7 MHz (c) 455 Hz (d) 455 MHz




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12. Magnetic induction at a distance ‘a’ from an infinitely long straight conductor carrying a current ‘I’ and placed

in a medium of permeability is

(a)a4

Io

(b)a2

Io

(c)a4

I

(d)a2

I

13. The unit henry can also be written as

(a)Vs A–1 (b) Wb A–1 (c) s (d) all of these

14. Which of the following does not allow DC to pass through?


15. The resonant frequency of RLC circuit is o. The inductance is doubled. The capacitance is also doubled.

Now the resonant frequency of the circuit is

(a) 2 o (b)2o (c)

4o (d)

2

o

16. A photon of energy 2E is incident on a photosensitive surface of photoelectric work function E. The maximum

kinetic energy of photoelectron emitted is

(a) E (b) 2E (c) 3E (d) 4E




(a) 15P31 (b) 15P

32 (c) 26Fe59 (d) 11Na24

19. Nuclear fission can be explained by

(a) shell model (b) Liquid drop model (c) Quark model (d) Bohr atom model

20. When mass number increases, nuclear density

(a) increases (b) decreases

(c) remains constant (d) may increase (or) decrease

21. The electric field outside the plates of two oppositely charged plane sheets of charge density σ is

(a)o2

(b)o2

(c)o

(d) zero


(a) C2 N–1 m–2 (b) N m2 C–2 (c) H m–1 (d) N C–2 m–2

23. A dielectric medium is placed in an electric field E0 . The field induced inside the medium

(a) acts in the direction of the electric field E0 (b) acts opposite to E0

(c) acts perpendicular to E0 (d) is zero

24. The electric potential energy (U) of two point charges is

(a) 2

o

21

r4

qq

(b)

r4

qq

o

21

(c) pE cos (d) pE sin

25. When two 2Ω resistances are in parallel, the effective resistance is

(a) 2Ω (b) 4Ω (c) 1Ω (d) 0.5Ω

26. The ratio of the radii of the first three Bohr orbits of the hydrogen atom is

(a) 1 : 1/2 : 1/3 (b) 1 : 2 : 3 (c) 1 : 4 : 9 (d) 1 : 8 : 27

27. X-ray is


(c) conversion of energy into mass (d) principle of conservation of charge

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28. In holography which of the following is/are recorded in photographic film?

(a) phase only (b) amplitude only

(c) phase and amplitude (d) frequency and amplitude

29. In Millikan’s oil drop experiment, charged oil drop is balanced between the two plates. Now the viscous force

(a) acts downwards (b) acts upwards

(c) is zero (d) acts either upwards or downwards

30. The work function of a photoelectric material is 3.3 eV. The threshold frequency will be equal to


PART – II 15 x 3 = 45


31. What is an electric dipole? Define electric dipole moment.

32. What is non-polar molecule? Give an example.

33. If 6.25 x 1018 electrons flow through a given cross-section in unit time. Find the current. Given: charge of an

electron is 1.6 x 10–19 C.

34. Compare emf and potential difference.

35. State Kirchhoff’s voltage law.

36. Define peltier Coefficient.



39. A light of wavelength 6000 Ao falls normally on a thin air film. 6 dark fringes are seen between two points.

Calculate the thickness of the thin film.

40. What are the factors on which optical rotation depends on?

41. The minimum wavelength of X-rays produced from a Coolidge tube is 0.05 nm. Find the operating voltage of

the Coolidge tube.

42. Mention any three applications of laser in medical field.

43. Find de Broglie wavelength of electron in the fourth orbit of hydrogen atom.

44. Write any three properties of neutrons.

45. What are the uses of nuclear reactors?

46. What are the advantages of IC?

47. Define input impedance of a transistor connected in CE mode.

48. Draw difference amplifier circuit using Op-Amp.

49. Give the Boolean equation for the given logic diagram.

A

B

R

C

D


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PART – III 7 x 5 = 35




51. Three capacitors each of capacitance 9 pF are connected in series

(i) What is the total capacitance of the combination?

(ii) What is the potential difference across each capacitor, if the combination is connected to 120 V supply?

(OR) A

Three charges – 2 x 10–9 C, + 3 x 10–9 C and – 4 x 10–9 C

are placed at the vertices of an equilateral triangle ABC of A1 C1

side 20 cm. Calculate the work done in shifting the charges

from A, B and C to A1, B1 and C1 respectively which are

the mid-points of the sides of triangle. B B1 C

52. Mention any five applications of superconductors.



55. State Faraday’s laws and Lenz’s law of electromagnetic induction.

56. Obtain the expression for the radius of the nth dark ring in Newton’s rings experiment.

57. What is characteristic X-ray spectrum? Explain its origin.



at rest?

60. A reactor is developing energy at the rate of 32 MW. Calculate the required number of neutrons per second

of 92U235. Assume that energy per fission is 200 MeV.

61. Explain the working of a half-wave diode rectifier.

62. Explain the function of FM transmitter with neat block diagram.

PART – IV 4 x 10 = 40



63. State Gauss law. Using Gauss law, obtain an expression for electric field due to an infinitely long straight

uniformly charged wire.





67. Explain the working of a Ruby Laser with the help of energy level diagram.

68. Explain in detail the principle, construction and working of Bainbridge mass spectrometer.

69. With a neat circuit diagram, explain the working of Colpitts oscillator.


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PART – I 30 x 1 = 30




1. An example for uniaxial crystal is

(a) Selenite (b) Mica (c) Topaz (d) Calcite

2. If 1 kg of a substance is fully converted into energy then the energy produced is

(a) 9 x 1016 J (b) 9 x 1024 J (c) 1 J (d) 3 x 108 J

3. The rays which have the greatest ionizing power are

(a) neutrons (b) -rays (c) -rays (d) -rays

4. The Coolidge tube operates at 24800V. The maximum frequency of x-radiation emitted from Coolidge tube is


5. Hydrogen bomb is based on the principle of

(a) nuclear fission (b) nuclear fusion (c) nuclear force (d) carbon nitrogen cycle

6. If the length of a copper wire has a certain resistance R then on doubling the length, its specific resistance

(a) will be doubled (b) will become ¼ th (c) will become 4 times (d) will remain the same

7. ‘n’ capacitors each of capacitance C are connected in series. The effective capacitance is

(a) n/C (b) C/n (c) nC (d) C






(c) both audio signal & high frequency carrier waves (d) low frequency carrier waves

10. The cosmic ray intensity is maximum at a latitude of

(a) 0o (b) 45o (c) 90o (d) 60o

11. Fuse wire

(a) is an alloy of lead and copper (b) has low resistance

(c) has high resistance (d) has high melting point



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13. In a thermocouple the temperature of the cold junction is – 30o C and the neutral temperature is 270o C. The


(a) 520o C (b) 540o C (c) 500o C (d) 570o C

14. The ratio of the radii of the first three Bohr orbits of hydrogen atom is

(a) 1 : 1/2 : 1/3 (b) 1 : 2 : 3 (c) 1 : 4 : 9 (d) 1 : 8 : 27

15. If ‘’ is the frequency of characteristic x-ray line emitted by a target element of atomic number Z, then

Mosley’s law is

(a) Z (b) Z (c) Z2 (d) Z3


(a) majority carriers (b) minority carriers (c) acceptor ions (d) donor ions

17. Printed documents to be transmitted by fax are converted into electrical signal by the process of


18. The phase reversal between the input and output voltages in single stage CE amplifier is

(a) /2 (b) 2 (c) (d) 3/2



20. According to Rutherford atom model, the spectral lines emitted by an atom is

(a) line spectrum (b) continuous spectrum

(c) continuous absorption spectrum (d) band spectrum

21. The work done in moving 500 μC charge between two points on equipotential surface is

(a) zero (b) finite positive (c) infinite negative (d) infinite


(a) Vs A–1 (b) Wb A–1 (c) s (d) all of these


light?

(a) Bands disappear

(b) No change

(c) Diffraction pattern becomes narrower & crowded together

(d) Diffraction pattern becomes broader & further apart

24. In an AC circuit


(c) the average power dissipation is zero (d) the rms current is √2 times of peak current

25. The existence of electromagnetic waves was confirmed experimentally by

(a) Hertz (b) James Clark (c) Maxwell (d) Huygens



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27. The nuclear force between a proton and another proton inside the nucleus is

(a) zero (b) short range (c) repulsive (d) long range

28. In a pile of plates arrangement, the angle between the incident light and the reflected plane polarized light is

(a) 32.5o (b) 57.5o (c) 90o (d) 115o

29. De Broglie wavelength of an electron accelerated with a potential V is

(a) mV

h(b)

eV2m

h(c)

eVm2

h(d)

eVm2

h

30. A non-polar dielectric is placed in an electric field (E). Its induced dipole moment

(a) is zero (b) acts in the direction of E

(c) acts opposite to the direction of E (d) acts perpendicular to E

PART – II 15 x 3 = 45



32. What is meant by dielectric polarisation?

33. Define drift velocity. Give its unit.

34. The resistance of a nichrome wire at 0o C is 10 . If its temperature coefficient of resistance is 0.004 /oC, find


35. Mention the applications of secondary cells.

36. Define ampere.

37. A capacitor blocks DC but allows AC. Why?

38. Write the equation of a 25 cycle current sine wave having rms value of 30 A.

39. State Huygen’s principle.



41. What are the drawbacks of Sommerfeld atom model?

42. Write any three applications of laser in medical field.

43. Differentiate between inertial and non-inertial frames of reference.


45. Calculate the number of atoms in one gram of 3Li6. ( Avagadro number = 6.023 x 1023 )

46. What is Zener diode?


48. Using transistor, draw the circuit of NOT gate.

49. The gain of an amplifier without feedback is 100. If 5% of the output voltage is fed back into the input

through a negative feedback network, find out the voltage gain after feedback.

50. What are the different types of radio wave propagation?

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PART – III 7 x 5 = 35





52. Explain how the emfs of two cells are compared using potentiometer.

53. The effective resistances are 10 , 2.4 when two resistors are connected in series and parallel. What are

the resistances of individual resistors?

54. Two straight infinitely long parallel wires carrying equal current placed at a distance of 20 cm apart

experience a mutually attractive force of 4.9 x 10-5 N per unit length of the wire. Calculate the current.

55. Obtain an expression for the current flowing in a circuit containing resistance only to which alternating emf is

applied. Find the phase relationship between voltage and current.


57. Obtain Bragg’s law for X-ray diffraction.

58. State the laws of photoelectric emission.


60. Calculate the energy released in the following equation: 3Li6 + 0n1 2He4 + 1H

3

Given mass of 3Li6 nucleus = 6.015126 amu ; Mass of 0n1 = 1.008665 amu

Mass of 2He4 nucleus = 4.002604 amu ; Mass of 1H3 nucleus = 3.016049 (OR)

A piece of bone from an archaeological site is found to give a count rate of 15 counts per minute. A similar

sample of fresh bone gives a count rate of 19 counts per minute. Calculate the age of the specimen. Given

T1/2 = 5570 years.

61. State and prove De Morgan’s theorem.

62. What is an optical fibre? Write the advantages of optical fibre communication.

PART – IV 4 x 10 = 40



63. Derive an expression for electric potential at a point due to an electric dipole. Discuss the special cases.

64. Describe the principle, construction and working of a cyclotron with a diagram.



66. Derive an expression for bandwidth of interference fringes in Young double slit experiment.

67. Describe the J.J. Thomson method for determining the specific charge of electron.

68. State the law of radioactive disintegration. Obtain the relation N = No e–t. Derive the relation between half-life

period and decay constant.

69. Explain the working of Bridge rectifier.

70. Explain the principle and working of radar with neat block diagram.

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MARCH 2012 22642647 / 22395248


Duration : 3 Hours PHYSICS Maximum : 150 marks

PART – I 30 x 1 = 30

N.B. : (i) Answer all questions.(ii) Choose and write the correct answer.


light?

