1. UPSEE PAST PAPERSPHYSICS - UNSOLVED PAPER - 2001

2. SECTION I Straight Objective Type This section contains multiple choice questions numbered 100 . Each question has 4 choices (A), (B), (C)and (D), out of which ONLY ONE is correct. 3. 01 Problem A sphere, a cube and a thin circular plate, all made of the same material and having the same mass are initially heated to a temperature of 10000C. which one of these will cool first? a. Plate b. Sphere c. Cube d. None of these 4. 02 Problem A beam of light composed of red and green rays is incident obliquely at a point on the face of a rectangular glass slab. When coming out on the opposite parallel face, the red and green rays emerge from: a. Two points propagating in two different non-parallel directions b. Two points propagating in two different parallel directions c. One point propagating in two different directions d. One point propagating in the same directions 5. 03 Problem Two wires having resistances of 2 and 4 are connected to same voltage. The ratio of heat dissipated in the resistances will be : a. 4:3 b. 1:2 c. 5:2 d. 2:1 6. 04 Problem a photon moves to energy level E1 from E2 find more stable nucleus, then the frequency will be : a. Exactly (E2-E1)/h b. Slightly greater than (E2-E1)/h c. Slightly less than (E2-E1)/h d. Hv 7. 05 Problem At 273oC, the emissive power of a perfect black body is R. what is its values at 0oC? a. R/4 b. R/16 c. R/2 d. None of these 8. 06 Problem Among two discs A and B, first have radius 10 cm charges 10-6C and second have radius 30 cm and charges 10-5C. when they are touched, charges on both are qA and qB respectively, will be : a. qA=2.2.75C, qB= 3.15 C b. qA=1.09C,qB=1.53 C c. qA=qB=5.5C d. None of these 9. CV =07 Problem The potential difference between the cathode and the target electrode in a Coolidge tube is 24.75kV. the minimum wavelength of the emitted X-rays is : a. 0.1 b. 0.5 c. 1 d. 5 10. 08 Problem The first named planetoid (ceres) has its orbit in between the orbits of: a. Mars and jupiter b. Neptune and Pluto c. Mercury and Pluto d. Venus and Saturn 11. 09 Problem A torque of 10-5 Nm is required to hold a magnet at 90o with the horizontal component of the hold it at 30o will be: a. 5x10-6Nm b. data is insufficient c. 5 3x10 61 d. x10 53 12. 10 Problem A 220 V, 100 W bulb is joined with a 110 V supply. The power consumed by the bulb is : a. 50W b. 25W c. 80W d. 100W 13. 11 Problem Newtons corpuscular theory could not explain the phenomenon for: a. Reflection b. Refraction c. Diffraction d. Rectilinear propagation 14. 12 Problem Which one of the following statements is correct? a. Conduction is a fast process b. Convection is a fast process c. Radiation is a fast process d. None of above 15. 13 Problem A sample of an ideal gas occupies a volume Vat pressure P and absolute temperature T. the mass of each molecule is m, then the density of the gas is : a. MkT pm b. kT c.pkm d.pkT 16. 14 Problem An air column in a pipe which is closed at one end, will be in resonance with the vibration body of frequency 166 Hz, if the length of the air column is : a. 0.5 m b. 1.0 m c. 1.5 m d. 2.0 m 17. 15 Problem A wave equation which gives the displacement along the direction is given by Y=0.001 sin(100t + x) When x and y are in metre and t I second This equation represents a wave: a. Traveling with a velocity of 100 m/s in the negative x-direction b. Traveling with a velocity of m/s in the positive x-direction c. Of wavelength 1 m d. Of frequency 100/ Hz 18. 16 Problem In order to initiate the surface loading limit, the sides of ships are marked by the lines called: a. Load lines b. Plimosoll lines which has below those for fresh water c. Safety lines d. Danger (or limit) lines 19. 17 Problem A container party filled in a liquid is suspended from a spring of shops balance. A small body is gently dropped in the container in the container. The pointer of spring balance will: a. Read less b. Oscillate c. Read the same d. read more 20. 