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# AFMC Physics 2000

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• ### AFMC Physics 2000

1. 1. AFMC–Past papers<br />PHYSICS- UNSOLVED PAPER - 2000<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 />What is the weight of a 700 g wt body on a pianet whose mass is 1/7th of that of the earth and radius is 1/2 of earth<br />400 g.wt<br />300 g.wt<br />700 g.wt<br />500 g.wt.<br />
4. 4. Problem<br />02<br />Two masses m1 and m2 are suspended together by a massless spring of spring constant 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 />
5. 5. Problem<br />03<br />Three charges each equal to q are placed at corners of an equilateral triangle. If the force between any two charges is F, then net force on each charge will be <br />a. 3F<br />b. 2F<br />c.<br />d.<br />
6. 6. Problem<br />04<br />A moving charge produces<br />Electric field only<br />Magnetic field only<br />Both electric and magnetic field<br />None of these<br />
7. 7. Problem<br />05<br />The density of nucleus is of order of<br />103 kg/m3<br />1012kg/m3<br />1017 kg/m3<br />1024 kg/m3<br />
8. 8. Problem<br />06<br />The energy gap between conduction band and valence band is order of 0.07 eV. It is a<br />Insulator <br />Conductor<br />Semiconductor<br />Alloy<br />
9. 9. Problem<br />07<br />A wooden cube just floats inside water when a 200 g mass is placed on it. When the mass is removed the cube is 2 cm above water level. The size of cube is<br />5 cm <br />10 cm<br />15 cm <br />20 cm<br />
10. 10. Problem<br />08<br />A train is moving with a velocity of 25 m/s and a car is moving behind it by a velocity of 8 m/s in same direction. The relative velocity of train with respect to car is<br />17 m/s<br />33 m/s<br />17.5 m/s <br />None<br />
11. 11. Problem<br />09<br />Ratio of inertial mass to gravitational mass is<br />0.5<br />1<br />2<br />No fixed number<br />
12. 12. Problem<br />10<br />The resultant of two forces is 20 N. When one of the force is 20 √3N and angle between two forces is 30°. Then what is the value of second force?<br />10N <br />20 N<br />20√3 N<br />10 √3 N<br />
13. 13. Problem<br />11<br />In which medium sound travel faster?<br />Steel<br />Water<br />Air<br />Vacuum<br />
14. 14. Problem<br />12<br />The Bernoulli's theorem is based on the conservation of<br />Mass<br />Energy<br />Momentum<br />All<br />
15. 15. Problem<br />13<br />A bulb of 100 W, 220 V is operated on a line o 110 V, then what will be the power consumed<br />25 W<br />75 W<br />50 W<br />90 W.<br />
16. 16. Problem<br />14<br />When speed of 30 miles/hr is converted to ft/sec. then it will be<br />88 ft/sec<br />44 ft/sec<br />66 ft/sec<br />22 ft/sec<br />
17. 17. Problem<br />15<br />Specific resistance of a wire depends upon<br />Length<br />Cross-section are<br />Mass<br />None<br />
18. 18. Problem<br />16<br />In a simple pendulum if kinetic energy is on fourth of total energy, then displacement (x) I related to amplitude A, as<br />x = A<br />x = 2 A<br />X=√2/4A<br />X=√3/4A<br />
19. 19. Problem<br />17<br />The velocity of light in glass, whose refractive index is 1.5 is 2 x 108 m/s. In certain liquid, the velocity of light is found to be 2.6 x 108 m/s. The refractive index (µw) of that liquid is<br />1.15<br />1.2<br />1 <br />2.1<br />
20. 20. Problem<br />18<br />1 gm of ice at 0°C is mixed with 1 gm of water at 100°C. The resulting temperature will be<br />∞<br />10°C<br />0°C<br />5°C<br />
21. 21. Problem<br />19<br />An α-particle and a proton are accelerated at same potential difference from rest. Find the ratio of their final velocity.<br />√2 :1<br />1 : 1<br />1 : √2<br />1 : 2<br />
22. 22. Problem<br />20<br />Find the total displacement of a body in 8 sec. starting from rest with an acceleration of 20 cm/sec2.<br />0.064 m<br />640 cm<br />64 cm<br />64 m<br />
23. 23. Problem<br />21<br />If water in a closed bottle is taken up to the moon and opened, the water gets<br />Freeze<br />Boiled<br />Dissociated into O2 and H2<br />Evaporated<br />
24. 24. Problem<br />22<br />Speed of a 2 cm radius ball in a viscous liquid is 20 cm/s. Then the speed of 1 cm radius ball in the same liquid is<br />5 cm/s<br />10 cm/s<br />40 cm/s<br />80 cm/s<br />
25. 25. Problem<br />23<br />The displacement of a particle is given by Y = a + bt + ct2 - dt4. The initial velocity and acceleration are respectively<br />b, - 4 d<br />-b, 2c<br />b, 2c<br />2c, -Ad<br />
26. 26. Problem<br />24<br />Two soap bubbles of radii r] and r2 are joined together by thin surface. The radii of the two bubbles together is<br />a.r1 + r2<br />b.<br />c.<br />d.<br />
27. 27. Problem<br />25<br />A lens of refractive index 1.5 is dipped into a medium of refractive index 1.5. The new refractive index of lens is<br />1.5<br />1.5 x 1.5<br />1<br />1.5 + 1.5<br />
28. 28. Problem<br />26<br />A ball of mass a with a velocity b is made to hit a target of mass c and got embedded into it. Find the velocity of the final system. a ax.b<br />a.<br />b.<br />c.<br />d.<br />