(a) Bands disappear (b) No change

(c) Diffraction pattern becomes narrower and crowded together

(d) Diffraction pattern becomes broader and further apart







A

C

B

(a) AND (b) OR (c) NAND (d) EXOR



6. The unit of disintegration constant is

(a) no unit (b) second (c) second–1 (d) curie

7. The explosion of hydrogen bomb is based on the principle of

(a) uncontrolled fission reaction (b) nuclear fusion reaction

(c) controlled fission reaction (d) photoelectric effect

8. Nichrome wire is used as the heating element because it has

(a) low specific resistance (b) low melting point (c) high conductivity (d) high specific resistance

9. Which of the following produces large Joule heating effect?

(a) 1A current through 2 resistor for 3 second (b) 1A current through 3 resistor for 2 second

(c) 2A current through 1 resistor for 2 second (d) 3A current through 1 resistor for 1 second

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10. In the photoelectric phenomenon if the ratio of the frequency of incident radiation incident on a

photosensitive surface is 1 : 2 : 3, the ratio of the photoelectric current is

(a) 1 : 2 : 3 (b) √1 : √2 : √3 (c) 1 : 4 : 9 (d) 1 : 1 : 1



12. When the charge given to a capacitor is doubled, is capacitance

(a) increases twice (b) decreases twice (c) increases four times (d) does not change

13. The value of relative permittivity of air is

(a) 8.854x10–12 C2 N–1m–2 (b) 9 x 109 C2 N–1m–2 (c) 1 (d) 8.854 x 1012 C2 N–1m–2



15. A hollow metal ball carrying an electric charge produces no electric field at points


(c) inside the sphere (d) at a distance more than twice

16. In amplitude modulation, the bandwidth is _________ the signal frequency.

(a) equal to (b) twice (c) thrice (d) four times


(a) to avoid flicker in the picture (b) the fact that handling of higher frequency is easier

(c) that 50 Hz is the power line frequency in India (d) to avoid unwanted noises in the signals

18. Angle between the electric component and magnetic component of an electromagnetic wave is

(a) 0 (b) /4 (c) /2 (d)

19. The path difference between two monochromatic light waves of wavelength 4000 Ao is 2 x 10–7 m. The

phase difference between them is

(a) (b) 2 (c) 3/2 (d) /2

20. If i is the angle of incidence, the angle between the incident wavefront and the normal to the reflecting

surface is

(a) i (b) 90o – i (c) 90o + i (d) i – 90o

21. The rms value of AC voltage with peak of 311 V is

(a) 220 V (b) 311 V (c) 180 V (d) 320 V


(a) Resistor (b) Capacitor (c) Inductor (d) all of these


(a) Transformer (b) Room heater (c) AC generator (d) Choke coil

24. Positive rays of the same element produce two different traces in Bainbridge mass spectrometer. The

positive ions have

(a) same mass with different velocities (b) same mass with same velocity

(c) different masses with same velocity (d) different masses with different velocities


(a) half-life (b) mean life (c) half-life/2 (d) twice the mean life

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26. If the kinetic energy of the moving particle is E, then the de Broglie wavelength is

(a) =mE2h (b) =

hmE2 (c) = h mE2 (d) =

m2Eh

27. When the diameter of a conductor is doubled, its resistance

(a) decreases twice (b) decreases four times

(c) decreases sixteen times (d) increases four times

28. In hydrogen atom which of the following transitions produces spectral line of maximum wavelength?

(a) 2 1 (b) 4 1 (c) 6 5 (d) 5 2

29. When an electron jumps from M shell to the K shell it gives

(a) K line (b) K line (c) L line (d) L line



PART – II 15 x 3 = 45

N.B. Answer any fifteen questions

31. Write the applications of capacitors.

32. Calculate the potential at a point due to a charge 4x10–7 C located at 0.09 m away from it.

33. State Kirchhoff’s voltage law.

34. What are the applications of secondary cells?

35. Define transition temperature.

36. Define Peltier coefficient. Give its unit.


38. Write the equation of a 25 cycle current sine wave having rms value of 30 A.

39. State Huygens’ principle.

40. In Young’s double slit experiment, the distance between the slits is 1.9 mm. The distance between the slit

and the screen is 1 m. If the bandwidth is 0.35 mm. Calculate the wavelength of light used.


42. A beam of electrons moving with a uniform speed of 4 x 107 ms-1 is projected normal to the uniform magnetic

field where B = 10–3 Wb/m2.. What is path of the beam in magnetic field?


44. Select the pairs of isotopes, isobars and isotones from the following nuclei: 11Na22, 12Mg24, 11Na24, 10Ne23

45. Write a note on leptons.

46. Distinguish between Avalanche breakdown and Zener breakdown.

47. Find the output of the ideal operational amplifier shown in the figure for the input of V in = 120 mV DC is

39 k

15 k

Vin Vout

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50. Define amplitude modulation.

PART – III 7 x 5 = 35

N.B. : (i) Answer the question number 59 compulsorily.(ii) Answer any six questions of the remaining 11 questions.(iii) Draw diagrams wherever necessary.

51. Prove that the energy stored in a parallel plate capacitor is q2/2C.

52. Three resistors R1 = 5, R2 = 3, R3 = 2 are connected in series with 10 V power supply. Find the voltage

drop across each resistor and effective resistance of series combination.

53. How will you compare the emfs of two cells using a potentiometer?


55. Obtain an expression for the coefficient of mutual induction of two long solenoids.

56. Obtain an expression for the radius of the nth dark ring in Newton’s ring experiment.

57. Explain the spectral series of hydrogen atom (diagram not necessary).


59. (a) How fast would a rocket have to go relative to an observer for its length to be corrected to 99% of its

length at rest? [OR]

(b) The work function of iron is 4.7 eV. Calculate the cut-off frequency and the corresponding cut-off

wavelength for this metal.

60. Show that the mass of radium (88Ra226) with an activity of 1 curie is almost 1 gram (T1/2 =1600 years).

61. Explain the working of a diode as half wave rectifier.

62. Mention the principle of radar and write its applications.

PART – IV 4 x 10 = 40

N.B. : (i) Answer any four questions in detail.(ii) Draw diagrams wherever necessary.

63. State Guass’ law. Using this find an expression for electric field due to an infinitely long straight charged wire

with uniform charge density.


65. Write the principle and explain the construction and working of a transformer. Define its efficiency.


67. State the postulates of Bohr atom model. Obtain an expression for the radius of the nth orbit of H–atom.

68. Obtain an expression to deduce the amount of radioactive substance present at any moment. Obtain the

relation between half-life period and decay constant.

69. Sketch the circuit of a Colpitts oscillator and explain its working.

70. With the help of a functional block diagram, explain the operation of a superheterodyne AM receiver.

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JUNE 2012 22642647 / 22395248



PART – I 30 x 1 = 30


1. Peltier coefficient at a junction of a thermocouple depends on the

(a) current in the thermocouple (b) time for which current flows

(c) temperature of the junction (d) charge that passes through the thermocouple

2. Of the following devices which has small resistance?

(a) Moving coil galvanometer (b) 0 – 1 A ammeter

(c) 0 – 10 A ammeter (d) Voltmeter






(a) Resistor (b) Inductor (c) Capacitor (d) All of these

6. According to Bohr’s postulates, which of the following quantities take discrete values?


7. X-ray is

(a) conversion of energy into mass (b) a phenomenon of conversion of KE into radiation

(c) principle of conservation of charge (d) conversion of momentum

8. In holography, which of the following is recorded in photographic film?

(a) Frequency alone (b) amplitude alone (c) phase alone (d) phase and amplitude

9. At the threshold frequency the velocity of electron is


10. When the momentum of a particle increases, its de Broglie wavelength

(a) increases (b) decreases (c) does not change (d) infinity

11. In a PN junction diode on the side of N but very close to the junction there are

(a) donor atoms (b) acceptor atoms (c) immobile positive ions (d) immobile negative ions

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12. The following arrangement performs the logic function of A

o o C B

(a) AND gate (b) OR gate (c) NAND gate (d) EX-OR gate





15. Arrange the spectral lines H, H, H, H in the increasing order of their wavelength.

(a) H, H, H, H (b) H, H, H, H (c) H, H, H, H (d) H, H, H, H

16. Electric field intensity is 400 V/m at a distance of 2 m from a point charge. It will be 100 V/m at a distance

(a) 50 cm (b) 4 cm (c) 4 m (d) 15 m



18. The unit of relative permittivity is

(a) C2N–1m–2 (b) Nm2C–2 (c) no unit (d) NC–2m–2

19. A cell of emf 2.2 V sends a current of 0.2 A through a resistance of 10. The internal resistance of the cell is

(a) 0.1 (b) 1 (c) 2 (d) 1.33

20. The electric field intensity at a short distance r from uniformly charged infinite plane sheet of charge is

(a) proportional to r (b) proportional to 1/r (c) proportional to 1/r2 (d) independent of r

21. Intermediate frequency in FM receiver is

(a) 455 kHz (b) 10.7 MHz (c) 40 MHz (d) 22 MHz

22. Atomic spectrum is a

(a) band absorption spectrum (b) band emission spectrum

(c) line absorption spectrum (d) pure line spectrum

23. When a drop of water is introduced between the glass plate and plano-convex lens in Newton’s rings

system, the ring system

(a) contracts (b) expands (c) remains same (d) none of these

24. Refractive index of a material for a polarising angle of 55o is

(a) 1.4281 (b) 1.7321 (c) 1.4141 (d) 1.5051

25. In a Nicol prism, the ordinary ray is prevented from coming out of canada balsam by the phenomenon of

(a) reflection (b) polarisation (c) diffraction (d) total internal reflection

26. The mass defect of certain nucleus is 0.03 amu. Then its binding energy is

(a) 27.93 eV (b) 27.93 keV (c) 27.93 GeV (d) 27.93 MeV

27. The half-life period of a radioactive element with decay constant 0.0693 /day is


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28. The nucleons in a nucleus are attracted by

(a) gravitational force (b) electrostatic force (c) nuclear force (d) magnetic force

29. Which of the following is massless and chargeless but carrier of energy and spin?

(a) Neutrino (b) Muon (c) Pion (d) Kaon


(a) recombination (b) doping (c) ionisation (d) collision

PART – II 15 x 3 = 45



32. Define electric flux. What is its unit?



35. From the following network find the effective resistance between A and B.

R1 = 15

A B

R2 = 15

36. A long straight wire carrying current produces a magnetic induction of 4 x 10–6 T at a point 15 cm from the

wire. Calculate the current through the wire.

37. Define unit of self-inductance.

38. Define Q factor.

39. Distinguish between Fresnel and Fraunhofer diffraction.

40. A plano-convex lens of radius 3 m is placed on an optically flat glass plate and is illuminated by a

monochromatic light. Calculate the wavelength of light if the radius of the 8 th dark ring is 3.6 mm.



first order.

43. Write the applications of photoelectric cells (any three).


45. What do you mean by artificial radioactivity?


47. Define 'bandwidth' of an amplifier.

48. What are universal gates? Why are they called so?

49. For a transistor to work, how is the biasing provided?


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PART – III 7 x 5 = 35


51. Write the properties of electric lines of forces.

52. Discuss the variation of resistance with temperature with an expression and a graph.

53. (a) An iron box of power 400 W is used daily for 30 minutes. If the cost per unit is 75 paise, find the weekly

expense on using the iron box. (OR)

(b) In a metre bridge, the balancing length for a 10 resistance in left gap is 51.8 cm. Find the unknown

resistance and specific resistance of a wire of length 108 cm and radius 0.2 mm.

54. Explain how a galvanometer is converted into an ammeter.

55. Obtain an expression for the current flowing in a circuit containing resistance only to which alternating emf is

applied. Find the phase relationship between voltage and current.


having 5000 lines per centimetre. A second order spectral line is found to be diffracted at an angle 30o. Find

the wavelength of the light.

57. Explain the origin of characteristic X-rays.

58. A metallic surface when illuminated with light of wavelength 3333 Ao emits electrons with energies upto


59. Obtain de Broglie's wavelength of matter waves.

60. Explain the formation of cosmic ray showers.

61. Explain the functions of an operational amplifier as a summing amplifier.

62. Write the merits and demerits of digital communication.

PART – IV 4 x 10 = 40


63. Explain the principle of a capacitor. Obtain the expression for the capacitance of a parallel plate capacitor.

64. Explain the experiment to verify Joule's law of heating.


66. Explain emission spectrum and absorption spectrum in detail.

67. Explain J.J. Thomson experiment to determine the specific charge of an electron.

68. Obtain the expression for radioactive disintegration law. Also obtain the relation between half-life period and

decay constant.

69. Explain the function of a bridge rectifier.


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OCTOBER 2012 22642647 / 22395248



PART – I 30 x 1 = 30


1. When an electron is accelerated with potential difference V, its de Broglie wavelength is directly proportional to

(a) V (b) V–1 (c) V1/2 (d) V–1/2

2. In N type semiconductor donor level lies

(a) just below the conduction band (b) just above the conduction band

(c) just below the valence band (d) just above the valence band


A

B Y

C

(a) 0 1 0 (b) 1 0 0 (c) 1 0 1 (d) 1 1 0

4. In the forward bias characteristic curve a diode appears as


5. In amplitude modulation

(a) the amplitude of the carrier wave varies in accordance with the amplitude of the modulating signal

(b) the amplitude of the carrier wave remains constant

(c) the amplitude of the carrier wave varies in accordance with the frequency of the modulating signal

(d) modulating frequency lies in the audio range.




