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# AFMC Physics 2002

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### AFMC Physics 2002

1. 1. AFMC–Past papers<br />PHYSICS- UNSOLVED PAPER - 2002<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 />To convert a galvanometer in a voltmeter, we must connect a<br />Low resistance in series<br />High resistance in parallel<br />Low resistance in parallel<br />High resistance in series<br />
4. 4. Problem<br />02<br />A galvanometer of 100 Ω resistance gives full scale deflection with 0.01 A current. How much resistance should be connected to convert it into an ammeter of range 10 A?<br />0.2 Ω in series <br />0.1 Ω in parallel<br />0.1 Ω in series<br />0.2 Ω in parallel<br />
5. 5. Problem<br />03<br />The potential difference between two electrodes of a galvanic cell, in an open circuit, is known as<br />Current<br />Electromotive force<br />Potential difference<br />Impedance<br />
6. 6. Problem<br />04<br />The magnetic field B0 due to a current carrying circular loop of radius 12 cm at its centre is 0.50 x 10-4 T. The magnetic field due to this loop at a point on the axis at a distance of 5 cm from the centre is<br />3.5 * 10-9 T <br />3.9 * 10-5 T<br />9.3 * 10-5 T <br />5.3 * 10-9 T<br />
7. 7. Problem<br />05<br />An e.m.f. of 15 volt is applied in a circuit containing 5 H inductance and 10 Q resistance. The ratio of currents at t = °o and at t = 1 sec is<br />a. e-1<br />b. <br />c. <br />d. 1-e<br />
8. 8. Problem<br />06<br />Aledo is<br />Reflecting power of a heavenly body<br />Transitive power of a heavenly body<br />Absorptive power of a heavenly body<br />Refracting power of a heavenly body<br />
9. 9. Problem<br />07<br />Who disproved the geocentric theory of universe?<br />Aristotle <br />Charles Darwin<br />Issac Newton <br />Copernicus<br />
10. 10. Problem<br />08<br />In a p-n-p transistor working as a common-base amplifier, current gain is 0.96 and emitter current is 7.2 mA. The base current is<br />0.4 mA<br />0.2 mA<br />0.29 mA<br />0.35 mA<br />
11. 11. Problem<br />09<br />In a nuclear reactor, the fast moving neutrons are slowered down by passing them through<br />Oil <br />Kerosene<br />Heavy water <br />Vacuum<br />
12. 12. Problem<br />10<br />A sample of a radioactive substance contains 2828 atoms. If its half-life is 2 days, how many atoms will be left intact in the sample after one day?<br />1414 <br />1000<br />2000 <br />707<br />
13. 13. Problem<br />11<br />Magnetic field is measured in<br />Weber <br />Weber/(metre)2<br />Weber-(meter)2<br />Henry<br />
14. 14. Problem<br />12<br />The dimensions of Planck's constant are<br />[ML2T-1]<br />[M0L-1T-3]<br />[ML-2T-1] <br />[ML3T-1]<br />
15. 15. Problem<br />13<br />The speed of boat is 5 km/hr in still water. It crosses a river of width 1 km along the shortest possible path in 15 minutes. Then velocity of river is<br />4 km/hr <br />1 km/hr<br />2 km/hr <br />3 km/hr.<br />
16. 16. Problem<br />14<br />A bullet is dropped from the same height when another bullet is fired horizontally. They will hit the ground<br />Simultaneously<br />Depends upon mass of bullet<br />Depends on the observer<br />One after the other<br />
17. 17. Problem<br />15<br />The displacement of a particle moving in a straight line depends on time (/) as : x = αt3 + βt2 + γt + δ The ratio of its initial acceleration to its initial velocity depends<br />Only on α<br />Only on α and y<br />Only on β and y<br />Only on α and β<br />
18. 18. Problem<br />16<br />A paper, with two marks having separation d, is held normal the line of right of an observer at distance of 50 cm. The diameter of the eyeslens of the observer is 2mm. Which of the following is the least value of of so that the marks can be seen as separate? (mean wavelength of visible light may be taken 5000A)<br />0.125 cm <br />2.125 cm<br />1.525 cm <br />1.225 cm<br />
