1. 1. 1. 1. Name of the prefix for 10 -18 isA. A. A. A. gigaB. B. B. B. femtoC. C. C. C. hectoD. D. D. D. atto2. 2. 2. 2. Thin film of soap solution is formed but not with that of waterA. A. A. A. Surface tension of water is more than that of soap solutionB. B. B. B. Density of water is more than that of soap solutionC. C. C. C. Surface tension of water is less than that of soap solutionD. D. D. D. Density of water is less than that of soap solution3. 3. 3. 3. Water molecules cling to wooden stick when removed from water is due toA. A. A. A. capillarityB. B. B. B. force of attractionC. C. C. C. force of adhesionD. D. D. D. force of cohesion4. 4. 4. 4. A glass tube of 1.0 m length is filled with water. The water can be drained out slowly at the bottom of the tube. If a vibrating tuning fork of frequency 500 c/s is brought at the upper end of the tube and the velocity of sound is 330 m/s, then the total number of resonances obtained will beA. A. A. A. 4B. B. B. B. 3C. C. C. C. 2D. D. D. D. 15. 5. 5. 5. Two identical straight wires are stretched so as to produce 6 beats / s, when vibrating simultaneously. On changing the tension slightly in one of them, the beat frequency remains unchanged denoting by T1 and T2 the higher and lower initial tension in the strings, then it would be said while making the above change in tensionA. A. A. A. T2 was decreasedB. B. B. B. T1 was increasedC. C. C. C. T2 was increasedD. D. D. D. T1 was decreased6. 6. 6. 6. Two sounding bodies producing progressive waves given by y1 = 4 sin 400 πt ; y2 = 3 sin 404 πt are situated very near to the ears of a person who will hearA. A. A. A. 2 beats per second with intensity ratio (4/3) between maxima and minimaB. B. B. B. 2 beats per second with intensity ratio (49/1) between maxima and minimaC. C. C. C. 4 beats per second with intensity ratio (7/1) between maxima and minimaD. D. D. D. 4 beats per second with intensity ratio (4/3) between maxima and minima7. 7. 7. 7. When a star approaches the earth, the lines are shifted towardsAAAA.... green colourBBBB.... yellow colour

C. C. C. C. blue endD. D. D. D. red end8. 8. 8. 8. The pitch of the whistle of an engine appears to drop to 5/6th of the original value, when it passes a stationary observer. If the speed of sound in air is 350 m/s, the speed of the engine isA. A. A. A. 70 m/sB. B. B. B. 100 m/sC. C. C. C. 32 m/sD. D. D. D. 350 m/s9. 9. 9. 9. The temperature at which velocity of sound in nitrogen is equal to its velocity in oxygen at 20º C isA. A. A. A. 0ºCB. B. B. B. - 7ºCC. C. C. C. - 17ºCD. D. D. D. - 24ºC10. 10. 10. 10. The maximum tolerable sound intensity in dB isA. A. A. A. 100 dBB. B. B. B. 200 dBC. C. C. C. 120 dBD. D. D. D. 10 dB11. 11. 11. 11. In partial reflection from a membrane, with the same medium on both sides, an incident wave of amplitude A is reflected and transmitted with amplitudes B & C respectively. If B == C/2, and energy loss be negligible, the value of B should beA. A. A. A. 3

2AB. B. B. B. 3AC. C. C. C. 5

AD. D. D. D. 54

A12. 12. 12. 12. In a sonometer experiment, the bridges are separated by a fixed distance. The wire which may be slightly elastic emits a tone of frequency n when held by a tension T. If the tension is increased to 4T, the tone emitted by the wire will be of frequencyA. A. A. A. nB. B. B. B. 2nC. C. C. C. slightly greater than 2nD. D. D. D. slightly less than 2n11113333.... A pipe open at both ends produces a note of frequency f1 When the pipe is kept with 2/3rd of its