(a) field magnet (b) split rings (c) slip rings (d) brushes

8. The radius of a nucleus is 5.2 F. The number of nucleons in the nucleus is

(a) 52 (b) 104 (c) 64 (d) 128




(a) 15P31 (b) 15P32 (c) 11Na23 (d) 11Na24

11. In hydrogen atom which of the following transitions produces a spectral line of maximum frequency?

(a) 2 1 (b) 6 2 (c) 4 3 (d) 5 2

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12. A narrow electron beam passes undeviated through an electric field E = 3 x 104 V/m and an overlapping

magnetic field B = 2 x 10–3 Wb/m2. The electron motion, electric field and magnetic field are mutually

perpendicular. The speed of the electron is

(a) 60 ms–1 (b) 10.3 x 107 ms–1 (c) 1.5 x 107ms–1 (d) 0.67 x 10–7 ms–1


hydrogen atom is

(a) 13.6 eV (b) 10.2 eV (c) 3.4 eV (d) 1.89 eV

14. In holography which of the following is/are recorded on the photographic film?

(a) Amplitude only (b) Frequency only (c) Amplitude and phase (d) Frequency and phase

15. When n resistors of equal resistance (R) are connected in series the effective resistance is

(a) n/R (b) R/n (c) 1/nR (d) nR






17. Atomic spectrum should be

(a) pure line spectrum (b) emission band spectrum

(c) absorption line spectrum (d) absorption band spectrum

18. In a plane transmission grating the width of a ruling is 12000 Ao and the width of a slit is 8000 Ao. The grating

element is

(a) 20 m (b) 2 m (c) 1 m (d) 10 m

19. Which of the following is used to study crystal structure?

(a) Microwave (b) Infrared rays (c) Ultraviolet rays (d) X-rays

20. At the threshold frequency the velocity of the electron is


21. The principle that is used in fibre optical communication is

(a) reflection (b) refraction (c) total internal reflection (d) polarisation

22. Nichrome wire is used as the heating element because it has

(a) low specific resistance (b) low melting point (c) high specific resistance(d) high conductivity

23. In the experiment to verify Joule’s law when the current passed through the circuit is doubled keeping

resistance (R) and time of passage of current (I) constant, temperature of the liquid

(a) increases twice (b) increases 4 times (c) increases 16 times (d) decreases 4 times

24. The coefficient of self-induction of a solenoid is independent of

(a) the number of turns in coil (b) the area of cross-section of he coil

(c) the length of the coil (d) the current passing through the coil

25. A DC of 5 A produces the same heating effect as an AC of

(a) 50 A rms current (b) 5 A peak current (c) 5 A rms current (d) none of these

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26. In proton-proton cycle four protons fuse together to give

(a) an -particle, two electrons, two neutrinos and energy of 26.7 MeV

(b) an -particle, two positrons, two neutrinos and energy of 26.7 MeV

(c) a helium atom, two positrons, two neutrinos and energy of 26.7 eV

(d) an -particle, two positrons, two antineutrinos and energy of 26.7 MeV

27. Electric field intensity is 400 Vm–1 at a distance of 2m from a point charge. It will be 100 Vm–1 at a distance of

(a) 50 cm (b) 4 cm (c) 4 m (d) 1.5 m

28. Electric potential energy (u) of two point charges is

(a)2

o

21

r4qq

(b)r4

qq

o

21

(c) pE cos (d) pE sin


(a) C2 N–1 m–2 (b) Nm2 C–2 (c) Hm–1 (d) NC–2m–2

30. Electric field intensity at a distance r from an infinitely long uniformly charged straight wire is directly

proportional to

(a) r (b) r–1 (c) r2 (d) r-–2

PART – II 15 x 3 = 45


31. Write any three properties of electric lines of force.

32. What is a capacitor? Define its capacitance.

33. The resistance of a nichrome wire at 0oC is 10 . If the temperature coefficient of resistance is 0.004/oC, find


34. Define resistivity of a material.


36. Define Thomson coefficient.

37. Define efficiency of transformer.



40. The refractive index of a medium is 3. Calculate the angle of refraction if the unpolarised light is incident on

it at the polarising angle of the medium.

41. What are the important characteristics of laser?

42. What the applications of Moseley’s law.


44. What do you mean by artificial radioactivity?


46. Prove the Boolean identity: (A + B) (A + C) = A + BC


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48. What is an integrated circuit?

49. The base current of a transistor is 50 A & collector current is 25 mA. Determine the values of and .

50. What is interlaced scanning?

PART – III 7 x 5 = 35

N.B. : (i) Answer question number 60 compulsorily.(ii) Answer any six questions of the remaining 11 questions.(iii) Draw diagrams wherever necessary.

51. Derive an expression for the torque acting on the electric dipole when placed in a uniform electric field.

52. List some applications of superconductors.

53. Explain the construction and working of a Leclanche cell.

54. The deflection of a galvanometer falls from 50 divisions to 10 divisions when 12 resistance is connected

across the galvanometer. Calculate the galvanometer resistance.

55. Explain how an emf can be induced by changing the area enclosed by the coil.

56. State and explain Brewster’s Law.

57. Explain the origin of characteristic X-rays.

58. What is the de Broglie wavelength of an electron of kinetic energy 120 eV?


60. (a) Calculate the energy released in the reaction: 13Al27 + 1H2 12Mg25 + 2He4

Given : mass of 13Al27 = 26.981535 amu ; Mass of 1H2 = 2.014102 amu ; Mass of 12Mg25 = 24.98584 amu

Mass of 2He4 = 4.002604 amu. (OR)

(b) Find the energy released when two 1H2 nuclei fuse together to form a single 2He4 nucleus. Given, the

binding energy per nucleon of 1H2 and 2He4 are 1.1 MeV and 7.0 MeV respectively.

61. Explain the action of a Zener diode as a voltage regulator with a necessary circuit.

62. Explain the function of Frequency Modulated (FM) transmitter with neat block diagram.

PART – IV 4 x 10 = 40


63. State the principle and explain the construction and working of van de Graff generator.

64. Obtain an expression for the force on a current carrying conductor placed in a magnetic field. Give the

magnitude and direction of the force.

65. Obtain expressions for (i) the effective voltage, (ii) the impedance, (iii) the phase relationship between

current and voltage in a LCR series AC circuit with help of vector diagram.


67. Explain the working of Ruby laser with the help of energy level diagram.

68. Discuss the principle and action of Bainbridge mass spectrometer to determine the isotopic masses.

69. Discuss the output characteristics of a transistor connected in CE mode with a neat circuit diagram.

70. Explain transmission and reception of Radar with a block diagram.

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MARCH 2013 22642647 / 22395248



PART – I 30 x 1 = 30


1. The electrical resistivity of a thin copper wire and a thick copper rod are respectively 1 Ωm and 2 Ωm. Then

(a) 1 > 2 (b) 2 > 1 (c) 1 = 2 (d) 2/1 = ∞

2. The instantaneous emf and current equations of an AC circuit are respectively e = 200 sin(t + /3) and

i = 10 sint. The average power consumed over one complete cycle is

(a) 2000 W (b) 1000 W (c) 500 W (d) 707 W

3. The nuclear radius of 4Be8 nucleus is

(a) 1.3 x 10–15 m (b) 2.6 x 10–15 m (c) 1.3 x 10–13 m (d) 2.6 x 10–13 m





(a) dipole moment (b) electric force (c) electric field (d) electric potential



7. The stopping potential of a metal surface is independent of

(a) frequency of incident radiation (b) intensity of incident radiation

(c) the nature of the metal surface (d) velocity of the electrons emitted

8. For a transistor connected in common emitter mode [CE] the slope of the input characteristic curve gives

(a) input impedance (b) current gain

(c) reciprocal of input impedance (d) voltage gain

9. The specific charge of the cathode ray particle

(a) depends on the nature of cathode (b) depends on the nature of anode

(c) depends on the nature of gas atoms present inside discharge tube

(d) independent of all the above

10. The half life period of N13 is 10.1 minute. Its life time is

(a) 5.05 minute (b) 20.2 minute (c) infinity (d) 10.1 / 0.6931 minute

11. The direction of force on a current carrying conductor placed in a magnetic field is given by

(a) Fleming’s Left Hand Rule (b) Fleming’s Right Hand Rule

(c) End Rule (d) Right Hand Palm Rule

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12. In Young’s double slit experiment, bandwidth contains

(a) a bright band only (b) a dark band only

(c) either a bright band or a dark band (d) both a bright band and a dark band

13. The electric field outside the plates of two oppositely charged plane sheets of charge density is

(a) + /2o (b) – /2o (c) zero (d) /o

14. The period of revolution of a charged particle inside a cyclotron does not depend on

(a) the magnetic induction (b) the charge of the particle

(c) the velocity of the particle (d) the mass of the particle


(a) audio signals (b) both audio signal and high frequency carrier waves

(c) high frequency carrier waves (d) low frequency carrier waves

16. A light of wavelength 6000 Ao is incident normally on a grating 0.005 m wide with 2500 lines. Then the

maximum order is

(a) 1 (b) 3 (c) 2 (d) 4









(a) resistor (b) capacitor (c) inductor (d) all of the above

21. According to Rutherford atom model, the spectrum emitted by an atom is

(a) line spectrum (b) continuous spectrum

(c) continuous absorption spectrum (d) band spectrum

22. X – ray is

(a) conversion of momentum (b) conversion of energy into mass

(c) principle of conservation of charge (d) phenomenon of conservation of KE into radiation

23. Two point charges +q and –q are placed at points A and B respectively separated by a small distance. The

electric field intensity at the midpoint O of AB

(a) is zero (b) acts along AB

(c) acts along BA (d) acts perpendicular to AB

24. The power loss is less in transmission lines, when

(a) voltage is less but current is more (b) both voltage and current are more

(c) voltage is more but current is less (d) both voltage and current are less

25. Polarising angle for water is 53o4’. If light is incident at this angle on water and reflected, the angle of

refraction is

(a) 126o 56’ (b) 36o 56’ (c) 30o (d) 36o 20’

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26. 1 Curie is

(a) activity of 1 g of uranium (b) 1 disintegration/second

(c) 3.7 x 1010 becquerel (d) 1.6 x 1012 disintegration/second

27. Which of the following devices has a source of emf inside it?

(a) Voltmeter (b) Ammeter (c) Ohmmeter (d) Rectifier

28. An electric dipole of dipole moment ‘p’ is kept parallel to an electric field of intensity ‘E’. The work done in

rotating the dipole through an angle of 90o is

(a) zero (b) – pE (c) pE (d) 2pE

29. The number of de Broglie waves of an electron in the nth orbit of an atom is

(a) n (b) n – 1 (c) n + 1 (d) 2n


A

B Y

C

(a) 0 1 0 (b) 1 0 0 (c) 1 0 1 (d) 1 1 0

PART – II 15 x 3 = 45


31. Define one “Coulomb” on the basis of Coulomb’s law.

32. What is a polar molecule? Give an example.



35. A manganin wire of length 2 m has a diameter of 0.4 mm with resistance of 70 . Find the resistivity of the

material.

36. What are the limitations of a cyclotron?

37. A solenoid of length 1 m and 0.05 m diameter has 500 turns. If a current of 2A passes through the coil,

calculate the coefficient of self induction of the coil.

38. What is meant by rms (effective) value of alternating current?

39. An LC resonant circuit contains a capacitor 400 pF and an inductor 100 H. It is set into oscillations coupled

to an antenna. Calculate the wavelength of the radiated electromagnetic wave.

40. What are Fraunhofer lines?

41. How much should be the voltage of an X – ray tube, so that the electrons emitted from the cathode may give

an X – ray of wavelength 1 Ao after striking the target?

42. What are the two important facts established by Laue experiment?


44. Explain –decay with an example.

45. Write the uses of nuclear reactor.

46. The base current of the transistor is 50 A and collector current is 25 mA. Determine the value of .


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48. Draw summing amplifier circuit using operational amplifier.



PART – III 7 x 5 = 35






currents along the same direction and experience a mutually attractive force of 3.6 x 10–4 N. Find the current

through the conductors. (OR)

A rectangular coil of 500 turns and of area 6 x 10–4 m² is suspended inside a radial magnetic field of


required to produce a deflection of 10o.

