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# AFMC Physics 2007

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• ### AFMC Physics 2007

1. 1. AFMC–Past papers<br />PHYSICS- UNSOLVED PAPER - 2007<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 forces of magnitude 8N and 15N respectively act at a point so as to make the resultant force 17 N. The angle between the forces is<br />120° <br />90°<br />45°<br />25°<br />
4. 4. Problem<br />02<br />A particle is projected making an angle 45° with the horizontal having kinetic energy K. The kinetic energy at highest point will be<br />K/y/2 <br />KJ2<br />2K <br />K<br />
5. 5. Problem<br />03<br />A cricket ball of mass 250 g collides with a bat with velocity lOm/s and returns with same velocity within 0.01 sec. The force acted on bat is<br />25 N <br />50 N<br />250 N <br />500 N<br />
6. 6. Problem<br />04<br />A jet engine works on the principle of<br />conservation of linear momentum<br />conservation of mass<br />conservation of energy<br />conservation of angular momentum<br />
7. 7. Problem<br />05<br />The maximum speed of a vehicle, so that it should not skid over curved path, is<br />a.<br />b.<br />c.<br />d.<br />
8. 8. Problem<br />06<br />A car is racing on a circular track of 180 m radius with a speed of 32 ms-1. What should be the banking angle of the road to avoid changes of skidding of the vehicle at this speed without taking into consideration the friction between the tyre and the road ?<br />45° <br />60°<br />30°<br />15°<br />
9. 9. Problem<br />07<br />A disc of moment of inertia kg m2 is rotating at 600 rpm. If the frequency of rotation changes from 600 rpm to 300 rpm then what is the work done ?<br />1470 J <br />1452 J<br />1567 J<br />1632 J<br />
10. 10. Problem<br />08<br />An adiabatic process occurs at constant<br />temperature <br />pressure<br />heat<br />temperature and pressure<br />
11. 11. Problem<br />09<br />If a Carnot engine is working with source temperature at 227°C and sink temperature at 27°C, its efficiency will be <br />40% <br />10%<br />67% <br />50%<br />
12. 12. Problem<br />10<br />Efficiency of a Carnot engine is 50% when temperature of sink is 500 K. In order to increase efficiency up to 60% keeping temperature of source remains the same, temperature of sink is<br />200 K <br />400 K<br />600 K <br />800 K<br />
13. 13. Problem<br />11<br />If the ratio of amplitude of two superposed waves is 2 : 1, then the ratio of maximum intensity and minimum intensity is<br />9:1<br />1 : 9<br />4 : 1<br />1 : 4<br />
14. 14. Problem<br />12<br />The focal length of the lens in a photographic camera is 2 m. What is the power of the lens ?<br />+2 D <br />+50 D<br />+5 D <br />+0.5 D<br />
15. 15. Problem<br />13<br />A parallel plate air capacitor is connected to battery. After charging fully, the battery is disconnected and the plates are pulled further apart. The strength of the electric field inside the capacitor would<br />remain unchanged<br />increase<br />decrease <br />oscillate<br />
16. 16. Problem<br />14<br />A bulb of 100W, 220V is operated on a line of 110V, then what will be the power consumed ?<br />25 W <br />75 W<br />50 W <br />90W<br />
17. 17. Problem<br />15<br />An electric kettle has two heating elements. One brings it to boil ten minutes and the other in fifteen minutes. If two heating filaments are connected in parallel, the water in kettle will boil in<br />6 minutes <br />8 minutes<br />25 minutes<br />5 minutes<br />
18. 18. Problem<br />16<br />In the series resonance the value of impedance is 3 Ω and the resistance is 4 Ω, then the value of power factor of the circuit is<br />4/3 <br />3/4<br />zero <br />infinity<br />
19. 19. Problem<br />17<br />"On flowing current in a conducting wire the magnetic field is produced around it." It is a law of<br />Lenz <br />Ampere<br />Ohm <br />Maxwell<br />
20. 20. Problem<br />18<br />A radioactive substance has a half-life of four months. Three fourth of the substance will decay will in<br />12 months <br />8 months<br />4 months <br />3 months<br />
21. 21. Problem<br />19<br />In a n-p-n transistor circuit the collector current is 9 mA. If 90% of the electrons emitted reach the collector, then the emitter current is<br />7 mA<br />8 mA<br />9 mA<br />10 mA<br />
22. 22. Problem<br />20<br />Mass defect is known as<br />ionization energy <br />binding energy<br />packing fraction <br />activity<br />
23. 23. Problem<br />21<br />I f the distance between the plates of two capacitors is increased then capacitance<br />increase <br />decrease<br />remains constant<br />first increase then decrease<br />
24. 24. Problem<br />22<br />Thermions are<br />+ vely charged<br />- v e l y charged<br />not charged<br /> none of these<br />
25. 25. Problem<br />23<br />Surface tension of water will be minimum at<br />0°C<br />25°C<br />60°C<br />75°C<br />
26. 26. Problem<br />24<br />The displacement of a particle moving along straight line depends on time (t) as x = αt3+βt3+ γt + δ The ratio of its initial acceleration to its in velocity depends only on<br />α<br />α and γ<br />β and γ<br />α and β<br />
