AFMC Physics 1998

AFMC–Past papers PHYSICS- UNSOLVED PAPER - 1998

SECTION – A Single Correct Answer Type There are five parts in this question. Four choices are given for each part and one of them is correct. Indicate you choice of the correct answer for each part in your answer-book by writing the letter (a), (b), (c) or (d) whichever is appropriate

Problem 01 Two lenses whose powers are +2D and -4D respectively. The power of combination -4 D +2 D -2 D +4 D

Problem 02 The energy produced in the sun is due to Chemical reaction Fusion reaction Fission reaction Motion of electrons and ions

Problem 03 In a transformer, the number of turns of primary coil and secondary coil are 5 and 4 respectively. If 240 V is applied on the primary coil, then the ratio of current in primary and secondary coil is 5 : 9 5:4 4 : 5 9 : 5

Problem 04 Thermocouple thermometer is based on Peltier effect Compton effect Seebeck effect Photoelectric effect

Problem 05 Two vessels of different materials are similar in size in every respect. The same quantity of ice filled in them gets melted in 20 minutes and 40 minutes respectively. The ratio of thermal conductivities of the metal is 3:1 6 : 5 5 : 6 2 : 1

Problem 06 The part of a transistor, which is heavily doped to produce a large number of majority carriers, is Collector Emitter Base None of these

Problem 07 When two surfaces are coated with a lubricant, then they Roll upon each other Slide upon each other Stick to each other None of these

Problem 08 We have a galvanometer of resistance 25 Q wire. It200 current that flows through the galvanometer is given a. b. c. d.

Problem 09 The kinetic energy of a particle executing S.H.M., is 16 J when it is in its mean position. If the amplitude of oscillations is 29 cm, and the mass of the particle is 5.12 kg, the time period of the oscillation is 20πsec 2 π sec π/5 π sec 5πsec

Problem 10 A body of mass 100 gm is rotating in a circular path of radius r with constant velocity. The work done in one complete revolution is a. b. c. 100 r j d. Zero

Problem 11 If the surface tension of water is 0.06 N m then the capillary rise in a tube of a diameter 1 mm is (0 = 0°) 3.12 cm 2.44 cm 1.68 cm 3.86 cm

Problem 12 Swimming is possible by the Third law of motion Second law of motion First law of motion Newton's law of gravitation

Problem 13 In y-decay Mass number (A) remains constant but atomic number (Z) will be changed Atomic number (Z) remains constant but mass number (A) will be changed Affected Not affected

Problem 14 One tesla is equal to 104 gauss 10-4 gauss 107 gauss 10-8 gauss

Problem 15 The given truth table is a OR gate AND gate NAND gate EXOR gate

Problem 16 In an A.C. circuit the potential difference across an inductance and resistance joined in series are respectively 16 V and 20 V. The total potential difference across the circuit 31.9 V 25.6 V 20.0 V 53.5 V

Problem 17 Force of attraction between the plates of a parallel plate capacitor is a. b. c. d.

Problem 18 The velocity of sound is greatest in Vacuum Air Water metal

Problem 19 A force of 50 dynes is acted on a body of mass 5 gm which is at rest for an interval of 3 sec, then impulse is 1.5x 10-3 N-s 0.98 x 10-3 N-s 0.16x 10-3 N-s 2.5 x 10-3 N-s

Problem 20 Which of the following does not change when light goes from one medium to another? Speed Wavelength Frequency Intensity

Problem 21 The Doppler's effect is applicable for Space waves Sound waves Light waves Both (b) and (c)

Problem 22 S.I. unit of magnetic flux is Weber per m Weber Weber-m-3 Weber per m4

Problem 23 If the displacement of a particle executing S.H.M. is given by y = 0.30 sin (220t + 0.64) in metre, then the frequency and maximum velocity of the particle is 58 Hz, 113 m/s 45 Hz, 93 m/s 35 Hz, 66 m/s 36 Hz, 133 m/s

Problem 24 The kinetic energy of a body of mass 2 kg and momentum of 2 N-s is 3 J 2 J 1 J 4 J

Problem 25 A ray of light is incident on the surface of separation of a medium with the velocity of light at an angle 45° and is refracted in the medium at an angle 30°. What will be the velocity of light in the medium? 3.18 x 108 m/s 2.12 x 108 m/s 1.96 x 108 m/s 3.33 x 108 m/s