55. Explain the energy losses in a transformer. How are they minimized?


57. Explain the spectral series of hydrogen atom. (diagram not necessary)


59. A metallic surface when illuminated with light of wavelength 3333 Ao emits electrons with energies upto


60. Calculate the time required for 60% of a sample of radon to undergo decay. (Given T½ of Radon = 3.8 days)

61. Explain the working of a diode as a half wave rectifier.

62. State the principle of Radar. What are the applications of Radar?

PART – IV 4 x 10 = 40



64. Discuss the motion of a charged particle in a uniform magnetic field.



66. Explain Raman effect with the help of energy level diagram.

67. Explain the working of Ruby Laser with the help of energy level diagram.

68. Explain the construction and working of a Geiger–Muller counter.

69. With a neat circuit diagram, explain the working of a single stage CE amplifier. Draw the frequency response

curve and discuss the results.


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PART – I 30 x 1 = 30


1. In a forward bias characteristic curve, a diode appears as


2. Which of the following devices do not allow DC to pass through?

(a) resistor (b) capacitor (c) inductor (d) all the above

3. e/m of cathode rays

(a) depends on the nature of the cathode (b) depends on the nature of the anode

(c) nature of the gas atoms present in the discharge tube (d) independent of all the above

4. In an X–ray tube, the intensity of the emitted X–ray beam is increased by



5. In an electromagnetic wave the phase difference between electric field E and magnetic field B is

(a) /4 (b) /2 (c) (d) zero



7. The following arrangement performs the logic function of A

o o C B

(a) AND gate (b) OR gate (c) NAND gate (d) EX-OR gate

8. In CE single stage amplifier, the voltage gain at mid frequency is 10. The voltage gain at upper cut off

frequency is

(a) 10 (b) 14.14 (c) 7.07 (d) 20


(a) half life/2 (b) mean life (c) half life (d) twice the mean life

10. In hydrogen atom, which of the following transitions produces a spectral line of minimum wavelength?

(a) 2 1 (b) 6 2 (c) 4 3 (d) 5 2

11. Nuclear fission can be explained by

(a) shell model (b) liquid drop model (c) quark model (d) Bohr atom model

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12. The average energy released per fission is

(a) 200 eV (b) 200 MeV (c) 200 meV (d) 200 GeV

13. Vidicon camera tube works on the principle of

(a) photo conductivity (b) thermoelectric effect (c) thermionic emission (d) seeback effect



15. The unit of grating element is

(a) no unit (b) metre (c) metre–1 (d) degree

16. The refractive index of the medium for the polarising angle 60o is

(a) 1.732 (b) 1.414 (c) 1.5 (d) 1.468

17. In the case of insulators, as the temperature increases, resistivity


18. In a series RLC AC circuit, the instantaneous values of current and emf are i = Io sin(t – /3) and e = Eo sint

respectively. The phase difference between current and voltage is

(a) zero (b) 180o (c) 60o (d) 45o

19. The total flux over a closed surface enclosing a charge q (in Nm2C–1)

(a) 8q (b) 9 x 109 q (c) 36 x 109 q (d) 8.854 x 10–12 q





22. The path difference between two monochromatic light waves of wavelength 4000 Ao is 2 x 10–7m. The phase

difference between them is

(a) (b) 2 (c) 3/2 (d) /2


(a) the current in the thermocouple (b) the time for which current flows

(c) the temperature of the junction (d) the charge that passes through the thermocouple



(c) both a net force and torque (d) neither a net force nor a torque




26. AB is a rod of lead. The end A is heated. A current I is allowed to flow along AB. Now, due to Thomson

effect, in rod AB

(a) heat is absorbed (b) heat is liberated

(c) heat is neither absorbed nor liberated (d) heat is first absorbed and then liberated

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27. The radioisotope used in the treatment of skin disease is

(a) Na24 (b) I131 (c) Fe59 (d) P32

28. The electric field inside the plates of two oppositely charged plane sheets of charge density is

(a) + /2o (b) – /2o (c) /o (d) zero

29. The work function of a photoelectric material is 3.3eV. The threshold frequency will be equal to


30. A DC of 5A produces the same heating effect as an AC of

(a) 50A rms current (b) 5A peak current (c) 5A rms current (d) none of these

PART – II 15 x 3 = 45


31. Define electric potential at a point in an electric field.

32. Calculate the effective capacitive of the capacitors shown in figure.

5F

10F 10F A B


34. List any three applications of superconductors.

35. State Faraday’s first law of electrolysis.

36. In a galvanometer increasing the current sensitivity does not necessarily, increase the voltage sensitivity.

Explain.

37. Write the equation of a 25 cycle current sine wave having rms value of 30A.


39. Why the centre of the Newton’s rings is dark?

40. What is Tyndal scattering?

41. Give the applications of Moseley’s law.

42. Find the minimum wavelength of X–rays produced by an X–ray tube at 1000 kV.

43. Define threshold frequency.

44. The half life of 84Po218 is 3 minutes. What percentage of the sample has decayed in 15 minutes?

45. Define Curie.

46. What are the different methods of doping a semiconductor?

47. What is Zener breakdown?

48. Draw the circuit diagram of summing amplifier using an operational amplifier.

49. In a common base transistor circuit IC = 0.97 mA and IB = 30 A. Calculate the value of () the current gain.


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PART – III 7 x 5 = 35


51. Derive an expression for capacitance of a parallel plate capacitor with a dielectric medium.


53. The resistance of a field coil measures 50 at 20ºC and 65 at 70ºC. Find the temperature coefficient of

resistance.

54. A moving coil galvanometer of resistance 20 produces full-scale deflection for a current of 50 mA. How will

you convert the galvanometer into (i) an ammeter of range 20 A and (ii) a voltmeter of range 120 V.


56. A plane transmission grating has 5000 lines/cm. Calculate the angular separation in second order spectrum

of red line 7070 Ao and blue line 5000 Ao. (OR)

A 300 mm long tube containing 60 cc of sugar solution produces a rotation of 9o when placed in a

polarimeter. If the specific rotation is 60o, Calculate the quantity of sugar contained in the solution.

57. Obtain the expression for the radius of the nth orbit of an electron based on Bohr’s theory.



60. Explain the properties of neutrons.


62. What are the merits of satellite communication?

PART – IV 4 x 10 = 40


63. State Gauss’s law. Applying this, calculate electric field due to an infinitely long straight charged wire with

uniform charge density.

64. Explain in detail, the principle, construction and working of a cyclotron.

65. With a neat diagram describe the principle, construction and working of a single phase AC generator.

66. What is emission and absorption spectra? Explain the different types of emission and absorption spectra

with examples.

67. With the help of energy level diagram, explain the working of He – Ne laser.

68. What are Cosmic rays? Explain the latitude and altitude effect of cosmic rays.



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PART – I 30 x 1 = 30


1. The first excitation potential energy or the minimum energy required to excite the atom from the ground state

of hydrogen atom is

(a) 13.6 eV (b) 10.2 eV (c) 3.4 eV (d) 1.89 eV

2. Isotopes have

(a) same mass number but different atomic number (b) same proton number and neutron number

(c) same proton number but different neutron number (d) same neutron number but different proton number


(a) is less than its rest length (b) is same as its rest length

(c) is more than its rest length (d) all the above

4. Improper biasing of a transistor circuit produces

(a) heavy loading of emitter current (b) distortion in the output signal

(c) excessive heat at collector terminal (d) faulty location of load line

5. In Millikan’s oil drop experiment, charged oil drop moves under the influence of electric field. Now the

viscous force

(a) is zero (b) acts downwards

(c) acts upwards (d) acts first upwards and then downwards







(c) power is transmitted along the electric field

(d) power is transmitted along the magnetic field


(a) the ground wave propagation (b) the line of sight direction

(c) ionospheric propagation (d) the curvature of the earth

9. Phosphor – Bronze wire is used for suspension in a moving coil galvanometer, because it has



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10. The binding energy per nucleon of 26Fe56 nucleus is


11. The repulsive force between two like charges of 1 coulomb each separated by a distance of 1 m in vacuum

is equal to

(a) 9 x 109 N (b) 109 N (c) 9 x 10–9 N (d) 9 N

12. A light of wavelength 6000 Ao is incident normally on a grating 0.005 m wide with 2500 lines. Then the

maximum order is

(a) 3 (b) 2 (c) 1 (d) 4

13. In Raman effect, if the scattered photon gains energy, it gives rise to

(a) Stokes line (b) Anti-stokes line

(c) Stokes and Anti-stokes lines (d) Rayleigh line

14. The work function of a photoelectric material is 3.3 eV. The threshold frequency will be equal to


15. Lenz’s law is in accordance with the law of

(a) conservation of charges (b) conservation of flux

(c) conservation of momentum (d) conservation of energy

16. After pumping process in laser

(a) the number of atoms in the ground state is greater than the number of atoms in the excited state

(b) the number of atoms in the excited state is greater than the number of atoms in the ground state

(c) the number of atoms in the ground state is equal to the number of atoms in the excited state

(d) no atoms are available in the excited state


(a) C²N–1m–2 (b) Nm²C–2 (c) Hm–1 (d) NC–2m–2


(a) q1q2 /4εor² (b) q1q2 /4εor (c) pE cos (d) p E sin

19. The unit of electrochemical equivalent is

(a) kg.coulomb (b) kg/ampere (c) kg/ampere sec (d) coulomb/kg


(a) field magnets (b) split rings (c) slip rings (d) brushes


A o o

B(a) NOT gate (b) EX–OR gate (c) OR gate (d) AND gate

22. The coolent used in fast breeder reactor is

(a) light water (b) heavy water (c) liquid sodium (d) liquid helium

23. According to Focault and Michelson experiment the velocity of light in a rarer medium is

(a) greater than in a denser medium (b) lesser than in a denser medium

(c) equal to that in a denser medium (d) either greater or lesser than in a denser medium

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24. The angle between the area (A) and A is

(a) 0 (b) (c) /2 (d) 3/2

25. In a tangent galvanometer, for a constant current, the deflection is 30o. The plane of the coil is rotated

through 90o. Now, for the same current, the deflection will be

(a) 30o (b) 60o (c) 90o (d) 0o

26. Maser materials are

(a) diamagnetic ions (b) paramagnetic ions (c) ferromagnetic ions (d) dia & ferromagnetic ions

27. The ionization power is maximum for

(a) neutrons (b) – particles (c) – rays (d) – particles

28. In CE single stage amplifier if the voltage gain at mid-frequency is AM, then the voltage gain at lower cut off

frequency is

(a) AM / 2 b) 2 AM (c) √2 / AM (d) AM / 2


(a) to avoid flicker in the picture (b) the fact that handling of higher frequencies is easier

(c) that 50Hz is the power line frequency in India (d) to avoid unwanted noises in the signal

30. In RLC series AC circuit, the phase difference between current and voltage is 30o. The reactance of the circuit

is 17.32 . The value of resistance is

(a) 30 (b) 10 (c) 17.32 (d) 1.732

PART – II 15 x 3 = 45


31. Define electric potential at a point in an electric field.

32. What is non-polar molecule? Give any two examples.

33. The resistance of a nichrome wire at 0ºC is 10 . If the temperature coefficient of resistance is 0.004/oC, find


34. What is superconductivity?


36. A conductor of length 50 cm carrying a current of 5 A is placed perpendicular to a magnetic field of induction

2 x 10–3 T. Find the force on the conductor.


38. A capacitor of capacitance 2 F is in an AC circuit of frequency 1000 Hz. If the rms value of applied emf is

10 V, find the effective current flowing in the circuit.

39. Why the sky appears blue in colour?



42. An X–ray diffraction of a crystal gave the closest line at an angle of 6o27’. If the wavelength of X–ray is

0.58Ao, find the distance between the two cleavage planes.


44. Define Curie.

45. State radioactive law of disintegration.

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46. What is an extrinsic semiconductor?

47. Draw the circuit diagram of NOT gate using a transistor.

48. What are universal gates? Why are they called so?

49. Prove the following logic expression (A+B)(A+B) = B.


PART – III 7 x 5 = 35


51. The plates of parallel plate capacitor have an area of 90 cm2 each & are separated by 2.5 mm. The capacitor

is charged by connecting it to a 400 V supply. How much electrostatic energy is stored by the capacitor?


53. Explain the working of Leclanche cell with a diagram.

54. Explain the conversion of a galvanometer into an ammeter.

55. Obtain an expression for the energy associated with an inductor.

56. A soap film of refractive index 1.33 is illuminated by white light incident at an angle 30o. The reflected light is

examined by spectroscope in which dark band corresponding to the wavelength 6000 Ao is found. Calculate

the smallest thickness of the film.