18 Problem Two particles, initially at rest move towards each other under the effect of gravitational force of attraction. At the instant when their relative velocity is 3v where v the velocity of the slower particle, then the speed of the speed of the center of mass of two given particles is : a. 1v b. 2v c. 3v d. zero 21. 19 Problem A body of mass 10 kg moves with a velocity v of 2 m/s along a circular path or radius 8 m. The power produced by the body will be ; a. 10 J/s b. 98 J/s c. 49 J/s d. zero 22. 20 Problem A ball of mass 0.5 kg is moving with a velocity v of 2 m/s. It is subjected to a force of x Newton in 2 s. Because of this force, the ball moves with velocity of 3 m/s. The value of x is : a. 5 N b. 8.25 N c. 0.25 N d. 1.0 N 23. 21 Problem A thin prism P1 with angle 40 and made from glass of refractive index 1.54 is combined with another prism P2 made of glass of refractive index 1.72 to produce dispersion without deviation. The angle of prism P2 is : a. 5.330 b. 40 c. 2.60 d. 30 24. 22 Problem In a reaction 92Be234 88Y218, the number of -particles emitted respectively, are : a. 4, 4 b. 4, 6 c. 4, 8 d. 4, 2 25. 23 Problem If thermo emf is given by E = at + bt2, then the neutral temperature is : a.a2b b. 2baa c.b d. ba 26. 24 Problem In the following transitions, which one has higher frequency ? a. 31 b. 4 2 c. 43 d. 32 27. 25 Problem If increase in linear momentum of a body is 50%, then change in its kinetic energy is : a. 25% b. 125% c. 150% d. 50% 28. 26 Problem If two soap bubbles of different radii are in contact then : a. Air rushes from smaller bubble to bigger bubble which continues to grow atthe cost of the smaller bubble b. Sizes of the bubbles remain the same c. Air rushes from bigger bubble to smaller bubble until the size of twobecomes same d. None of these 29. 27 Problem The current gain of a transistor in common-base mode is 0.995. Its current gain in the common-emitter mode is : a. 200 b. 90.5 c. 100 d. 1.005 30. 28 Problem A photocell is illuminated by a small bright source placed 2m away. When the same source of light is placed 4 m away, the electrons emitted by photo- cathode in one second a. Carry one quarter of their previous energy b. Carry one quarter of their previous momentum c. Are half numerous d. Are one quarter numerous 31. 29 Problem Two then long parallel wires separated by a distance b are carrying a current i ampere each. The magnitude of the force per unit length exerted by one wire on the other, is : 2 a.0i2bi2 b.02 b2i c.02 b d.0i22 b 32. 30 Problem A conducting wire of cross-sectional area 1 cm2 has 3 x 1023 charge carriers per metre3. If wire carries a current 24 mA, then drift velocity of carriers is : a. 5 x 10-2 m/s b. 0.5 m/s c. 5 x 10-3 m/s d. 5 x 10-6 m/s 33. 31 Problem The capacitance of a metallic sphere is 1F, then its readius is nearly : a. 1.11 m b. 10 m c. 9 km d. 1.11 cm 34. 32 Problem For a projectile (range)2 is 48 times of (maximum height)2 obtained. Find the angle of projection. a. 600 b. 300 c. 450 d. 750 35. 33 Problem At room temperature, the rms speed of the molecules of certain diatomic gas is found to be 1933 m/s. The gas is : a. H2 b. F2 c. Cl2 d. O2 36. 34 Problem The refractive index of a piece of transparent quartz is greatest for : a. Violet light b. Green light c. Yellow light d. Red light 37. 35 Problem The equation of longitudinal wave is represented as y = 20 cos (50t - x) cm Then its wavelength is : a. 120 cm b. 50 cm c. 2 cm d. 5 cm 38. 36 Problem With the increase of temperature, the surface tension of the liquid : a. may increase of decrease depending on the density of liquid b. remains the same c. always increases d. always decreases 39. 37 Problem A force of 6 x 106 Nm-2 is required for breaking a material. The density of the material is 3 x 103 kg m-3. If the wire is to break under its own weight, the length of the wire made of that material should be : (take g =10 ms-2) a. 20 m b. 200 m c. 100 m d. 2000 m 40. 38 Problem The escape velocity of a rocket launched from the surface of the earth : a. Depends on the mass of the rocket b. Depends on the mass of the planet towards which, it is moving c. Does not depend on the mass of earth d. Does not depend on the mass of rocket 41. 