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# AFMC Physics 1998

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• ### AFMC Physics 1998

1. 1. AFMC–Past papers<br />PHYSICS- UNSOLVED PAPER - 1998<br />
2. 2. SECTION – A<br />Single Correct Answer Type<br />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<br />
3. 3. Problem<br />01<br />Two lenses whose powers are +2D and -4D respectively. The power of combination<br />-4 D<br />+2 D<br />-2 D<br />+4 D<br />
4. 4. Problem<br />02<br />The energy produced in the sun is due to<br />Chemical reaction<br />Fusion reaction<br />Fission reaction<br />Motion of electrons and ions<br />
5. 5. Problem<br />03<br />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<br />5 : 9<br />5:4<br />4 : 5<br />9 : 5<br />
6. 6. Problem<br />04<br />Thermocouple thermometer is based on<br />Peltier effect<br />Compton effect<br />Seebeck effect<br />Photoelectric effect<br />
7. 7. Problem<br />05<br />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<br />3:1<br />6 : 5<br />5 : 6<br />2 : 1<br />
8. 8. Problem<br />06<br />The part of a transistor, which is heavily doped to produce a large number of majority carriers, is<br />Collector<br />Emitter<br />Base<br />None of these<br />
9. 9. Problem<br />07<br />When two surfaces are coated with a lubricant, then they<br />Roll upon each other<br />Slide upon each other<br />Stick to each other<br />None of these<br />
10. 10. Problem<br />08<br />We have a galvanometer of resistance 25 Q wire. It200 current that flows through the galvanometer is given<br />a.<br />b.<br />c.<br />d.<br />
11. 11. Problem<br />09<br />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<br />20πsec<br />2 π sec<br />π/5 π sec<br />5πsec<br />
12. 12. Problem<br />10<br />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<br />a.<br />b.<br />c. 100 r j<br />d. Zero<br />
13. 13. Problem<br />11<br />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°)<br />3.12 cm<br />2.44 cm<br />1.68 cm<br />3.86 cm<br />
14. 14. Problem<br />12<br />Swimming is possible by the<br />Third law of motion<br />Second law of motion<br />First law of motion<br />Newton's law of gravitation <br />
15. 15. Problem<br />13<br />In y-decay<br />Mass number (A) remains constant but atomic number (Z) will be changed<br />Atomic number (Z) remains constant but mass number (A) will be changed<br />Affected<br />Not affected<br />
16. 16. Problem<br />14<br />One tesla is equal to<br />104 gauss<br />10-4 gauss<br />107 gauss<br />10-8 gauss<br />
17. 17. Problem<br />15<br />The given truth table is a <br />OR gate<br />AND gate<br />NAND gate<br />EXOR gate<br />
18. 18. Problem<br />16<br />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<br />31.9 V<br />25.6 V<br />20.0 V<br />53.5 V<br />
19. 19. Problem<br />17<br />Force of attraction between the plates of a parallel plate capacitor is<br />a.<br />b.<br />c.<br />d.<br />
20. 20. Problem<br />18<br />The velocity of sound is greatest in<br />Vacuum<br />Air<br />Water<br />metal<br />
21. 21. Problem<br />19<br />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<br />1.5x 10-3 N-s<br />0.98 x 10-3 N-s<br />0.16x 10-3 N-s<br />2.5 x 10-3 N-s<br />
22. 22. Problem<br />20<br />Which of the following does not change when light goes from one medium to another?<br />Speed<br />Wavelength<br /> Frequency<br />Intensity<br />
23. 23. Problem<br />21<br />The Doppler's effect is applicable for<br />Space waves<br />Sound waves<br />Light waves<br />Both (b) and (c)<br />
24. 24. Problem<br />22<br />S.I. unit of magnetic flux is<br />Weber per m<br />Weber<br />Weber-m-3<br />Weber per m4<br />
25. 25. Problem<br />23<br />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<br />58 Hz, 113 m/s <br />45 Hz, 93 m/s <br />35 Hz, 66 m/s <br />36 Hz, 133 m/s<br />
26. 26. Problem<br />24<br />The kinetic energy of a body of mass 2 kg and momentum of 2 N-s is<br />3 J<br />2 J<br />1 J<br />4 J<br />