57. Mention any five properties of X–rays.

58. Describe photoelectric cell and explain its working.

59. Explain time dilation with an example.

60. Calculate the energy released when 1 kg of 92U235 undergoes nuclear fission. Assume, energy per fission is

200 MeV. Avogadro number is 6.023 x 1023. Express your answer in kilowatt hour also. (OR)

A carbon specimen found in a cave contained a fraction of 1/8 of C14 to that present in a living system.

Calculate the approximate age of the specimen. Given T1/2 for 6C14 = 5560 years.

61. Explain the working of a half wave diode rectifier.

62. Mention the merits and demerits of satellite communication.

PART – IV 4 x 10 = 40


63. What is an electric dipole? Derive an expression for the electric field due to an electric dipole at a point along

the equatorial line.

64. Obtain an expression for Magnetic induction due to an infinitely long straight conductor carrying current.

65. Explain the principle, construction & working of a transformer. (Diagram not necessary). Define its efficiency.

66. On the basis of wave theory explain total internal reflection.

67. State the principle and explain J.J. Thomson’s experiment in determining e/m of an electron.

68. Describe the construction & working of a Bainbridge mass spectrometer in determining the isotopic masses.

69. What is an operational amplifier? Explain its working as an inverting amplifier?

70. With the help of a functional block diagram, explain the working of a superheterodyne AM receiver.

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Duration : 3 Hours PHYSICS Maximum : 150 Marks

PART – I 30 x 1 = 30

N.B. : (i) Answer all the questions.(ii) Choose and write the correct answer.

1. If a point lies at a distance ‘x’ from the mid point of the dipole, the electric potential at this point is

proportional to

(a) 1 / x2 (b) 1 / x3 (c) 1 / x4 (d) 1 / x3/2

2. The electric field between the plates of two oppositely charged plane sheets of charge density ‘’ is

(a) + /2o (b) – /2o (c) /o (d) zero

3. What must be the distance between two equal and opposite point charges (say +q and –q) for the

electrostatic force between them to have a magnitude of 16N?

(a) 4 kq (b) q k /4 (c) 4 kq (d) 4k/q

4. The magnitude of the force acting on a charge of 2 x 10–10 C placed in a uniform electric field of 10 Vm–1 is

(a) 2 x 10–9 N (b) 4 x 10–9 N (c) 2 x 10–10 N (d) 4 x 10–10 N

5. When ‘n’ resistors of equal resistance (R) are connected in series and in parallel respectively, then the ratio

of their effective resistance is

(a) 1 : n2 (b) n2 : 1 (c) n : 1 (d) 1 : n

6. Consider a circular coil of radius 10 cm in an air medium. If 5 A current passes through it, what would be the

magnetic induction at its centre?

(a) x 10–5 T (b) x 105 T (c) x 10–15 T (d) x 10–6 T

7. Nichrome wire is commonly used in heating elements because of its

(a) low specific resistance (b) low melting point (c) high specific resistance(d) high conductivity

8. If an emf of 25 V is induced when the current in the coil changes at the rate of 100 As–1, then the coefficient

of self induction of the coil is

(a) 0.3 H (b) 0.25 H (c) 2.5 H (d) 0.25 mH





11. In an AC circuit


(c) the average power dissipation is zero (d) the rms current is 2 times of peak current

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(a) power is equally transferred along electric and magnetic fields




13. The characteristic spectrum of an atom is observed as ____________ spectrum.


14. In Newton’s rings system, when a drop of water is introduced between the glass plate and planoconvex lens,

the observed ring system

(a) contracts (b) expands (c) remains the same (d) none of these

15. Which of the following is a biaxial crystal?

(a) calcite (b) quartz (c) tourmaline (d) topaz

16. A ruby crystal doped with chromium ions


17. The cathode rays are a stream of

(a) electrons (b) positive ions (c) uncharged particles (d) same as canal rays

18. In holography, which of the following is/are recorded in photographic film?

(a) phase only (b) amplitude only (c) phase & amplitude (d) frequency & amplitude


hydrogen atom is

(a) 13.6 eV (b) 10.2 eV (c) 3.4 eV (d) 1.89 eV

20. If the kinetic energy of the moving particle is E, then the de Broglie wavelength is

(a) =mE2h (b) =

hmE2 (c) = h mE2 (d) =

m2Eh



22. Which of the following is used to detect the presence of blocks in blood vessels?

(a) 15P31 (b) 15P32 (c) 26Fe59 (d) 11Na24




(a) half life (b) mean life (c) half life/2 (d) twice the mean life

25. The energy equivalent of 1 amu is

(a) 931 eV (b) 931 V (c) 931 MeV (d) 9.31 MeV

26. The colour of light emitted by a LED depends on



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27. Find the voltage across the resistor 2.7 V

as shown in the figure (silicon diode is used).

(a) 2.4 V (b) 2 V 180

(c) 1.8 V (d) 0.7 V

28. According to the laws of Boolean algebra, the expression (A + AB) is equal to

(a) A (b) AB (c) B (d) A




30. In amplitude modulation, the bandwidth is __________ the signal frequency.


PART – II 15 x 3 = 45


31. Define electric dipole moment. Give its unit.

32. Calculate the potential at a point due to a charge of 4 x 10–7 C located at 0.09 m away from it.

33. What are the changes observed at transition temperature in superconductors?

34. State Kirchoff’s voltage law.

35. An incandescent lamp is operated at 240 V and the current is 0.5 A. What is the resistance of the lamp?

36. Define Peltier coefficient.

37. State Lenz’s law in electromagnetic induction.

38. Magnetic field through a coil having 200 turns and cross sectional area 0.04 m2 changes from 0.1 wbm–2 to

0.04 wbm–2 in 0.02 seconds. Find the induced emf.

39. Give the uses of ultraviolet radiation.

40. What are the necessary conditions for total internal reflection to take place?

41. Distinguish between soft x-rays and hard x-rays.

42. An electron beam passes through a transverse magnetic field of 2 x 10–3 T & an electric field of 3.4 x 104

V/m acting simultaneously. If the path of the electrons remains undeviated, calculate the speed of electrons.

43. Write any three applications of photoelectric cells.



46. What are the essential components of an oscillator? Draw its block diagram.

47. What are the advantages of Integrated Circuits (IC)?

48. Find the output F of the logic circuit given below. A B

F

A C

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49. What are the important characteristics of an operational amplifier?


PART – III 7 x 5 = 35


51. Deduce an expression for the effective capacitance of capacitors of capacitances C1, C2 and C3 connected

in series.

52. Explain the working of Daniel cell with a neat diagram.

53. How will you compare the emf of two cells using a potentiometer?

54. A current of 4A flows through 5 turn coil of a tangent galvanometer having a diameter of 30 cm. If the

horizontal component of Earth’s magnetic induction is 4 x 10–5 T, find the deflection produced in the coil.

55. Obtain an expression for the self-inductance of a long solenoid.

56. In a Newton’s rings experiment the diameter of the 20th dark ring was found to be 5.82 mm and that of the

10th ring 3.36 mm. If the radius of the plano-convex lens is 1 m. Calculate the wavelength of light used.

57. Write any five properties of canal rays.


59. List the uses and limitations of an electron microscope.


92U235. Assume that energy per fission is 200 MeV. (OR)

A piece of bone from an archaeological site is found to give a count rate of 15 counts per minute. A similar

sample of fresh bone gives a count rate of 19 counts per minute. Calculate the age of the specimen.

61. Obtain the relation between the current amplification factors and of a transistor.

62. Draw the block diagram of Amplitude Modulated radio transmitter.

PART – IV 4 x 10 = 40


63. State the principle and explain the construction and working of Van de Graaff generator.



65. Describe the principle, construction and working of a single-phase AC generator.

66. Derive an expression for the bandwidth of interference fringes in Young’s double slit experiment.

67. State Bohr’s postulates. Derive an expression for the radius of nth orbit of hydrogen atom.


69. What is rectification? Explain the working of bridge rectifier. Draw the input and output signals.

70. Explain the function of a vidicon camera tube.

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PART – I 30 x 1 = 30




2. The capacitance of a parallel plate capacitor increases from 5 F to 60 F when a dielectric is filled between


(a) 65 (b) 55 (c) 12 (d) 10

3. A non-polar molecule is placed in an external electric field (E). The induced dipole moment acts

(a) in the direction of E (b) opposite to the direction of E

(c) perpendicular to the direction of E (d) at random

4. Van de Graaff generator works on the principle of

(a) electromagnetic induction and action of points (b) electrostatic induction and action of points

(c) electrostatic induction only (d) action of points only

5. In the case of insulators, as the temperature decreases, resistivity


6. In a thermocouple, the temperature of the cold junction is 20oC, the neutral temperature is 270oC. The


(a) 520oC (b) 540oC (c) 500oC (d) 510oC

7. Fuse wire is an alloy of

(a) Lead and Tin (b) Lead and Copper (c) Aluminium and Tin (d) Lead and Aluminium


(a) Vs A–1 (b) Wb A–1 (c) Ω s (d) all


(a) input current (b) input voltage (c) input power (d) all



11. Eddy current loss in a transformer can be minimised by using a laminated core made of

(a) stelloy (b) mumetal (c) soft iron (d) silicon steel

12. Atomic spectrum should be ____________ spectrum.


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13. In Newton’s ring experiment the radii of the mth and (m + 4)th dark rings are respectively 5 mm and 7 mm.

What is the value of m?

(a) 2 (b) 4 (c) 8 (d) 10

14. A ray of light is incident on a glass plate at its polarising angle. The angle between the incident ray and the

reflected ray is

(a) 57.5° (b) 90° (c) 115° (d) 32.5°

15. In an electromagnetic wave the phase difference between electric field E and magnetic field B is

(a) /4 (b) /2 (c) (d) zero

16. In hydrogen atom, which of the following transitions produce a spectral line of minimum wavelength?

(a) 2 1 (b) 4 1 (c) 6 5 (d) 5 2

17. X-ray is



18. In Millikan’s oil drop experiment, charged oil drop is balanced between the two plates. Now the viscous force

(a) acts downwards (b) acts upwards (c) is zero (d) acts tangentially

19. In Thomson’s experiment, cathode rays moving with a velocity ‘v’ enter perpendicular to an electric field of

intensity ‘E’. The deflection produced by the cathode rays is directly proportional to

(a) v (b) v–1 (c) v2 (d) v–2

20. If 1 kg of a substance is fully converted into energy, then the energy produced is

(a) 9 x 1016 (b) 9 x 1024 J (c) 1 J (d) 3 x 108 J

21. In photoelectric effect, a graph is drawn taking the frequency of incident radiation along X-axis and the

corresponding stopping potential along the Y-axis. The nature of the graph is

(a) a straight line passing through origin (b) a straight line having positive Y-intercept

(c) a straight line having negative Y-intercept (d) a parabola

22. The half life period of N13 is 10.1 minute. Its lifetime is

(a) 5.05 minutes (b) 20.2 minutes (c) 10.1 / 0.6931 minutes (d) infinity


(a) 15P31 (b) 15P32 (c) 26Fe59 (d) 11Na24

24. The nuclear radius of 4Be8 nucleus is

(a) 1.3 x 10–15 m (b) 2.6 x 10–15 m (c) 1.3 x 10–13 m (d) 2.6 x 10–13 m

25. The mean life () and half life (T1/2) of a radioactive element are related as

(a) = 2 T1/2 (b) = T1/2 / 0.6931 (c) = 0.6931 T1/2 (d) = T1/2 / 2


A

B Y

C

(a) 0 1 0 (b) 1 0 0 (c) 1 0 1 (d) 1 1 0

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(a) majority carriers (b) minority carriers (c) Acceptor ions (d) Donor ions

28. Forbidden energy gap for the semiconductors Ge and Si are respectively

(a) 1.1 eV and 0.7 eV (b) 0.7 eV and 1.1 eV (c) 4 eV and 0.7 eV (d) 1.1 eV and 7 eV



30. In AM receiver, if 900 kHz station is tuned, then the local oscillator will have to produce a frequency of

(a) 600 kHz (b) 455 kHz (c) 10.7 MHz (d) 1355 kHz

PART – II 15 x 3 = 45



32. What is meant by dielectric polarisation?



35. A 1.5 V carbon – zinc dry cell is connected across a load of 1000 Ω. Calculate the current and power

supplied to it.

36. What is Ampere’s circuital law?

37. Define rms value of alternating current.

38. 11 kW power is transmitted at 22000 V through a wire of resistance 2 Ω. Calculate the power loss.