19. 19. Problem<br />17<br />At what angle, a ray of light will be incident on one face of an equilateral prism, so that the emergent ray may graze the second surface of the prism (µ = 1.5)<br />18° <br />38°<br />32°<br />28°<br />
20. 20. Problem<br />18<br />Which of the following waves have the maximum wavelength?<br />X-rays <br />IR rays<br />UV rays<br />Radio waves<br />
21. 21. Problem<br />19<br />Two magnets of magentic moments M and 2M are placed in a vibration magnetometer, with identical poles in the same direction. The time period of vibration of the combination is T1. If the same magnets are placed with opposite poles together and vibrate with time period T2 then<br />T2 = Tl<br />T2 is infinite<br />T2 < T1<br />T2 > T1<br />
22. 22. Problem<br />20<br />Curie temperature of iron is the temperature below which it is<br />Radioactive<br />Superconducting<br />Ferromagnetic<br />Diamagnetic<br />
23. 23. Problem<br />21<br />If a cyclist moving with a speed of 4.9 m/s on a level road can take a sharp circular turn of radius 4 m, then coefficient of friction between the cycle tires and road is<br />0.41<br />0.51<br />0.61<br />0.71<br />
24. 24. Problem<br />22<br />A body of mass 5 kg is moving in a circle of radius 1 m with an angular velocity of 2 rad/sec. The centripetal force acting on the body is<br />10N <br />40 N<br />30 N<br />20 N<br />
25. 25. Problem<br />23<br />A bullet of mass 25 g moving with a velocity of 200 m/s is stopped within 5 cm of the target. The average resistance offered by the target is<br />10 Kn<br />40 kN<br />30 kN<br />20 kN<br />
26. 26. Problem<br />24<br />Two masses mA and mB moving with velocities vA and vB in opposite directions collide elastically. After that the masses mA and mB move with velocity vB and vA respectively. The ratio is <br />a.1<br />b.<br />c.<br />d.<br />
27. 27. Problem<br />25<br />A machine delivering constant power moves a body along a straight line. The distance moved by the body in time t is proportional to<br />t<br />t3/4<br />t3/2<br />√t<br />
28. 28. Problem<br />26<br />A 100 W, 200 V bulb is connected to a 160 volts supply. The actual power consumption would be<br />64 W <br />125 W<br />100 W <br />80 W<br />
29. 29. Problem<br />27<br />In the given figure, the capacitors C,, C3, C4, C, have a capacitance of 4 each. If the capacitor C2 has a capacitance of 10 |.iF, then effective capacitance between A and B is<br />2 µF<br />4 µF<br />6 µF<br />8 µF<br />
30. 30. Problem<br />28<br />The energy stored in a capacitor is actually stored<br />Between the plates<br />On the outer surface of the plates<br />On the negative plate<br />On the positive plate<br />
31. 31. Problem<br />29<br />Two identical mercury drops, each of radius r are charged to the same potential V. If the mercury drops coalesce to form a big drop of radius R, then potential of the combined drop will be<br />(2)3/2 V <br />(3)1/2 V<br />(3)2/3 V <br />(2)2/3 V<br />
32. 32. Problem<br />30<br />When a current flows in a wire, there exists an electric field in the direction of<br />Flow of current<br />At an angle of 45° to the flow of current<br />Perpendicular to the flow of current<br />Opposite to the flow of current<br />
33. 33. Problem<br />31<br />f the radius of earth is reduced by 1% without changing the mass, then change in the acceleration due to gravity will be <br />1% decrease <br />2% decrease<br />2% increase <br />1% increase<br />
34. 34. Problem<br />32<br />If the spinning speed of earth is increased, then weight of the body at the equator <br />Increase <br />Does not change<br />Doubles <br />Decreases<br />