27. 27. Problem<br />25<br />A wire suspended vertically from one of its ends is stretched by attaching a weight of 200 N the lower end. The weight stretches the wire by 1 mm. Then the elastic energy stored in the is<br />0.2 J<br />10 J<br />20 J <br />0.1 J<br />
28. 28. Problem<br />26<br />The length of second pendulum is 1 m on ear If mass and diameter of the planet is double than that of earth, then length becomes<br />lm <br />2m<br />0.5 m <br />4 m<br />
29. 29. Problem<br />27<br />Two masses m1 and m2 are suspended together by a massless spring of spring cosntant k. when the masses are in equilibrium, m1 is removed without disturbing the system, then the angular velocity of oscillation of m2 is<br />a.<br />b.<br />c.<br />d.<br />
30. 30. Problem<br />28<br />Weber/m2 is equal to<br />volt<br />henry<br />tesla<br />all of these<br />
31. 31. Problem<br />29<br />A body is executing simple harmonic motion an angular frequency 2 rad/s. The velocity of the body at 20 mm displacement, when the amplitude of motion is 60 mm, is<br />40 mm/s <br />50mm/s<br />113 mm/s <br />120 mm/s<br />
32. 32. Problem<br />30<br />A pipe open at both the ends produces a note of fundamental frequency f1. When the pipe is kept with ¾ th of its length in water, it produces a note of frequency f2. The ratio of f1/f2 is<br />4/3 <br />3/4<br />2 <br />1/2<br />
33. 33. Problem<br />31<br />The dimensions of . where ε0 is permittivity of free space and E is electric field are <br />ML-1T-2<br />ML2T-1<br />ML2T-1<br />ML2T-2<br />
34. 34. Problem<br />32<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 />unequal <br />exactly equal<br />roughly equal<br />zero<br />
35. 35. Problem<br />33<br />The maximum horizontal range of projectile is 400 m. The maximum height attained by it will be<br />100 m <br />200 m<br />400 m <br />800 m<br />
36. 36. Problem<br />34<br />The angular velocity of second's hand of a watch is<br />0.053 rad/s <br />0.210 rad/s<br />0.105 rad/s <br />0.42 rad/s<br />
37. 37. Problem<br />35<br />The density of ice is 0.9 g/c.c. and that of sea water is 1.1 g/c.c. An ice berg of volume V is floating in sea water. The fraction of ice berg above water level is<br />1/11 <br />2/11<br />3/11 <br />4/11<br />
38. 38. Problem<br />36<br />If length of a closed organ pipe is 1 m and velocity of sound is 330 m/s, then the frequency of first overtone is<br />a.<br />b.<br />c.<br />d.<br />
39. 39. Problem<br />37<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 />1.96 x 108 m/s<br />2.12 x 108 m/s<br />3.18 x 108m/s <br />3. 33 x 108m/s<br />
40. 40. Problem<br />38<br />Order of e/m ratio of proton p, a-particle and electron e is<br />e > p > α<br />p > α > e<br />e> α > p <br />none of these<br />
41. 41. Problem<br />39<br />The direction of magnetic line of force of a bar magnet is<br />from south to north pole<br />from north to south pole<br />across the bar magnet<br />from south to north pole inside the magnet and from north to south pole outside the magnet<br />
42. 42. Problem<br />40<br />The equation of a wave is represented by y = 10"4 sin where y in meter, x in metre and t is in seconds, then the velocity of wave will be<br />100 m/s <br />4 m/s<br />1000 m/s <br />10 m/s<br />
43. 43. Problem<br />41<br />A fan works on the principle of<br />electric dynamo <br />electric motor<br />transformer <br />none of these<br />
44. 44. Problem<br />42<br />To obtain a p-type semiconductor, germanium must be doped with<br />arsenic <br />antimony<br />indium <br />phosphorus<br />
45. 45. Problem<br />43<br />An a - p a r t i c l e and a proton are accelerated through same potential difference from rest. Find the ratio of their final velocity <br />4 : 1 <br />1 :1<br />1: √2<br />1 : 2<br />
46. 46. Problem<br />44<br />An electric lamp is connected to 220 V, 50 Hz supply. Then the peak voltage is<br />210 V <br />211V<br />311V <br />320 V<br />
47. 47. Problem<br />45<br />A hollow metal sphere of radius 10 cm is charged such that the potential on its surface is 80 V. The potential at the centre of the sphere is<br />zero <br />80 V<br />800 V <br />8 V<br />
48. 48. Problem<br />46<br />The masses of three wires of copper are in the ratio 1 : 3 : 5 and lengths are in the ratio 5 : 3 : 1 .Then the ratio of their electrical resistance are<br />1 : 3 : 5 <br />5 : 3 : 1<br />1 : 15: 25 <br />125:15:1<br />
49. 49. Problem<br />47<br />A charge +q is moving upwards vertically. It enters a magnetic field directed to the north. The force on the charged will be towards<br />north <br />south<br />west<br />east<br />
50. 50. Problem<br />48<br />The velocity of light in vacuum can be changed by changing<br />frequency <br />amplitude<br />wavelength <br />none of these<br />
51. 51. Problem<br />49<br />Why sun has elliptical shape when it rises and sets? It is due to<br />refraction <br />reflection<br />scattering <br />dispersion<br />
52. 52. Problem<br />50<br />Rutherford's a-scattering experiment concludes that<br />there is a heavy mass at centre<br />electrons are revolving around the nucleus<br />both (a) and (b)<br />none of these<br />
53. 53. For solution visit www.vasista.net<br />