39. Why the sky appears blue in colour?


41. State Moseley's law.


43. Write any three uses of photoelectric cells.

44. The isotope 92U238 successively undergoes three -decays and two -decays. What is the resulting isotope?

45. Write the methods of production of artificial radioisotopes.

46. What are extrinsic semi-conductors?

47. Find the voltage at the point B in the figure. (Silicon diode is used) +5V

B 1 k

48. When the negative feedback is applied to an amplifier of gain 50, the gain after feedback falls to 25.

Calculate the feedback ratio.

49. Distinguish between analog signal and digital signal.

50. What is meant by skip zone?

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PART – III 7 x 5 = 35


51. What is a capacitor? Explain the principle of a capacitor.

52. Explain the principle of a potentiometer with a neat diagram.

53. List any five applications of superconductors.

54. A rectangular coil of area 20 cm x 10 cm with 100 turns of wire is suspended in a radial magnetic field of

induction 5 x 10–3 T. If the galvanometer shows an angular deflection of 15o for a current of 1mA, find the

torsional constant of the suspension wire.

55. Mention the applications of eddy current and explain any two of them.



57. Explain the spectral series of hydrogen atom. (Diagram not required)



at rest? (OR)

The rest mass of an electron is 9.1 x 10–31 kg. What will be its mass if it moves with 4/5th of the speed of

light?

60. Explain the principle and working of an atom bomb.


62. Explain the function of FM radio transmitter with neat block diagram.

PART – IV 4 x 10 = 40


63. Derive an expression for electric field due to an electric dipole at a point on its axial line.

64. Explain the motion of a charged particle in a uniform magnetic field & derive an expression for its time period.

65. With the help of a voltage and impedance phasor diagram of RLC series AC circuit, obtain an expression for

(a) the effective voltage (b) the impedance (c) the phase relationship between the current & the voltage.

66. Derive an expression for the bandwidth of interference fringes in Young’s double slit experiment.

67. State Bragg’s law. Explain how a Bragg’s spectrometer can be used to determine the wavelength of xrays.

68. Describe the principle, construction and working of GM counter.

69. Sketch the circuit of a Colpitt’s oscillator and explain its working.

70. Explain the analysis of amplitude modulated wave with frequency spectrum.

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PART – I 30 x 1 = 30


1. Positive rays of the same element produce two different traces in a Bainbridge mass spectrometer. The

positive ions have

(a) same mass with different velocity (b) same mass with same velocity

(c) different mass with same velocity (d) different mass with different velocity



3. Which of the following is a uniaxial crystal?

(a) tourmaline (b) mica (c) topaz (d) selenite

4. The scattering of sunlight by gas molecules in the earth’s atmosphere is

(a) Raman effect (b) –scattering (c) Tyndal scattering (d) Rayleigh scattering

5. Energy equivalent of 1 amu is

(a) 921 MeV (b) 931 MeV (c) 921 eV (d) 931 V

6. The torque on a rectangular coil placed in a uniform magnetic field is large, when

(a) the number of turns is large (b) the number of turns is less

(c) the plane of the coil is perpendicular to the field (d) the area of the coil is small





(a) is same as its rest length (b) is more than its rest length

(c) is less than its rest length (d) may be more or less than or equal to rest length

9. In the pin configuration of IC 741, pin 3 represents

(a) inverting input (b) non-inverting input (c) – Vcc (d) output



11. The fuel used in Kamini nuclear reactor is

(a) 92U235 (b) 92U238 (c) 92Pu239 (d) 92U233

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12. The photoelectric effect can be explained on the basis of

(a) corpuscular theory of light (b) wave theory of light

(c) electromagnetic theory of light (d) quantum theory of light

13. In LCR series AC circuit, the phase difference between current and voltage is 60°. The reactance of the

circuit is 17.32 Ω. The value of resistance is

(a) 30 Ω (b) 17.32 Ω (c) 10 Ω (d) 1.732 Ω





16. If ‘R’ is the Rydberg’s constant, the shortest wavelength of Paschen series is

(a) R/9 (b) 9/R (c) 16/R (d) 25/R

17. Time taken for the light to pass through a glass plate of refractive index 1.5 and thickness 10 cm is

(a) 2 x 10–8 s (b) 2 x 10–10 s (c) 5 x 10–8 s (d) 5 x 10–10 s

18. The average power consumed over one cycle in an AC circuit is

(a) Erms Irms (b) Erms Irms cos (c) Erms Irms sin (d) Eo Io cos


(a) J.J.Thomson (b) Bohr (c) Sommerfeld (d) de Broglie

20. The electric field outside the plates of two oppositely charged plane sheets of charge density

(a) + /2o (b) – /2o (c) /o (d) zero

21. In an AC circuit the applied emf e = Eosin(t + /2) leads the current I = Iosin(t – /2) by

(a) /2 (b) /4 (c) (d) zero


(a) 15P31 (b) 15P32 (c) 11Na23 (d) 11Na24


(a) NC–2 (b) NC (c) Vm–1 (d) Vm

24. A Coolidge tube operates at 24800 V. The maximum frequency of X–radiation emitted from Coolidge tube is



(a) power is equally transferred along electric and magnetic fields




26. The capacitance of a parallel plate capacitor increases from 5 F to 60 F when a dielectric is filled between


(a) 65 (b) 55 (c) 12 (d) 10

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28. After pumping process in laser,

(a) the number of atoms in the ground state is greater than the number of atoms in the excited state

(b) the number of atoms in the excited state is greater than the number of atoms in the ground state

(c) the number of atoms in the ground state is equal to the number of atoms in the excited state

(d) no atoms are available in the excited state

29. For which of the following medium, the value of relative permitivity r = 1?

(a) mica (b) air (c) glass (d) water



PART – II 15 x 3 = 45


31. What is corona discharge? Give its applications.

32. Give the principle of working of a microwave oven.

33. State Ohm's law.


35. In the following circuit find the magnitude A 5 10 V 10 B

and direction of the current.

D 20 V 5 C

36. Define ampere in terms of force between two long parallel current carrying conductors.


38. Two rails of a railway track insulated from each other and the ground are connected to a millivoltmeter. The

train runs at a speed of 180 Km/hr. Vertical component of earth’s magnetic field is 0.2 x 10–4 Wb/m2 and the

rails are separated by 1 m. Find the reading of the voltmeter.

39. List the conditions for sustained interference.

40. In Young’s experiment, the width of the fringes obtained with light of wavelength 6000 Ao is 2 mm. Calculate

the fringe width if the entire apparatus is immersed in a liquid of refractive index 1.33.

41. Give the applications of Moseley’s law.

42. An x-ray diffraction of a crystal gave the closest line at an angle of 6o 27′. If the wavelength of x-ray is

0.58 Ao, find the distance between the two cleavage planes.

43. What are photo-cells? What are its types?

44. The radioactive isotope 84Po214 undergoes a successive disintegration of two –decays and two -decays.


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47. What is an integrated circuit (IC)?

48. Mention any three uses of cathode ray oscilloscope.

49. Prove the Boolean identity : (A+B) (A+C) = A +BC.

50. What is Fax? Mention its use.

PART – III 7 x 5 = 35


51. Derive an expression for the torque acting on the electric dipole when placed in a uniform electric field.

52. Establish a relation between drift velocity and the current flowing through a conductor.


54. In a tangent galvanometer, a current of 1A produces a deflection of 30o. Find the current required to produce

a deflection of 60o.


56. In Young’s double slit experiment, the intensity ratio of two coherent sources are 64 : 1. Calculate the ratio

between maximum and minimum intensities. (OR)

In Young’s experiment a light of frequency 6 x 1014 Hz is used. Distance between the centres of adjacent



58. Derive an expression for de Broglie wavelength of an electron.


60. Explain how carbon-nitrogen cycle can account for the production of stellar energy.


62. Draw the block diagram of a simple RADAR system.

PART – IV 4 x 10 = 40


63. Explain the principle of a capacitor. Deduce an expression for the capacitance of a parallel plate capacitor.





67. Discuss with necessary theory of Thomson’s method to determine the specific charge of an electron.

68. Describe the discovery of neutrons. Mention the properties of neutrons.

69. Explain the input characteristics of an NPN transistor connected in CE mode with the help of a neat diagram.

70. With the help of a functional block diagram explain the operation of a monochrome TV receiver.

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PART – I 30 x 1 = 30


1. The self inductance of a straight conductor is


2. When a material particle of rest mass 'mo' attains the velocity of light, its mass becomes

(a) 0 (b) 2 mo (c) 4 mo (d) infinity

3. When a drop of water is introduced between the glass plate and plano-convex lens in Newton's ring system,

the ring system



4. The average energy released per fission is

(a) 200 eV (b) 200 MeV (c) 200 meV (d) 200 GeV

5. Which of the following particles is a lepton?

(a) electron (b) proton (c) neutron (d) -meson

6. The direction of the electric field in Millikan's oil drop experiment acts

(a) downwards (b) upwards

(c) first upwards then downwards (d) first downwards then upwards

7. The colour of light emitted by LED depends on



8. In an X-ray tube the intensity of the emitted X-ray beam is increased by



9. The nature of the electrostatic force and nuclear force between a proton and a neutron inside a nucleus are

respectively

(a) repulsive & attractive (b) zero & attractive (c) repulsive & repulsive (d) attractive & attractive

10. In an AC circuit, the instantaneous values of emf and current are respectively e = 200 sin(t – /3) ;

i = 10 sin(t + /6) The phase relation between current and voltage is

(a) voltage lags behind current by a phase angle of /3 (b) current leads voltage by a phase angle of /6

(c) current leads voltage by a phase angle of /2 (d) voltage leads current by a phase angle of /2


(a) transverse (b) longitudinal (c) may be (a) or (b) (d) neither (a) nor (b)

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13. Point charges +q, +q, –q and –q are placed at the corners A, B, C and D respectively of a square. O is the

point of intersection of the diagonals AC and BD. The resultant electric field intensity at the point O

(a) acts in a direction parallel to AB (b) acts in a direction parallel to BC

(c) acts in a direction parallel to CD (d) is zero

14. Phosphor – bronze wire is used for suspension in a moving coil galvanometer, because it has



15. In phase modulation

(a) only the phase of the carrier wave varies

(b) only the frequency of the carrier wave varies

(c) both the phase and the frequency of the carrier wave varies

(d) there is no change in the frequency and phase of the carrier wave

16. A coil of area of cross section 0.5 m2 with 10 turns is in a plane, which is perpendicular to a uniform

magnetic field of 0.2 Wb/m2. The flux though the coil is

(a) 100 Wb (b) 10 Wb (c) 1 Wb (d) zero

17. A light of wavelength 4000 Ao after traveling a distance of 2 m produces a phase change of

(a) zero (b) 3 (c) /2 (d) /3


(a) resistor (b) capacitor (c) inductor (d) all the above

19. A logic gate which has an output '1' only when the inputs are complement to each other is


20. In Joule's Calorimeter experiment, when a current of 1 ampere is passed through a coil for a known interval

of time 't', the temperature of water increases from 30oC to 33oC. When a current of 2 A is passed through

the same coil placed in the same quantity of water and for the same time, the temperature of water

increases from 30oC to

(a) 33oC (b) 36oC (c) 39oC (d) 42oC




22. The electrons in the atom of an element which determine its chemical and electrical properties are

(a) valence electrons (b) revolving electrons (c) excess electrons (d) active electrons



24. The unit of molecular polarisability is

(a) C2N–1m (b) Nm2C–1 (c) N–1m–2C2 (d) C–1m2V

25. The stopping potential of a metal surface is independent of

(a) frequency of incident radiation (b) intensity of incident radiation

(c) the nature of the metal surface (d) velocity of the electrons emitted

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26. In hydrogen atom, which of the following transitions produce a spectral line of maximum frequency?

(a) 2 1 (b) 6 2 (c) 4 3 (d) 5 2

27. A graph is drawn taking potential difference across the ends of a conductor along X-axis and current through

the conductor along the Y-axis. The slope of the straight line gives

(a) resistance (b) conductance (c) resistivity (d) conductivity

28. In –decay



29. The ratio of the radii of the first three Bohr orbit is

(a) 1 : 1/2 : 1/3 (b) 1 : 2 : 3 (c) 1 : 4 : 9 (d) 1 : 8 : 27

30. In a plane transmission grating the width of a ruling is 12000 Ao and the width of a slit is 8000 Ao, the grating

element is

(a) 20 m (b) 2 m (c) 200 m (d) 10 m

PART – II 15 x 3 = 45


31. State Coulomb's law in electrostatics.

32. A sample of HCl gas is placed in an electric field of 2.5 x 104 NC−1. The dipole moment of each HCl molecule

is 3.4 x 10−30 C m. Find the maximum torque that can act on a molecule.

