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# AFMC Physics 1996

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### AFMC Physics 1996

1. 1. AFMC–Past papers<br />PHYSICS- UNSOLVED PAPER - 1996<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 />A ball is dropped from 10m. it is embedded in sand by 15 mm and then stops, which of the following is conserved?<br />Temperature<br />Momentum <br />Kinetic energy<br />Both (a) and (c)<br />
4. 4. Problem<br />02<br />If we consider electrons and photons of the same wavelength, then they will have same<br />Momentum<br />Energy<br />Angular momentum<br />Velocity<br />
5. 5. Problem<br />03<br />Equation for the change of state was given by<br />Newton <br />Clausius<br />Clausius-clapeyron<br />Joules<br />
6. 6. Problem<br />04<br />If n small balls, each of mass m impinge elastically each second on a surface with a velocity u, then the force experienced by the surface in one second will be<br />0.5 mnu<br />1 mnu<br />2 mnu<br />4mnu<br />
7. 7. Problem<br />05<br />Velocity of light is maximum in<br />Glass<br />Diamond<br />Vacuum<br />water<br />
8. 8. Problem<br />06<br />The equation of sound wave is Y=0.0015 sin(62.4x+316t) the wavelength of this wave is <br />0.2 unit<br />0.1 unit<br />0.3 unit<br />0.4 unit<br />
9. 9. Problem<br />07<br />In an adiabatic expansion of a gas<br />Temperature is kept constant<br />Heat is gained or lost<br />Volume is kept constant<br />Heat is neither gained nor lost<br />
10. 10. Problem<br />08<br />The dew point and atmospheric temperature on a particular day is found to be 180 c and 250c. if saturation vapour pressure at 180c 250c be 15.5 mm and 25.7 mm of Hg, its relative humidity is<br />90%<br />30.0%<br />Not possible to calculate<br />60.3%<br />
11. 11. Problem<br />09<br />The surface tension of a liquid is 108 dyne/cm2. It is equivalent to<br />105 N/m<br />107 N/m<br />104 N/m<br />106 N/m<br />
12. 12. Problem<br />10<br />When the key K is pressed at time t = 0, then which of the following statement about the current I in the resistor AB of the given circuit is true?<br />I oscillates between 1 mA and 2mA<br />I = 1 mA at all t<br />At t=0, I=2mA and with time it goes to 1mA<br />I = 2mA and at all t<br />
13. 13. Problem<br />11<br />Davy’s safety lamp is based on<br />Convection<br />Radiation<br />Polarization<br />Conduction<br />
14. 14. Problem<br />12<br />R.M.S velocity of a particle is v at pressure P. If the pressure increases by two times, then R.M.S velocity will become<br />2 v<br />0.5 v<br />4 v<br />v<br />
15. 15. Problem<br />13<br />light waves are transverse, because they<br />are polarized<br />reflect <br />are not polarized<br />refract<br />
16. 16. Problem<br />14<br />In a hydrogen discharge tube, it is observed that through a given cross-section 3.13 x 1015 electrons are moving from right to left and 3.12*1015 protons are moving from left to right. What is the electric current in the discharge tube and what is its direction?<br />2 mA towards right<br />1 mA towards right<br />2 mA towards left<br />1 mA towards left<br />
17. 17. Problem<br />15<br />When current flows in a conductor, then the ratio of the intensity of electric field E at any point within the conductor and the current density at a point is called<br />Specific resistance<br />Resistance<br />Inductance<br />Conductance<br />
18. 18. Problem<br />16<br />A man is standing on a spring platform. Reading of spring balance is 60 kg wt. if man jumps outside from the platform, then reading of spring balance. <br />Decrease to zero<br />Increase<br />Remain same<br />First (b) then (a)<br />
19. 19. Problem<br />17<br />A thermo flask is polished well<br />To absorb all radiation from outside<br />To make attractive<br />To reflect all radiation from outside<br />For shining<br />
20. 20. Problem<br />18<br />What percent of original radioactive atoms is left after five half-lives?<br />5%<br />20%<br />3%<br />10%<br />
21. 21. Problem<br />19<br />If the coefficient of friction of a plane inclined at 300 is 0.4 then acceleration of a body sliding freely on it is (g = 9.8m/s2)<br />4.9 m/s2<br />9.8 m/s2<br />2.54 m/s2<br />1.51 m/s2<br />
22. 22. Problem<br />20<br />If current flowing in a conductor changes by 1%, then power will change by <br />10%<br />1%<br />100%<br />2%<br />
23. 23. Problem<br />21<br />Coefficient of performance of an ideal refrigerator working between temperatures T1 and T2 (T1>T2) is<br />a.<br />b.<br />c.<br />d.<br />
24. 24. Problem<br />22<br />If an electron jumps from 1st orbit to 3rd orbit, then<br />No gain of energy<br />Absorb energy<br />No loss of energy <br />Release energy<br />
25. 25. Problem<br />23<br />The unit of R in the general gas equation is<br />a.<br />b.<br />c.<br />d.<br />