35. 35. Problem<br />33<br />The ratio of energy required to raise a satellite to a height h above the earth's surface to heat required to put it into the orbit is<br />h : R <br />h : 2R<br />2h : R<br />R : h<br />
36. 36. Problem<br />34<br />The moment of inertia, of a rigid body, depends upon<br />Mass of the body<br />Distribution of mass from axis of rotation<br />Angular velocity of the body<br />Angular acceleration of the body<br />
37. 37. Problem<br />35<br />A circular disc is rotating with angular velocity co. If a man standing at the edge of the disc walks towards its centre, then the angular velocity of the disc will<br />Decrease<br />Not change<br />Be halved <br />Increase<br />
38. 38. Problem<br />36<br />First law of thermodynamics deals with the conservation of<br />Energy <br />Momentum<br />Charge <br />Mass<br />
39. 39. Problem<br />37<br />For a gas, if the ratio of specific heats at constant pressure and volume is y, then the value of degree of freedom is<br />a.<br />b.<br />c.<br />d.<br />
40. 40. Problem<br />38<br />Work done by a simple pendulum in one complete oscillations is<br />a. Zero<br />b.<br />c.<br />d.<br />
41. 41. Problem<br />39<br />A lift is ascending with an acceleration equal to g/3. What will be the time-period of a simple pendulum suspended from its ceiling if its time-period in stationary lift is T.<br />a.<br />b.<br />c.<br />d.<br />
42. 42. Problem<br />40<br />If the equation of a sound wave is given as : Y = 0.0015 sin(62.4 a- + 316 t), then wavelength of this wave is<br />0.4 unit <br />0.1 unit<br />0.2 unit<br />0.3 unit<br />
43. 43. Problem<br />41<br />Which of the following property of light waves is not observed in sound waves?<br />Reflection <br />Doppler effect<br />Polarization<br />Refraction<br />
44. 44. Problem<br />42<br />In a sinusoidal wave, the time required for a particular point to move from maximum displacement is 0.17 sec. The frequency of the wave is<br />0.36 Hz <br />2.94 Hz<br />1.47 Hz<br />0.73 Hz<br />
45. 45. Problem<br />43<br />The amplitude of the vibrating particle due to superposition of two simple harmonic motions of is and Y2=sin( t) is<br />1<br />2<br />S<br /> 42<br />
46. 46. Problem<br />44<br />A standing wave is r e p r e s e n t e d by : y = asin(100 t).cos(0.01x); where t in seconds and x in metres. The velocity of wave is<br />104 m/s<br />10-2 m/s<br />10-4 m/s <br />1 m/s<br />
47. 47. Problem<br />45<br />A simple pendulum of length I has a maximum angular displacement 9. The maximum kinetic energy of the bob of mass m is<br />Mgl<br />mgl (I - cosθ)<br />mglsinθ<br />0.5 mgl<br />
48. 48. Problem<br />46<br />How many images will be formed if two mirrors are fitted on adjacent wall and one mirror on r o o f ?<br />2<br />5<br />7 <br />10<br />
49. 49. Problem<br />47<br />An optician prescribes spectacles to a patient with a combination of a convex lens of focal length 40 cm and concave lens 25 cm. The power of spectacles is<br />-1.5 D<br />6.5 D<br />1.5 D<br />-6.5 D<br />
50. 50. Problem<br />48<br />The velocity of an electron in the inner-most orbit of an atom is<br />Zero<br />Highest<br />Lowest<br />Mean<br />
51. 51. Problem<br />49<br />The hydrogen atom can give spectral lines in the Lyman, Balmer and Paschen series. Which of the following statement is correct?<br />Paschen series is in visible region<br />Balmer series is in ultra violet-region<br />Lyman series is in infra-red region<br />Balmer series is in visible region<br />
52. 52. Problem<br />50<br />Which of the following pairs has same dimensions?<br />Stress and strain<br />Pressure and density<br />Momentum and inertia<br />Impulse and momentum<br />
53. 53. For solution visit www.vasista.net<br />