29. 29. Problem<br />27<br />A planet which is twin sister of Earth is<br />Mercury<br />Venus<br />Mars<br />Jupiter<br />
30. 30. Problem<br />28<br />Terminal velocity of a body with radius r directly proportional to<br />R1<br />r 2<br />r -1<br />r2<br />
31. 31. Problem<br />29<br />A thief stole a box with valuable article of weight W and jumped down a wall of height h. Before he reached ground he experienced a load of<br />2 W <br />W<br />W/2<br />Zero<br />
32. 32. Problem<br />30<br />A bullet (m1 = 25 g) is fired with a velocity 400 m/s gets embedded into a bag of sand (m2 = 4.9 kg) suspended by a rope. The velocity gained by the bag is<br />0.2 m/s <br />8 m/s<br />4 m/s <br />2 m/s<br />
33. 33. Problem<br />31<br />If a planet consists of a satellite whose mass and radius are both half that of earth. Acceleration due to gravity (g) at its surface would be<br />4.9 m/s2<br />9.8 m/s2<br />19.6 m/s2<br />29.4 m/s2<br />
34. 34. Problem<br />32<br />In Young's experiment, fringe width was found to be 0.4 mm. If whole apparatus is immersed in water of refractive index (n) = 4/3, new fringe width is<br />0.25 mm<br />0.30 mm<br />0.40 mm <br />0.53 mm<br />
35. 35. Problem<br />33<br />Hollow spherical conductor with a charge of 500 it µC is acted upon by force 562.5 N. What is E at its surface?<br />Zero<br />1.125 x 10 6 N / C<br />2.25 x 106 N/C <br />4.5 x 106N/C<br />
36. 36. Problem<br />34<br />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 : 125<br />125 : 15 : 1<br />
37. 37. Problem<br />35<br />If we remove the atmosphere of earth then the duration of day will<br />Increase <br />Decrease<br />Will remain same<br />Depends upon season<br />
38. 38. Problem<br />36<br />The 1st excitation energy of hydrogen atoms is<br />9.23 x 10-9 J <br />9.23 x 10-15J<br />9.23 x 10-24J <br />None<br />
39. 39. Problem<br />37<br />A hydro electric plant is at 550 m higher than sea level and water is supplied from a height of 50 m above the sea level. Weight of water is 2000 kg. What is the power supply per sec, if efficiency is 80%<br />8 kW<br />10 kW<br />40 kW<br />9 kW<br />
40. 40. Problem<br />38<br />The velocity of light in vacuum can be changed by changing<br />Frequency<br />Amplitude<br />Wavelength<br />None of these<br />
41. 41. Problem<br />39<br />Rainbow is formed due to<br />Reflection<br />Refraction<br />Scattering<br />Dispersion<br />
42. 42. Problem<br />40<br />A 60 W bulb is hung over the centre of a 4 m x 4 m table at a height of 3 m, the ratio of the intensities of illumination at the centre of an edge and at a corner of table is<br />a.17/13<br />b.(17/3)3<br />c.<br />d. <br />
43. 43. Problem<br />41<br />The electric intensity due to a uniformly charged infinite cylinder of a radius R at a distance r (>R) from its axis is proportional to<br />r2<br />r3<br />1/r<br />1/r2<br />
44. 44. Problem<br />42<br />Two heaters coils separately take 10 min. and 5 min. to boil a certain amount of water. If both the coils are connected in series, the time taken will be<br />15 min<br />7.5 min<br />10/3Min<br />2.5 min<br />
45. 45. Problem<br />43<br />The speed of a boat is 5 km/hr in still water. If it crosses a river of width 1 km along the shortest possible path in 15 minutes, then velocity of the river water is<br />4 km/hr<br />3 km/hr<br />2 km/hr <br />1 km/hr<br />
46. 46. Problem<br />44<br />The frequency of a photon, having energy 100 eV is (h = 6.6 x 10-34 J-s)<br />2.42x 1026Hz <br />2.42 x 1016Hz<br />2.42 x 1012 Hz<br />2.42x109Hz<br />
47. 47. Problem<br />45<br />At a certain place the horizontal component of Earth's magnetic field is √3 times the vertical component. The angle of dip at that place is<br />75°<br />60°<br />45° <br />30°<br />
48. 48. Problem<br />46<br />A substance reduces to 1/16th of its original mass in 2 hours. Calculate the half-life of the substance<br />15 min<br />30 min<br />60 min<br />90 min<br />
49. 49. Problem<br />47<br />The quantum nature of light derives its evidence support from observation that<br />Radiation spectrum of black body<br />Light can be reflected<br />Light shows polarizing effects<br />Light can be diffracted<br />
50. 50. Problem<br />48<br />If coefficient of cubical expansion is x-times the coefficient of superficial expansion, then x is<br />2.5<br />1.5<br />3<br />2<br />
51. 51. Problem<br />49<br />An electric charge q moves with a velocity v ir a uniform magnetic field B. The forces experienced by the charge is<br />Zero, if B is perpendicular to v<br />Zero, if B is parallel to v<br />Always zero<br />Never zero<br />
52. 52. Problem<br />50<br />A gas behaves as ideal gas at<br />Low pressure and high temperature<br />High pressure and low temperature<br />Low pressure and low temperature<br />High pressure and high temperature<br />
53. 53. For solution visit www.vasista.net<br />