is2f1fratio The f2.frequency of note a producesit in water,length

A. A. A. A. 21B. B. B. B. 3/2C. C. C. C. 2/3D. D. D. D. 2/1

14. 14. 14. 14. next theand node abetween distance The t.96 cos15

xπsin 4 y wavestationary For the π

=

antinode isA. A. A. A. 7.5B. B. B. B. 15C. C. C. C. 22.5D. D. D. D. 3015. 15. 15. 15. Binoculars are made short by using right angled isosceles prisms of glass The number of such prisms areA. A. A. A. 1B. B. B. B. 2C. C. C. C. 3D. D. D. D. 416. 16. 16. 16. A circular patch of light is formed due to a point source kept at depth t from the surface of of water. If the critical angle of the medium is 30º, then the radius of circular patch isA. A. A. A. 2tB. B. B. B. 3tC. C. C. C. t2D. D. D. D. t317. 17. 17. 17. A lens forms a sharp image on a screen. On inserting a parallel sided slab between the lens and the screen, it is found necessary to move the screen a distance d away from the lens in order to focus the image sharply. If R.I of glass is n, then the thickness of the glass slab is given byA. A. A. A. ndB. B. B. B. ndC. C. C. C. 1n

nd−D. D. D. D. n

d1)(n −

18. 18. 18. 18. The Refractive index of glass for Indigo and fed light are 1.53 and 1.51 respectively. If the angle of prism is 10º, the

angular dispersion isA. A. A. A. 0.02ºB. B. B. B. 0.2ºC. C. C. C. 0.153ºD. D. D. D. 0.151º19. 19. 19. 19. For a glancing angle of 30º it is found that reflected beam is completely plane polarised. The R.I. of glass isA. A. A. A. 3B. B. B. B. 1.5C. C. C. C. 2D. D. D. D. 320. 20. 20. 20. In a certain region A to B in a thin film, we get 10 fringes in the reflected beam of wavelength ]λ = 4600 Å. How many fringes will be observed in the same region with λ = 6571 ÅA. A. A. A. 3B. B. B. B. 7C. C. C. C. 15D. D. D. D. 2421. 21. 21. 21. According to the corpuscular theory, different colours of light are due to different of corpusclesA. A. A. A. sizesB. B. B. B. chargesC. C. C. C. velocitiesD. D. D. D. colours22. 22. 22. 22. In a Fraunhoffer diffraction experiment at a single slit using light of wavelength 400 nm, the first minimum is formed at an angle, of 30º. Then the direction θ of the first secondary maximum is given byA. A. A. A.

−

34

tan 1B. B. B. B. 60ºC. C. C. C.

−

43

sin 1D. D. D. D.

−

43

tan 1

23. 23. 23. 23. The angle between the plane of vibration & plane of polarisation isA. A. A. A. 90ºB. B. B. B. 45ºC. C. C. C. 0ºD. D. D. D. 180º

24. 24. 24. 24. If visual acuity of eye is 2 minute of an arc, the distance from an observer, at which the 2 head lights of a jeep separated by a distance 1 m appear single isA. A. A. A. 1 kmB. B. B. B. 2 kmC. C. C. C. 3 kmD. D. D. D. 4 km25. 25. 25. 25. Three point charges 4 nC, 6 nC and 5 nC are placed at the corners A, B and C of a square ABCD. Find what charge must be placed at the corner D of the square so that the net potential at the centre of the square is zero

A B

CD+ q

+ 2q

O

- 2q

+ q

A. A. A. A. -15 nCB. B. B. B. 15 nCC. C. C. C. 5 nCD. D. D. D. 3 nC26. 26. 26. 26. isο

∑typermittivi electric of whit TheA. A. A. A. volt/mB. B. B. B. coulomb m2C. C. C. C. coulomb faradD. D. D. D. farad/meter27. 27. 27. 27. The electron charge is 1.6 × 10 - 19 C. If a body carries a negative charge of 9.6 × 10-10 C the number of excess electrons of the body isA. A. A. A. 6 × 1029B. B. B. B. 1/6 × 10 - 29C. C. C. C. 6 × 10 - 29D. D. D. D. 6 × 10928. 28. 28. 28. The energy stored per unit volume of a parallel plate air capacitor is 4.427 J/m3. If the potential difference between its plates is 1000 V, the distance between the plates isA. A. A. A. 2 mmB. B. B. B. 1 mmC. C. C. C. 0.6 mmD. D. D. D. 0.23 mm29. 29. 29. 29. Two condensers of capacity 2 C and C are joined in parallel and charged upto potential V. The battery is removed and the condenser of capacity C is filled completely with a medium of dielectric constant K. The p.d. across the

capacitors will now beA. A. A. A. 2K3V+B. B. B. B. K

3VC. C. C. C. 2KV+D. D. D. D. K

V30. 30. 30. 30. A parallel plate capacitor is charged and charging battery is then disconnected. If the plates of the capacitor are moved further apart by means of insulating handlesA. A. A. A. the charge on the capacitor increasesB. B. B. B. the voltage across the plate increasesC. C. C. C. the capacitance increasesD. D. D. D. the electrostatic energy stored in the capacitor decreases31. 31. 31. 31. In the circuit shown along side the final voltage drop across the capacitor C is