39 Problem A stone is released from a tower, its total energy during its fall : a. Increases b. Decreases c. Remains constant d. First increases then remains constant 42. 40 Problem A ball falls from 20 m height on floor and rebounds to 5 m. Time of contact is 0.02 s. Find acceleration during impact : a. 1200 m/s2 b. 1000 m/s2 c. 2000 m/s2 d. 1500 m/s2 43. 41 Problem One metre long metal rod of silver at 00C is heated to 1000C. Its length is increased by 0.19 cm. Coefficient of cubical expansion of the silver rod is : a. 5.7 x 10-5/0C b. 0.63 x 10-5/0C c. 1.9 x 10-5/0C d. 61.1 x 10-5/0C 44. 42 Problem Two charges are at a distance d apart. If a copper plate of thickness d/2 is kept between them, the effective force will be : a. F/2 b. Zero c. 2F d. 2F 45. 43 Problem Braggs law for X-rays is : a. n sin 2 d b. d sinn c. 2 d sin n 46. 44 Problem Two mirrors are placed at right angle to each other. A man is standing between them combing his hair. How many images will he see ? a. 2 b. 3 c. 1 d. zero 47. 45 Problem We can obtain polarized light with the help of which of the following instrument ? a. Nicol prism b. Biprism c. Polarimeter d. None of these 48. 46 Problem 15 g of ice melts to form water at 00C. What is the change in entropy ? a. 18.5 b. 15 c. zero d. None of these 49. 47 Problem A piece of copper and another of germanium are cooled from room temperature to 50 K. The resistance of : a. Each of them decreases b. Copper decreases and germanium increases c. Each of them increases d. Copper increases and germanium decreases 50. 48 Problem The threshold wavelength for photoelectrons emission from a material is 5200 . Photoelectrons will be emitted when this material is illuminated with monochromatic radiation from a : a. 1 W infrared lamp b. 1 W ultraviolet lamp c. 500 W infrared lamp d. 1000 W infrared lamp 51. 49 Problem A small magnet kept in a non-uniform magnetic field experiences : a. Neither a force nor a torque b. A force and a torque c. A torque but not a force d. A force but not a torque 52. 50 Problem In a room containing smoke particles, the intensity due to a source of light will : a. Obey the inverse square law b. Be constant at all distances c. Increase with distance from the source than the inverse fourth power law d. Fall faster with distance from source than the inverse fourth power law 53. 51 Problem When a ray of light enters a glass slab from air : a. Its wavelength increases b. Neither wavelength increases c. Its wavelength decreases d. Its frequency increases 54. 52 Problem Saturated vapour is compressed to half its volume without any change in temperature, then the pressure will be : a. Doubled b. Halved c. The same d. Zero 55. 53 Problem The superficial expansively of a solid is , then the cubical expansivity is : a. 2/3 b. 3/2 c. 2 d. 3 56. 54 Problem When a star approaches the earth, then the spectral lines are shifted towards : a. Red end b. Blue end c. Yellow colour d. Green colour 57. 55 Problem A particle is executing SHM at mid point of mean position and extremity. What is the potential energy in terms of total energy (E) ? a. E/4 b. E/16 c. E/2 d. E/8 58. 56 Problem In simple harmonic motion, the ratio of acceleration of the particle to its displacement at at any time is a measure of : a. Spring constant b. Angular frequency c. (angular frequency)2 d. restoring force 59. 57 Problem In case of steel wire or a metal wire, the elastic limit is reached when : a. The wire just break b. The load is more than the weight of wire c. Elongation is inversely proportional to the tension d. None of the above 60. 58 Problem A hole is drilled through the earth along the diameter and a stone is dropped into it. When the stone is at the centre of earth, it possesses : a. Weight b. Mass c. Acceleration d. Potential energy 61. 59 Problem An eraser weighing 1 N is pressed against a vertical black board with a normal force of 5 N. The coefficient of friction between eraser and black board is approximately 0.4. The force along the black board required to move the easer is : a. 2 N b. 0.4 N c. 2.4 N d. 9.8 N 62. 