33. Define resistivity of a material. Give its unit.



36. State Fleming's left hand rule.

37. An AC generator consists of a coil of 10,000 turns and of area 100 cm2. The coil rotates at an angular speed

of 140 rpm in a uniform magnetic field of 3.6 x 10–2 T. Find the maximum value of the emf induced.


39. On what factors does the amount of optical rotation depend?

40. A plano-convex lens of radius 3 m is placed on an optically flat glass plate and is illuminated by


41. What is ionization potential of an atom?

42. The Rydberg constant for hydrogen atom is 1.097 x 107 m–1. Calculate the long wavelength limit of Lyman

series.

43. Define threshold frequency.

44. Define Curie.

45. What are the precautions to be taken by the people who are working in radiation laboratories?

46. Find the output of the ideal operational amplifier shown in the figure for the input of V in = – 2.5 V DC is 39 k

15 k

Vin Vout

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47. Write the different methods of doping a semiconductor.

48. State De-Morgan's theorems.

49. Draw the circuit diagram of AND gate using diodes.

50. Define modulation factor in amplitude modulation.

PART – III 7 x 5 = 35



52. Obtain the condition for bridge balance in the Wheatstone’s bridge.

53. Find the current flowing across three resistors 3 , 5 and 2 connected in parallel to a 15 V supply. Also

find the effective resistance and total current drawn from the supply. (OR)

The effective resistances are 10 Ω and 2.4 Ω when two resistors are connected in series and in parallel

respectively. What are the resistances of individual resistors?

54. A moving coil galvanometer of resistance 20 produces full-scale deflection for a current of 50 mA. How

you will convert the galvanometer into (a) an ammeter of range 20 A and (b) a voltmeter of range 120 V?



57. Write any five properties of X-rays.

58. Explain Lorentz-Fitzgerald contraction with an example.


60. The binding energy per nucleon for 6C12 nucleus is 7.68 MeV and that for 6C13 is 7.47 MeV. Calculate the

energy required to remove a neutron from 6C13 nucleus.


62. With the help of a block diagram, explain the operation of FM superheterodyne receiver.

PART – IV 4 x 10 = 40



64. Obtain an expression for the magnetic induction at a point due to an infinitely long straight conductor

carrying current.



66. What is emission and absorption spectra? Explain the different types of emission and absorption spectra

with examples. (Diagram not necessary).

67. Explain the working of Ruby Laser with the help of energy level diagram.

68. What are cosmic rays? Explain the latitude and altitude effect of cosmic rays.


70. Explain transmission and reception of RADAR with a block diagram.

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PART – I 30 x 1 = 30


1. Maser material is

(a) diamagnetic ions (b) paramagnetic ions (c) ferromagnetic ions (d) non-magnetic ions

2. The cathode rays are

(a) a stream of electrons (b) a stream of positive ions

(c) a stream of uncharged particles (d) same as canal rays

3. According to Foucault and Michelson experiment, the velocity of light in a rarer medium is

(a) greater than in a denser medium (b) lesser than in a denser medium

(c) equal to that in a denser medium (d) either greater or lesser than in a denser medium

4. The binding energy per nucleon of 26Fe56 nucleus is

(a) 8.8 MeV (b) 88 MeV (c) 493 MeV (d) 413 MeV




6. Q-factor of series resonant circuit is

(a)LC1Q (b)

LC

R1Q (c)

LR1Q (d)

CL

R1Q

7. If the frequency of AC circuit connected with an inductor of inductance 0.03 H only is 50 Hz, then inductive

reactance is

(a) 3.14 (b) 9.42 (c) 3 (d) 6.28

8. The unit of the number of electric lines of force passing through a given area is

(a) no unit (b) NC–1 (c) Nm2C–1 (d) Nm

9. The main purpose of modulation is to

(a) combine two waves of different frequencies

(b) acquire wave shaping of the carrier wave

(c) transmit low frequency information over long distances efficiently

(d) produce side bands

10. In an N-type semiconductor, there are

(a) immobile negative ions (b) no minority carriers

(c) immobile positive ions (d) holes as majority carriers

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(a) Vs A–1 (b) Wb A–1 (c) Ω s (d) all

12. The longest wavelength that can be analysed by a rock salt crystal of spacing d = 2.82 Ao in the first order is

(a) 2.82 Ao (b) 5.64 Ao (c) 11.28 Ao (d) 21.76 Ao

13. The energy of a photon of characteristic X-ray from a Coolidge tube comes from

(a) the KE of the free electrons of the target (b) the kinetic energy of ions of the target

(c) the kinetic energy of the striking electron (d) an atomic transition in the target


(a) neutrons (b) – particles (c) – rays (d) – particles

15. If 1 kg of a substance is fully converted into energy, then the energy produced is

(a) 9 x 1016 J (b) 9 x 1024 J (c) 1 J (d) 3 x 108 J




17. The radio-isotope used in the treatment of skin diseases is

(a) Co60 (b) Na24 (c) Fe59 (d) P32

18. The refractive index of the medium, for the polarising angle 60o is

(a) 1.732 (b) 1.414 (c) 1.5 (d) 1.468





21. According to Snell's law of refraction, is

(a) directly proportional to sin i (b) inversely proportional to sin r

(c) both (a) and (b) (d) independent of (a) and (b)

22. If the length of a copper wire has a certain resistance R, then on doubling the length its specific resistance

(a) will be doubled (b) will become 1/4 th (c) will become 4 times (d) will remain the same

23. In CE single stage amplifier, the voltage gain at mid-frequency is AM. The voltage gain at lower cut-off

frequency is

(a) AM / 2 (b) 2 AM (c) 2 / AM (d) AM / 2

24. Electric field intensity is 400 V m–1 at a distance of 2 m from a point charge. It will be 100 V m–1 at a

distance?

(a) 50 cm (b) 4 cm (c) 4 m (d) 1.5 m



26. Which of the following equation represents Biot-savart law?

(a)2

o

r

ldI

4dB

(b) dB

2o

r

sinldI

4

(c) dB

2o

r

rxIdl

4 (d) dB

3o

r

rxIdl

4

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light?

(a) bands disappear

(b) no change

(c) diffraction pattern becomes narrower and crowded together

(d) diffraction pattern becomes broader and farther apart

28. Two point charges +q1 and +q2 are placed in air at a distance of 2 m apart. One of the charges is moved

towards the other through a distance of 1 m. The work done is

(a)o

21

4qq

(b)o

214

qq2

(c)o

218

qq

(d)o

2116

qq

29. A proton and an -particle are projected with a same velocity normal to a uniform magnetic field. The ratio

of the magnetic Lorenz force experienced by the proton and the -particle is

(a) 1 : 1 (b) 1 : 2 (c) 2 : 1 (d) 1 : 0



PART – II 15 x 3 = 45

N.B. Answer any fifteen questions31. State Gauss's law in electrostatics.


33. Define drift velocity. Give its unit.

34. The resistance of a nichrome wire at 0oC is 10 . If its temperature coefficient of resistance is 0.004/oC, find


35. State Faraday’s laws of electrolysis.

36. Define Thomson coefficient.

37. What is efficiency of a transformer?

38. Calculate the mutual inductance between two coils when a current of 4 A changing to 8 A in 0.5 s in one coil,

induces an emf of 50 mV in the other coil.

39. Mention any three characteristics of electromagnetic waves.

40. A 300 mm long tube containing 60 cc of sugar solution produces a rotation of 9o when placed in a

polarimeter. If the specific rotation is 60o, calculate the quantity of sugar contained in the solution.


42. Write the applications of Mosley’s law.


44. The radioactive isotope 84Po214 undergoes a successive disintegration of two –decays and two -decays.


45. What is a breeder reactor?


47. Write any three advantages of negative feedback?

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48. What is a light emitting diode? Give any one of its uses.

49. Draw the circuit for NOT gate using transistor.

50. Mention any three advantages of fibre optical communication system.

PART – III 7 x 5 = 35


51. Derive an expression for the capacitance of a parallel plate capacitor.

52. Describe the experiment to determine the internal resistance of a cell using voltmeter.

53. Explain the principle of a potentiometer with a neat diagram.





having 5000 lines per centimetre. A second order spectral line is found to be diffracted at an angle 30o. Find

the wavelength of the light. (OR)

In Young’s experiment a light of frequency 6 x 1014 Hz is used. Distance between the centres of adjacent


57. Derive Bragg’s law for x-ray diffraction.



60. Write any five properties of -rays.

61. Describe the action of zener diode as a voltage regulator.

62. What are the merits and demerits of satellite communication system?

PART – IV 4 x 10 = 40


63. What is an electric dipole? Derive an expression for the electric field due to an electric dipole at a point on

the equatorial line.

64. Explain in detail the principle, construction and working of cyclotron.



66. State Huygen's principle. On the basis of wave theory prove the laws of reflection.

67. Draw a neat diagram of He–Ne laser and explain its working with the help of energy level diagram.

68. State the radioactive law of disintegration. Establish the relation N = Noe–t. Derive the relation between half-

life period and decay constant.

69. What is an operational amplifier? With a circuit diagram, explain the working of an operational amplifier as a

summing amplifier.

70. Describe monochrome TV transmission with a block diagram.

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PART – I 30 x 1 = 30



(a) J.J.Thomson (b) Bohr (c) Sommerfeld (d) de Broglie

2. What is the value of Bohr radius?

(a) 5.3 Ao (b) 0.53 Ao (c) 53 Ao (d) 5.03 Ao


light?

(a) bands disappear

(b) no change

(c) diffraction pattern becomes narrower and crowded together

(d) diffraction pattern becomes broader and farther apart

4. The ratio of nuclear density to the density of mercury is about

(a) 1.3 x 1010 (b) 1.3 (c) 1.3 x 1013 (d) 1.3 x 104





7. The rms value of an AC voltage with a peak value of 311 V is

(a) 110 V (b) 220 V (c) 50 V (d) 70.7 V

8. Two capacitances 0.5 F and 0.75 F are connected in parallel. Calculate the effective capacitance of the

capacitor.

(a) 0.80 F (b) 0.70 F (c) 0.25 F (d) 1.25 F




10. The potential barrier for a germanium PN junction is approximately

(a) 0.7 V (b) 0.5 V (c) 0.3 V (d) 0.2 V

11. In RLC circuit when XL = XC, the current

(a) is zero (b) is in phase with the voltage

(c) leads the voltage (d) lags behind the voltage

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12. X-ray is



13. A narrow electron beam passes undeviated through an electric field E = 3 x 104 V/m and an overlapping

magnetic field B = 2 x 10–3 Wb/m2. The electron motion, electric field and magnetic field are mutually

perpendicular. The speed of the electron is

(a) 60 ms–1 (b) 10.3 x 107 ms–1 (c) 1.5 x 107 ms–1 (d) 0.67 x 10–7 ms–1




15. Electron microscope works on the principle of

(a) photoelectric effect (b) particle nature of electrons

(c) wave nature of moving electron (d) dual nature of matter

16. The unit of disintegration constant is

(a) no unit (b) second (c) second–1 (d) curie

17. The coolant used in fast breeder reactor is

(a) light water (b) heavy water (c) liquid sodium (d) liquid helium

18. The refractive index of the medium, for the polarising angle 60o is

(a) 1.732 (b) 1.414 (c) 1.5 (d) 1.468

19. Improper biasing of a transistor circuit produces

(a) heavy loading of emitter current (b) distortion in the output signal

(c) excessive heat at collector terminal (d) faulty location of load line



(c) both a net force and torque (d) neither a net force nor a torque

21. A wave of length '' corresponds to a phase of 2. Calculate the phase when a distance of corresponds to

a phase of .

(a)

x2 (b)

x2

(c)

x2 (d)

x2




(a) an amplifier with feedback (b) a convertor of AC to DC energy




25. Lenz's law is in accordance with the law of conservation of


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28. When the charge given to a capacitor is doubled, its capacitance

(a) increases twice (b) decreases twice (c) increases four times (d) does not change

29. When the number of turns in a galvanometer is doubled, then its current sensitivity

(a) remains constant (b) decreases twice (c) increases twice (d) increases four times

30. The momentum of the electron having wavelength 2 Ao is

(a) 3.3 x 1024 kg ms–1 (b) 6.6 x 1024 kg ms–1 (c) 3.3 x 10–24 kg ms–1 (d) 6.6 x 10–24 kg ms–1

PART – II 15 x 3 = 45


31. What is corona discharge? Write its uses.

32. A point charge causes an electric flux of –6 x 103 Nm2C–1 to pass through a spherical Gaussian surface of

10 cm radius centred on the charge. (i) If the radius of the Gaussian surface is doubled, how much flux will

pass through the surface? (ii) What is the value of charge?