C

1r

3r

2r

V

A. A. A. A. 21

2

rr

Vr

+B. B. B. B. 321

12

rrr

)r(rV

++

+

C. C. C. C. 21

1

rr

Vr

+D. D. D. D. 2

21

r

)r(rV +

32. 32. 32. 32. Two capacitors of capacity 1 µF and 2 µF respectively are connected in series. The combination is connected across a potential of 6V. The ratio of energies stored by the condenser will beA. A. A. A. 1 : 2B. B. B. B. 1 : 4C. C. C. C. 2 : 1D. D. D. D. 4 : 1

33. 33. 33. 33. A 1 cm - cube of material of wire is stretched into a wire of length 3 m. If the resistivity of the material is 21 × 10-8 Ω.m. the resistance of the wire isA. A. A. A. 3 ΩB. B. B. B. 6.3 ΩC. C. C. C. 9 ΩD. D. D. D. 1.89 Ω34. 34. 34. 34. Thermistors are used to measureA. A. A. A. very low temperatureB. B. B. B. very high temperatureC. C. C. C. any range of temperatureD. D. D. D. around 100ºC35. 35. 35. 35. The resistance of a wire at 0ºC and 100ºC are 8 Ω and R. If α = 0.0008 / ºC then R is (in ohms)A. A. A. A. 0.864B. B. B. B. 864C. C. C. C. 86.4D. D. D. D. 8.6436. 36. 36. 36. An electric lamp is marked 100 W, 220 V. The cost of 1 kW - hour of power is Rs. 2.00. The cost of using this lamp for 8 hours / day for 30 days isA. A. A. A. Rs. 24B. B. B. B. Rs. 48C. C. C. C. Rs. 12D. D. D. D. Rs. 637. 37. 37. 37. How many times will the total resistance of n identical conductors be reduced if their series arrangement is changes to parallel arrangement?A. A. A. A. 1/nB. B. B. B. n1/C. C. C. C. 1/n2D. D. D. D. 1/n338. 38. 38. 38. The vector form of Biot Savart's law for a current element is

A. A. A. A. 3ο

r

rδiπ4

µδB

∧→

→×

=l

B. B. B. B. 2ο

r

rδiπ4

µδB

∧→

→×

=l

C. C. C. C. 2ο

r

r.δiπ4

µδB

∧→

→

=l

D. D. D. D. 3ο

r

r.δiπ4

µδB

∧→

→

=l

39. 39. 39. 39. If a wire is placed parallel to the lines of force in a magnetic field and a current flows in the wire thenA. A. A. A. the wire will experience a force in a direction perpendicular to the lines of forceB. B. B. B. the wire will not experience any force at allC. C. C. C. the wire will experience a force in a direction opposite to the fieldD. D. D. D. none of these40. 40. 40. 40. The plane of coil of a tangent galvanometer is arranged in the magnetic meridianA. A. A. A. to avoid the magnetic effect of earth's fieldB. B. B. B. to produce intense magnetic field at the centre of the coilC. C. C. C. to produce a field at right angles to the earth's fieldD. D. D. D. to avoid error due to parallax41. 41. 41. 41. The coil of a suspended coil galvanometer has very high resistance. When a momentary current is passed through the coil itA. A. A. A. oscillates with same amplitudeB. B. B. B. oscillates with decreasing amplitudeC. C. C. C. shows steady deflectionD. D. D. D. gets deflected and comes to rest slowly42. 42. 42. 42. A constant current ‘i' is maintained in a solenoid the quantity, which will not increase if an iron rod is inserted in the solenoid along the axis isA. A. A. A. self inductance of the solenoidB. B. B. B. magnetic field at the centreC. C. C. C. magnetic flux linked with the solenoidD. D. D. D. rate of joule heating43. 43. 43. 43. Equation of alternating voltage is V = 4 cos (ωt - π/3) Instantaneous value ofA. A. A. A. 2 VB. B. B. B. 3 VC. C. C. C. V