60 Problem A ball of mass 0.12 kg is being whirled is an horizontal circle at the end of string 0.5 m long. It is capable of making 231 revolutions in one minute. The breaking tension of the string is : a. 3 N b. 15.1 N c. 31. 5 N d. 35.1 N 63. 61 Problem It is possible to hear beats from the two vibrating sources of frequencies : a. 1000 Hz and 1500 Hz b. 400 Hz and 500 Hz c. 100 Hz and 150 Hz d. 20 Hz and 25 Hz 64. 62 Problem Force between two plates of a capacitor is : q2 a.2 0A2 b. q0 Aq c.0A d. none of these 65. 63 Problem A transistor can be used as an amplifier when : a. Emitter is forward biased and collector is reverse biased b. Both are reverse biased c. Both emitter and collector are forward biased d. None of the above 66. 64 Problem A wire of length l and resistance R is stretched to get the radius of cross-section r/2. Then the new value of R is : a. 16 R b. 4 R c. 8 R d. 5 R 67. 65 Problem Calcium plate has maximum possible radiation of wavelength of 400 nm to eject electrons. Its work function is : a. 2.3 eV b. 3.1 eV c. 4.5 eV d. none of these 68. 66 Problem If one face of prism is silvered having prism angle 300 and 2. What will be the angle of incidence, so that the incident ray retraces its path ? 300 600 900 450 69. 67 Problem Mass number of nucleus is : a. Always less than is atomic number b. Always more than its atomic number c. Sometimes more than atomic number exceptionally equal to its atomicnumber d. Always equal to its atomic number 70. 68 Problem A 1 F capacitor is charged to 50 V potential difference and then discharged through a 10 mH inductor of negligible resistance. The maximum current in the inductor will be : a. 0.5 A b. 1.6 A c. 0.16 A d. 1.0 A 71. 69 Problem A 100 W bulb working on 200 V has resistance R and a 200 W bulb working on 100 V has resistance S, then R/S is : a. 1/8 b. 1/4 c. 8 d. 4 72. 70 Problem Dimensions of capacitance is : a. [M-1L-2T4A2] b. [MLT-3A-1] c. [ML2T-3A-1] d. [M-1L-2T3A-1] 73. 71 Problem In a mechanical refrigerator, the low temperature coils are at a temperature of 230C and the compressed gas in the condenser has a temperature of 270C. The theoretical coefficient of performance is : a. 5 b. 8 c. 6 d. 5 74. 72 Problem The thermal capacity of a body is 80 cal, then its water equivalent is : a. 80 cal/g b. 80 g c. 800 g d. 80 kg 75. 73 Problem A brass disc fits simply in a hole of a steel plate. The disc from the hole can be loosened, if the system : a. First heated then cooled b. First cooled then heated c. Is heated d. Is cooled 76. 474 Problem Velocity of sound measured in hydrogen and oxygen gas at given temperature will be in the ratio : a. 1 : 1 b. 2 : 1 c. 1 : 4 d. 4 : 1 77. 475 Problem The amount of the work done in blowing a bubble of radius r and surface tension , is : a. b. 4 r 2 c. 8 r 2 d.6r2 78. 76 Problem A liquid X of density 3.36 g/cm3 is poured in a U-tube, which contains Hg. Another liquid Y is poured in left arm with height 8 cm, upper levels of X and Y are same. What is density of Y ? a. 0.8 g/cc b. 1.2 g/cc c. 1.4 g/cc d. 1.6 g/cc 79. 77 Problem For a given material, the Youngs modulus is 2.4 times that of rigidity modulus, then poissons ratio of : a. 0.2 b. 0.4 c. 1.2 d. 2.4 80. 78 Problem When a body is supposed to be falling under gravity, its acceleration depends upon mass of : a. Both the earth and the body b. The body but independent of mass of earth c. The earth d. The body 81. 79 Problem In BJT, maximum current flows in which of the following ? a. Emitter region b. Base region c. Collector region d. Equal in all regions 82. 80 Problem A ball thrown vertically upwards with an initial velocity 1.4 ms-1 returns in 2 s. The total displacement of the ball is : a. 22.4 m b. zero c. 44.8 m d. 33.6 m 83. 81 Problem In double slit experiment, the angular which of the fringes is 0.200 for the sodium light ( 5890). In order to increase the angular width of the fringes= by 10%, the necessary change in wavelength is : a. Zero b. Increased by 6479 c. Decreased by 586 d. Increased by 589 84. 