Problem 26 If a body of mass 3 kg is dropped from the top of a tower of height 25 meters, then its kinetic energy after 3 seconds will be 746 J 1048 J 1296 J 557 J

Problem 27 If two balls, each of mass 0.06 kg, moving in opposite directions with speed of 4 m/s, collide and rebound with the same speed, then the impulse imparted to each ball due to other is 0.81 kg m/s 0.53 kg m/s 0.48 kg m/s 0.92 kg m/s

Problem 28 When the amount of work done is 333 cal and change in internal energy is 167 cal, then the heat supplied is 500 cal 300 cal 100 cal 700 cal

Problem 29 If an iron ball and a wooden ball of the same radius are released from a height 'h' in vacuum, then time taken by both of them to reach ground will be Roughly equal Exactly equal Unequal Zero

Problem 30 The E.M.F. of the Daniel cell is 2.56 V 1.12 V 0.56 V 3.12 V

Problem 31 The speed of a wave in a medium is 760 m/s. If 3600 waves are passing through a point in the medium in 2 minutes, then its wavelength is 41.5 m 25.3 m 13.8 m 57.2 m

Problem 32 If luminous-efficiency of a lamp is 2 lumen/watt and its luminous-intensity is 42 candela then, power of the lamp is 138W 76W 62W 264W

Problem 33 The specific heat of a gas in an isothermal process is Negative Zero Infinite Remains constant

Problem 34 A big drop of radius R is formed by 1000 small droplets of water, then the radius of small drop is a. R/6 b. R/5 c. R/2 d. R/10

Problem 35 The kinetic energy of one g-molecule of a gas at normal temperature and pressure is (R = 8.31 J/mole-K) 2.7 x 102 J 1.3 x 102 J 0.56 x 104 J 3.74 x 103 J

Problem 36 Which of the following is the relation of centripetal force? a.mv/r3 b. mv/r c. mv2/r d. mv2/r2

Problem 37 Which of the following is a scalar quantity? Acceleration Electric field Displacement Work

Problem 39 Dimension of impulse is [ML0T-2] [MLT-1] [ML-1T-2] [ML-1T-3]

Problem 40 A black body radiates heat energy at the rate of 2 x 105 sec/m2 at a temperature of 1270c. The temperature of the black body, at which the rate of heat radiation is 32 x 105 J/sec/m2 is 873°C 527°C 273°C 927°C

Problem 41 Which of the following series is found in the visible region? Pfund Paschen Lyman Balmer

Problem 42 When an electron is emitted from a nucleus, the effect on its neutron-proton ratio is Remains same Decreased Increased First (a) then (b)

Problem 43 The half-life of a radioactive is 3.6 days. How much of 20 miligram of that radioactive will remain after 40 days? 6.20x10-3mg 4.31x10-2mg 2.68x103 mg 9.7x10-3 mg

Problem 44 When a slow neutron goes sufficiently close to a U235 nucleus then the process takes place is Fusion of U235 Fusion of neutron Fission of U235 First (a) then (b)

Problem 45 The first operation involved in a carnot cycle is Isothermal compression Adiabatic expansion Isothermal expansion Adiabatic compression

Problem 46 A parallel plate capacitor is charged to 60 µC. Due to a radioactive source, the plate loses charge at the rate of 1.8 x 108 C/s. The magnitude of displacement current is 4.1 x 1011 C/s 3.6 x108 C/s 1.8 x 108 C/s 5.7 x 1012 C/s

Problem 47 A body is executing simple harmonic motion with an angular frequency 2 rad/sec. The velocity of the body at 20 mm displacement, when the amplitude of motion is 60 mm, is 118 mm/s 113mm/s 90 mm/s 131 mm/s

Problem 48 A tuning fork makes 256 vibrations per second in air. When the velocity of sound is 330 m/s, then wavelength of the tone emitted is 1.11 m 0.98 m 0.56 m 1.29 m

Problem 49 The mass of moon is 7.34 x 1022 kg. If the acceleration due to gravity on the moon is 1.4 m/s2, the radius of the moon is (G = 6.667 *1011N-m2/kg2) 1.92 x 106 m 1.86 x 106 m 0.56 x 104m 1.01 x 108 m

Problem 50 A car travels first half distance between two places with a speed of 30 km/hr and remaining half with a speed of 50 km/hr. The average speed of the car is 42 km/hr 10 km/hr 37.5 km/hr 40 km/hr

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AFMC Physics 1998

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