2

2D. D. D. D. 1 V44. 44. 44. 44. self The R 3 is Hz 50frequency of AC toR resistance of coil a of impedance The

inductance of the coil is (if R = 6.28 Ω)

A. A. A. A. 0.25 HB. B. B. B. 2.5 HC. C. C. C. 0.025 HD. D. D. D. none45. 45. 45. 45. A coil of resistance 20 Ω and inductance 0.5 H is connected to a 120 V D.C. line. The rate at which current in the coil rise at the instant the coil is connected to the line isA. A. A. A. 250 V/sB. B. B. B. 120 V/sC. C. C. C. 60 V/sD. D. D. D. 0.6 V/s46. 46. 46. 46. For the conversion of low voltage dc into a high voltage dc, we useA. A. A. A. transformerB. B. B. B. dynamoC. C. C. C. induction coilD. D. D. D. ac generator47. 47. 47. 47. The angular momentum of the electron in the third Bohr orbit isA. A. A. A. hB. B. B. B. 2π

3hC. C. C. C. 2πhD. D. D. D. 4πh

48. 48. 48. 48. Drawback of Bohr's theory wasA. A. A. A. could not explain fine structure of spectra linesB. B. B. B. nucleus was supposed to be at restC. C. C. C. both quantum and classical theories are used in the explanationD. D. D. D. all the above49. 49. 49. 49. The de-Broglie wavelength associated with proton changes by 0.25% if its momentum is changed by pο. The initial momentum wasA. A. A. A. 100 pοB. B. B. B. 400/p

οC. C. C. C. 401 pοD. D. D. D. 100/pο

50. 50. 50. 50. Which of the following helps in knowing about the stability of a nucleus?A. A. A. A. binding energyB. B. B. B. binding energy per nucleonC. C. C. C. both of the aboveD. D. D. D. none of the above51. 51. 51. 51. According to Yukawa, the nuclear force arises through the exchange of between the nucleonsA. A. A. A. protonsB. B. B. B. positronsC. C. C. C. photonsD. D. D. D. mesons52. 52. 52. 52. Mass number A of a nucleus whose radius is 3.9 fermi isA. A. A. A. 10B. B. B. B. 47C. C. C. C. 27D. D. D. D. 1753. 53. 53. 53. An ideal diode acts like a switch when forward biased and switch when reverse biasedA. A. A. A. open, closedB. B. B. B. open, openC. C. C. C. closed, openD. D. D. D. closed, closed54. 54. 54. 54. A NOT gate hasA. A. A. A. two inputs and two outputsB. B. B. B. two inputs and one outputC. C. C. C. one input and one outputD. D. D. D. one input and two outputs55. 55. 55. 55. Symbol represents

B

yA

•A. A. A. A. NOR gateB. B. B. B. OR gate

C. C. C. C. XOR gateD. D. D. D. NOT gate56. 56. 56. 56. If A = 0, B = 1 Then Y

A

BY

A. A. A. A. 0B. B. B. B. 1C. C. C. C. either 1 or 0D. D. D. D. none57. 57. 57. 57. Body ‘A' contains Q1 amounts of heat and its temperature is T1. Body ‘B' contains Q2 amounts of heat and its temperature is T2. If Q2 > Q1 and T1 > T2, thenA. A. A. A. heat will flow from B to AB. B. B. B. heat will flow from A to BC. C. C. C. heat cannot flow from B to A because Q2 > Q1D. D. D. D. heat will flow from B to A till Q1 becomes equal to Q258. 58. 58. 58. Heat supplied to a gas at constant pressure is utilised toA. A. A. A. increase the internal energyB. B. B. B. do external work against pressureC. C. C. C. both (a) and (b)D. D. D. D. neither (a) nor (b)59. 59. 59. 59. An ideal black - body at room temperature is thrown into a furnace. It is observed thatA. A. A. A. Initially it is the darkest body and at later times it is the brightestB. B. B. B. It is the darkest body at all timesC. C. C. C. It cannot be distinguished at all timesD. D. D. D. Initially it is the darkest body and at later times it cannot be distinguished60. 60. 60. 60. Two metallic rods are of the same material. Their diameters are in the ratio 2 : 1 and their lengths are in the ratio 1 : 4. If the temperature difference between the ends of the rods are same then find out the ratio of the rate of flow of heatA. A. A. A. 2 : 1B. B. B. B. 4 : 1C. C. C. C. 8 : 1D. D. D. D. 16 : 1