82 Problem A convex lens has mean focal length of 20 cm. The dispersive power of the material of the lens is 0.02. The longitudinal chromatic aberration for an object at infinity is : a. 103 b. 0.80 c. 0.40 d. 0.20 85. 83 Problem 1mg gold undergoes decay with 2.7 days half-life period, amount left after 8.1 days is : a. 0.125 mg b. 0.5 mg c. 0.25 mg d. 0.91 mg 86. 84 Problem A planet have same density and same acceleration due to gravity as of earth and universal gravitational constant G is twice of earth, the ratio of their radii is : a. 1 : 4 b. 1 : 5 c. 1 : 2 d. 3 : 2 87. 85 Problem If refractive index of glass is 1.50 and of water is 1.33, then critical angle is :8 a. sin 192 b. sin 131 8 c. cos9 d. None of these 88. 86 Problem If an object subtends an angle of 20 at eye when seen through telescope having objective and eye-piece of focal length f0 = 60 cm and fe = 5 cm respectively, then angle subtend at eye-piece is : a. 100 b. 240 c. 500 d. 100 89. 87 Problem The ionization potential of mercury is 10.39 V. How far an electron must travel in an electric field of 1.5 x 106 V/m to gain sufficient energy to ionize mercury ? a. 10.39m1.6 x 10 1910.39 b. m2 x 1.6 x 10 19 c. 10.39 x 1.6 x 10-19 m 10.39 d. m1.5 x 106 90. 88 Problem A straight wire conductor of length l of 0.4 m is moving with a speed v of 7 m/s perpendicular to a magnetic field B of intensity 0.9 Wb/m2. The induced emf across the conductor is : a. 2.52 V b. 25.2 V c. 5.26 V d. 1.26 V 91. 89 Problem It takes 12 min to boil 1 L of water in an electric kettle. Due to some defect it becomes necessary to remove 20% turns of the heating coil of the kettle. After repair, how must time will it take to boil 1 L of water ? a. 9.6 min b. 14.4 min c. 16.8 min d. 18.2 min 92. 90 Problem Electromagnetic radiation consists of photons which have the greatest energy is : a. radio waves b. -rays c. visible light d. X-ray 93. 91 Problem Sound waves from whistle of frequency 1100 Hz reaches a point by two different paths. When the paths differ by 0.15 m and 0.45 m, there is a silence at that point. The speed of sound is : a. 1100 x 0.60 m/s b. 1100 x 0.45 m/s c. 1100 x 0.30 m/s d. 1100 x 0.15 m/s 94. 92 Problem The ratio of radiant energies radiated per unit surface area by two bodies is 16 : 1, the temperature of hotter body is 1000 K, then the temperature of colder body will be : a. 250 K b. 500 K c. 1000 K d. 62.5 K 95. 93 Problem A cylindrical tube closed at one end contains air. It produces the fundamental note of frequency 512 Hz. If the tube is opened at both ends. The fundamental frequency that can be excited is : a. 256 Hz b. 512 Hz c. 1024 Hz d. 128 Hz 96. 94 Problem What is the ratio of most probable speed and average speed in a gas enclosed in a vessel ?2 a. b.2 c. 1 d.4 97. 95 Problem A block of steel of size 5 cm x 5 cm x 5 cm is weighed in water. If the relative density of steel is 7, its apparent weight is : a. 4 x 4 x 4 x 6 g b. 5 x 5 x 5 x 9 g c. 4 x 4 x 4 x 7 g d. 6 x 5 x 5 x 5 g 98. 96 Problem A coin is of mass 4.8 kg and radius 1 m rolling on a horizontal surface without sliding with angular velocity 600 rot/min. What is total kinetic energy of the coin ? a. 360 J b. 1440 2 J c. 4000 2 J d. 600 2 J 99. 97 Problem 1 N/m is equal to : a. 1 Jm-2 b. 1 Jm-3 c. 1 Jm2 d. none of these 100. 98 Problem A force F1 of 500 N is required to push a car of mass 1000 kg slowly at constant speed on a leveled road. If a force F2 of 1000 N is applied, the acceleration of the car will be : a. Zero b. 1.5 m/s2 c. 1.0 m/s2 d. 0.5 m/s2 101. 99 Problem A particle of mass 0.2 kg tied at the end of a spring is being rotated along a vertical circle of radius 0.5 m at critical speed of 5 m/s. The tension T in the string at the highest point of its path is : a. 8.04 N b. 11.96 N c. 10 N d. 1.96 N 102. 100 ProblemThe current gain in the common-emitter mode of a transistor is 10. The inputimpedance is 20 k and load of resistance is 100 k. The power gain is :a. 300b. 500c. 200d. 100 103. FOR SOLUTIONS VISIT WWW.VASISTA.NET