27. 27. Problem<br />25<br />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?<br />3.18 x 108 m/s<br />2.12 x 108 m/s<br />1.96 x 108 m/s<br />3.33 x 108 m/s<br />
28. 28. Problem<br />26<br />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<br />746 J<br />1048 J<br />1296 J<br />557 J<br />
29. 29. Problem<br />27<br />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<br />0.81 kg m/s<br />0.53 kg m/s<br />0.48 kg m/s<br />0.92 kg m/s<br />
30. 30. Problem<br />28<br />When the amount of work done is 333 cal and change in internal energy is 167 cal, then the heat supplied is<br />500 cal<br />300 cal<br />100 cal<br />700 cal<br />
31. 31. Problem<br />29<br />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<br />Roughly equal<br />Exactly equal<br />Unequal<br />Zero<br />
32. 32. Problem<br />30<br />The E.M.F. of the Daniel cell is<br />2.56 V<br />1.12 V<br />0.56 V<br />3.12 V<br />
33. 33. Problem<br />31<br />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<br />41.5 m<br />25.3 m<br />13.8 m <br />57.2 m<br />
34. 34. Problem<br />32<br />If luminous-efficiency of a lamp is 2 lumen/watt and its luminous-intensity is 42 candela then, power of the lamp is<br />138W<br />76W<br />62W<br />264W<br />
35. 35. Problem<br />33<br />The specific heat of a gas in an isothermal process is<br />Negative<br />Zero<br />Infinite<br />Remains constant<br />
36. 36. Problem<br />34<br />A big drop of radius R is formed by 1000 small droplets of water, then the radius of small drop is<br />a. R/6<br />b. R/5<br />c. R/2<br />d. R/10<br />
37. 37. Problem<br />35<br />The kinetic energy of one g-molecule of a gas at normal temperature and pressure is (R = 8.31 J/mole-K)<br />2.7 x 102 J<br />1.3 x 102 J<br />0.56 x 104 J<br />3.74 x 103 J<br />
38. 38. Problem<br />36<br />Which of the following is the relation of centripetal force?<br />a.mv/r3<br />b. mv/r<br />c. mv2/r<br />d. mv2/r2<br />
39. 39. Problem<br />37<br />Which of the following is a scalar quantity?<br /> <br />Acceleration<br />Electric field<br />Displacement<br />Work <br />
40. 40. Problem<br />39<br />Dimension of impulse is<br />[ML0T-2]<br />[MLT-1]<br />[ML-1T-2]<br />[ML-1T-3]<br />
41. 41. Problem<br />40<br />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<br />873°C<br />527°C<br />273°C<br />927°C<br />
42. 42. Problem<br />41<br />Which of the following series is found in the visible region?<br />Pfund<br />Paschen<br />Lyman<br />Balmer<br />
43. 43. Problem<br />42<br />When an electron is emitted from a nucleus, the effect on its neutron-proton ratio is<br />Remains same<br />Decreased<br />Increased<br />First (a) then (b)<br />
44. 44. Problem<br />43<br />The half-life of a radioactive is 3.6 days. How much of 20 miligram of that radioactive will remain after 40 days?<br />6.20x10-3mg<br />4.31x10-2mg<br />2.68x103 mg<br />9.7x10-3 mg<br />
45. 45. Problem<br />44<br />When a slow neutron goes sufficiently close to a U235 nucleus then the process takes place is<br />Fusion of U235<br />Fusion of neutron<br />Fission of U235<br />First (a) then (b)<br />
46. 46. Problem<br />45<br />The first operation involved in a carnot cycle is<br />Isothermal compression<br />Adiabatic expansion<br />Isothermal expansion<br />Adiabatic compression<br />
47. 47. Problem<br />46<br />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<br />4.1 x 1011 C/s <br />3.6 x108 C/s <br />1.8 x 108 C/s<br />5.7 x 1012 C/s<br />
48. 48. Problem<br />47<br />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<br />118 mm/s<br />113mm/s<br />90 mm/s<br />131 mm/s<br />
49. 49. Problem<br />48<br />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<br />1.11 m<br />0.98 m<br />0.56 m<br />1.29 m<br />
50. 50. Problem<br />49<br />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)<br />1.92 x 106 m<br />1.86 x 106 m<br />0.56 x 104m <br />1.01 x 108 m<br />
51. 51. Problem<br />50<br />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<br />42 km/hr<br />10 km/hr<br />37.5 km/hr<br />40 km/hr<br />
52. 52. For solution visit www.vasista.net<br />