26. 26. Problem<br />24<br />in a coil of self-inductance % henry, the rate of change of current is 2 ampere per second e.m.f induced in the coil is<br />10 V<br />-10 V<br />5 V<br />-5 V<br />
27. 27. Problem<br />25<br />Myopia is due to<br />Shortening of eye ball<br />Older age<br />Elongation of eye ball<br />Change in focal length<br />
28. 28. Problem<br />26<br />If the new velocity of a body is twice its previous velocity, then kinetic energy will become<br />4 times<br />2 times<br />6 times<br />0.5 times<br />
29. 29. Problem<br />27<br />The laplace correction was necessary to newton’s calculation of velocity of sound, because travel of sound in a medium is <br />Isobaric process<br />Isothermal process<br />Isochoric process<br />Adiabatic process<br />
30. 30. Problem<br />28<br />An electric lamp is connected to 220 V, 50Hz supply. The peak voltage is<br />311 V<br />210 V<br />320 V<br />211 V<br />
31. 31. Problem<br />29<br />The discoverer of loudness and intensity of sound is<br />Laplace<br />Newton<br />Edison<br />Bell<br />
32. 32. Problem<br />31<br />Which of the following is not a unit of time?<br />Micro-second<br />Hour<br />Light year<br />Niño-second<br />
33. 33. Problem<br />32<br />The time period of a simple pendulum in a satellite is<br />Zero <br />Unity <br />Same as an earth<br />Infinity<br />
34. 34. Problem<br />32<br />Which of the following is the smallest unit?<br />Fermi<br />Millimeter<br />Metre<br />Angstrom<br />
35. 35. Problem<br />33<br />The phenomenon of production of e.m.f in a current carrying metallic strip on applying a magnetic field along a direction perpendicular to the direction of flow of current is known as<br />Seeback effect<br />Hall effect<br />Peltier effect<br />Joule effect<br />
36. 36. Problem<br />34<br />Resonance is a special case of<br />Damped vibration<br />Forced vibration<br />Un-damed vibration<br />Natural vibration<br />
37. 37. Problem<br />35<br />If magnetic material, which moves from stronger to weaker parts of a magnetic field, then it is known as<br />Diamagnetic<br />Paramagnetic<br />Ferromagnetic<br />Anti-ferromagnetic<br />
38. 38. Problem<br />36<br />What is the magnitude of magnetic force per unit length of a wire carrying a current of 5 A and making an angle of 300 with direction of a uniform magnetic field of 0.1 T?<br />0.25 N-m<br />0.35 N-m<br />0.45 N-m<br />0.55 N-m<br />
39. 39. Problem<br />37<br />Lightning was discovered by<br />Ohm<br />Faraday<br />Thomson<br />Franklin<br />
40. 40. Problem<br />38<br />A string attached with a bob of mass m oscillates from A to C and back to A such that PB is H. if the acceleration due to gravity is g, then the velocity of the bob as it passes through B is<br />mgH<br />Zero<br />√2gH<br />2gH<br />
41. 41. Problem<br />39<br />Thermal conductivity depends on<br />Difference in temperature<br />Nature of material<br />Atmospheric temperature<br />Heat produced<br />
42. 42. Problem<br />40<br />Half-life of radioactive material depends on<br />Material’s amount <br />Temperature<br />Disintegration medium<br />Nature of material<br />
43. 43. Problem<br />41<br />The evaporation of a liquid from its surface is based on<br />Thomson’s law <br />Joule’s law<br />Bernoulli’s law<br />Stefan’s law<br />
44. 44. Problem<br />42<br />In an equilateral triangular prism, the angle of minimum deviation for a certain wavelength is 400. The corresponding angle of incidence is<br />300<br />400<br />450<br />500<br />
45. 45. Problem<br />43<br />If vector A and B has angle Ѳ between them, then vector product is<br />AB<br />AB cosѲ<br />A x B xcos Ѳ<br />AB sin Ѳ<br />
46. 46. Problem<br />44<br />Which of the following cannot be resultant of 5 and 10?<br />5<br />8<br />2<br />7<br />
47. 47. Problem<br />45<br />What is the mass of a silver atom? (Avogadro’s no.=6.022*1023 mol-1 and atomic mass of silver = 108)<br />120.12 x 10-31 kg<br />17.93 x -26 kg<br />17.93 x 10-33 kg<br />16.81 x 10-29 kg<br />
48. 48. Problem<br />46<br />92U235 and 92U238 differ as<br />92U238 has 3 neutrons more<br />92U235 has 2 protons less<br />92U235 has 3 protons less<br />None of these<br />
49. 49. Problem<br />47<br />A rocket is based on ht principle of<br />Conservation of linear momentum<br />Conservation of angular momentum<br />Both (a) and ( b) <br />None of these<br />
50. 50. Problem<br />48<br />The radius of gyration of a disc of mass 50g and radius 2.5 cm about an axis passing through its centre of gravity and perpendicular to the plane is<br />0.52 cm<br />1.76 cm<br />3.54 cm<br />6.54 cm<br />
51. 51. Problem<br />49<br />The minimum number of non-collinear vectors required to produce a zero vector is <br />2<br />1<br />4<br />3<br />
52. 52. Problem<br />50<br />The dimension of angular velocity is<br />[M0L0T-1]<br />[M0LT-2]<br />[ML1T-1]<br />[M0LT-1]<br />
53. 53. For solution visit www.vasista.net<br />