33. State Kirchoff's (i) current law (ii) voltage law.

34. A cell has a potential difference of 6 V in an open circuit, but it falls to 4 V when a current of 2 A is drawn

from it. Find the internal resistance of the cell.

35. Define mobility. Give its unit.

36. Why is nichrome used as heating element?

37. Define coefficient of self induction of a coil. Give its unit.

38. A capacitor of capacitance 2 F is in an AC circuit of frequency 1000 Hz. Find the capacitive reactance of

the capacitor.

39. State Huygen's principle.

40. What are uniaxial and biaxial crystals? Give an example for each.

41. Write any three properties of cathode rays.

42. An x-ray diffraction of a crystal gave the closest line at an angle of 6o 27′. If the wavelength of x-ray is

0.58 Ao, find the distance between the two cleavage planes.

43. Mention the uses of electron microscope.

44. Define critical size and critical mass.

45. Write a note on leptons.

46. What is an intrinsic semiconductor?

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47. What is a light emitting diode? Draw its symbol.

48. Write Barkhausen condition for oscillation.



PART – III 7 x 5 = 35


51. Prove that the energy stored in a parallel plate capacitor is q2/2C.

52. Explain the action of lead-acid accumulator.

53. It two or more resistors are connected in parallel, derive an expression for the effective resistance.

54. A uniform magnetic field of induction 0.5 T acts perpendicular to the plane of the Dees of a cyclotron.

Calculate the frequency of the oscillator to accelerate protons. (mass of proton = 1.67 x 10–27 kg) (OR)

A rectangular coil of 500 turns and of area 6 x 10–4 m2 is suspended inside a radial magnetic field of


required to produce a deflection of 10o.

55. Explain the method of producing induced emf by changing the area enclosed by the coil.

56. In a Newton’s rings experiment the diameter of the 20th dark ring was found to be 5.82 mm and that of the

10th ring 3.36 mm. If the radius of the plano-convex lens is 1 m, calculate the wavelength of light used.

57. Describe laue experiment. What are the facts established by it?


59. Calculate the de-Broglie wavelength of an electron if the speed is 105 m/s.

60. Write any five properties of -rays.

61. Explain how multimeter is used as Ohm-meter. (multimeter diagram is not necessary)

62. Draw the functional block diagram of amplitude modulated radio transmitter.

PART – IV 4 x 10 = 40


63. State the principle and explain the construction and working of Van de Graaff generator.

64. Discuss the motion of a charged particle in a uniform magnetic field.



66. Explain the Raman scattering of light with the help of energy level diagram.

67. State Bohr’s postulates. Derive an expression for the radius of nth orbit of hydrogen atom.

68. Explain the principle, construction and working of a Geiger-Muller counter.

69. Sketch the circuit of Colpitt’s oscillator. Explain its working.


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Physics/1mark/answers 123 Arul Institute

ANSWERS FOR ONE MARK QUESTIONS

MARCH – 2006

1 c 2 b 3 b 4 c 5 b 6 c 7 a 8 a 9 b 10 b

11 b 12 d 13 b 14 c 15 c 16 a 17 b 18 a 19 d 20 d

21 d 22 a 23 a 24 c 25 d 26 c 27 b 28 b 29 b 30 a

JUNE – 2006

1 d 2 c 3 d 4 a 5 N 6 a 7 d 8 b 9 b 10 d

11 d 12 b 13 d 14 b 15 b 16 b 17 d 18 d 19 b 20 b

21 c 22 a 23 d 24 b 25 a 26 c 27 b 28 a 29 d 30 c

OCTOBER – 2006

1 c 2 c 3 a 4 b 5 d 6 d 7 d 8 c 9 b 10 N

11 a 12 d 13 d 14 c 15 d 16 b 17 d 18 b 19 c 20 d

21 a 22 a 23 b 24 c 25 d 26 c 27 d 28 d 29 d 30 a

MARCH – 2007

1 a 2 b 3 a 4 b 5 a 6 b 7 c 8 c 9 c 10 c

11 a 12 a 13 c 14 c 15 d 16 b 17 b 18 a 19 a 20 a

21 d 22 b 23 b 24 a 25 a 26 c 27 d 28 c 29 c 30 a

JUNE – 2007

1 d 2 d 3 a 4 b 5 c 6 a 7 c 8 c 9 c 10 c

11 a 12 b 13 c 14 b 15 b 16 d 17 a 18 a 19 c 20 d

21 b 22 a 23 b 24 d 25 c 26 b 27 c 28 c 29 a 30 a

OCTOBER – 2007

1 c 2 d 3 a 4 b 5 b 6 d 7 d 8 c 9 a 10 d

11 b 12 a 13 b 14 d 15 b 16 a 17 a 18 c 19 d 20 d

21 a 22 b 23 a 24 c 25 d 26 a 27 c 28 b 29 c 30 a

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MARCH – 2008

1 d 2 a 3 b 4 d 5 b 6 c 7 b 8 c 9 b 10 a

11 d 12 a 13 c 14 d 15 b 16 a 17 a 18 c 19 c 20 b

21 a 22 a 23 a 24 a 25 c 26 b 27 c 28 b 29 c 30 d

JUNE – 2008

1 a 2 c 3 c 4 c 5 b 6 c 7 d 8 c 9 a 10 d

11 d 12 d 13 c 14 c 15 d 16 d 17 a 18 a 19 d 20 b

21 b 22 d 23 b 24 b 25 d 26 c 27 a 28 b 29 c 30 b

OCTOBER – 2008

1 a 2 a 3 b 4 c 5 d 6 c 7 d 8 a 9 b 10 d

11 a 12 c 13 b 14 a 15 c 16 b 17 d 18 d 19 a 20 b

21 c 22 b 23 b 24 b 25 c 26 a 27 d 28 c 29 b 30 d

MARCH – 2009

1 b 2 a 3 a 4 b 5 b 6 c 7 d 8 c 9 b 10 c

11 b 12 a 13 c 14 c 15 a 16 a 17 d 18 c 19 d 20 b

21 d 22 a 23 a 24 d 25 b 26 d 27 b 28 a 29 b 30 b

JUNE – 2009

1 d 2 a 3 c 4 d 5 a 6 a 7 b 8 b 9 c 10 b

11 c 12 b 13 b 14 d 15 b 16 a 17 a 18 c 19 b 20 b

21 a 22 c 23 b 24 d 25 c 26 c 27 c 28 a 29 b 30 c

OCTOBER – 2009

1 a 2 d 3 c 4 b 5 a 6 c 7 a 8 d 9 a 10 d

11 b 12 c 13 d 14 a 15 d 16 d 17 c 18 a 19 c 20 b

21 c 22 c 23 c 24 c 25 d 26 d 27 c 28 a 29 c 30 a

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MARCH – 2010

1 d 2 a 3 d 4 b 5 d 6 c 7 c 8 b 9 b 10 c

11 b 12 a 13 c 14 d 15 b 16 c 17 a 18 c 19 d 20 d

21 c 22 c 23 a 24 b 25 a 26 c 27 a 28 c 29 b 30 d

JUNE – 2010

1 c 2 b 3 a 4 c 5 c 6 b 7 d 8 a 9 b 10 c

11 b 12 a 13 b 14 d 15 c 16 d 17 a 18 d 19 b 20 b

21 b 22 b 23 d 24 b 25 c 26 c 27 d 28 a 29 a 30 b

OCTOBER – 2010

1 a 2 c 3 b 4 d 5 c 6 a 7 a 8 b 9 a 10 d

11 b 12 c 13 d 14 d 15 b 16 c 17 d 18 a 19 d 20 b

21 b 22 c 23 a 24 c 25 b 26 c 27 c 28 a 29 c 30 b

MARCH – 2011

1 d 2 a 3 a 4 b 5 a 6 d 7 c 8 c 9 a 10 d

11 d 12 a 13 c 14 a 15 b 16 a 17 c 18 d 19 a 20 a

21 a 22 d 23 a 24 b 25 b 26 d 27 d 28 c 29 a 30 d

JUNE – 2011

1 b 2 a 3 c 4 a 5 b 6 d 7 d 8 b 9 b 10 a

11 d 12 d 13 d 14 b 15 b 16 a 17 c 18 c 19 b 20 c

21 d 22 a 23 b 24 b 25 c 26 c 27 a 28 c 29 c 30 a

OCTOBER – 2011

1 d 2 a 3 b 4 a 5 b 6 d 7 b 8 a 9 b 10 c

11 c 12 a 13 d 14 c 15 c 16 b 17 b 18 c 19 d 20 b

21 a 22 d 23 c 24 a 25 a 26 b 27 b 28 d 29 c 30 b

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MARCH – 2012

1 c 2 a 3 d 4 b 5 d 6 c 7 b 8 d 9 d 10 d

11 b 12 d 13 c 14 a 15 c 16 b 17 a 18 c 19 a 20 b

21 a 22 b 23 b 24 c 25 b 26 a 27 b 28 c 29 b 30 c

JUNE – 2012

1 c 2 c 3 b 4 a 5 c 6 c 7 b 8 d 9 a 10 b

11 c 12 a 13 d 14 b 15 b 16 c 17 a 18 c 19 b 20 d

21 b 22 d 23 a 24 a 25 d 26 d 27 a 28 c 29 a 30 d

OCTOBER – 2012

1 d 2 a 3 c 4 d 5 a 6 b 7 d 8 c 9 a 10 b

11 a 12 c 13 b 14 c 15 d 16 b 17 a 18 b 19 d 20 a

21 c 22 c 23 b 24 d 25 c 26 b 27 c 28 b 29 a 30 b

MARCH – 2013

1 c 2 c 3 b 4 a 5 d 6 a 7 b 8 c 9 d 10 c

11 a 12 d 13 c 14 c 15 c 16 b 17 c 18 a 19 b 20 b

21 b 22 d 23 b 24 c 25 b 26 c 27 c 28 c 29 a 30 c

JUNE – 2013

1 d 2 b 3 d 4 a 5 d 6 d 7 a 8 c 9 b 10 a

11 b 12 b 13 a 14 b 15 b 16 a 17 a 18 c 19 c 20 b

21 a 22 a 23 c 24 d 25 c 26 c 27 d 28 c 29 a 30 c

OCTOBER – 2013

1 b 2 c 3 a 4 b 5 b 6 c 7 b 8 c 9 d 10 a

11 a 12 a 13 b 14 a 15 d 16 b 17 a 18 b 19 c 20 d

21 c 22 c 23 a 24 c 25 d 26 b 27 b 28 d 29 a 30 a

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MARCH – 2014

1 a 2 c 3 b 4 a 5 b 6 a 7 c 8 b 9 a 10 b

11 a 12 b 13 a 14 a 15 d 16 b 17 a 18 c 19 b 20 a

21 a 22 d 23 c 24 b 25 c 26 d 27 b 28 a 29 c 30 b

JUNE – 2014

1 a 2 c 3 a 4 b 5 b 6 a 7 a 8 d 9 c 10 d

11 a 12 a 13 d 14 c 15 d 16 b 17 a 18 c 19 d 20 a

21 c 22 d 23 c 24 b 25 b 26 c 27 b 28 b 29 b 30 d

OCTOBER – 2014

1 c 2 b 3 a 4 d 5 b 6 a 7 c 8 c 9 b 10 d

11 d 12 d 13 c 14 a 15 a 16 b 17 d 18 b 19 c 20 d

21 c 22 b 23 c 24 a 25 b 26 c 27 d 28 b 29 b 30 d

MARCH – 2015

1 a 2 d 3 a 4 b 5 a 6 a 7 d 8 a 9 b 10 c

11 a 12 d 13 b 14 d 15 c 16 c 17 a 18 b 19 d 20 d

21 c 22 a 23 b 24 a 25 b 26 a 27 b 28 d 29 c 30 b

JUNE – 2015

1 b 2 a 3 a 4 a 5 b 6 d 7 b 8 c 9 c 10 c

11 d 12 b 13 d 14 b 15 a 16 a 17 d 18 a 19 d 20 a

21 d 22 d 23 d 24 c 25 d 26 d 27 c 28 c 29 b 30 d

OCTOBER – 2015

1 c 2 b 3 c 4 c 5 b 6 d 7 b 8 d 9 b 10 c

11 b 12 a 13 c 14 a 15 c 16 c 17 c 18 a 19 b 20 d

21 a 22 d 23 a 24 d 25 d 26 b 27 d 28 d 29 c 30 c

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