AFMC Physics 2008

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  • AFMC Physics 2008

    1. 1. AFMC–Past papers<br />PHYSICS - UNSOLVED PAPER - 2008<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 />Given in a meter bridge experiment; l2 = 240 cm, l1 = 120 cm, R = 2Ω. Then value of r will be<br />2 Ω <br />2.5 Ω<br />1 Ω <br />4 Ω<br />
    4. 4. Problem<br />02<br />If the rms speed of a given gas at 0°C is 0.5 m/s, then what will be its velocity at 819°C?<br />2 m/s <br />0.5 m/s<br />1 m/s <br />1.5 m/s<br />
    5. 5. Problem<br />03<br />A rocket of mass 120 kg is moving vertically up at 600 m/s such that gas is escaping at the rate of i kg per second. Find out acceleration of the rocket.<br />2 m/s2<br />5 m/s2<br />6 m/s2<br />10 m/s2<br />
    6. 6. Problem<br />04<br />A block is released from an inclined plane of inclination 45°. Find out the acceleration of the block down the incline, if friction coefficient between block and the incline is 0.5.<br />6√2 m/s2<br />√2 m/s2<br />10 √2 m/s2<br />6/ √2 m/s2<br />
    7. 7. Problem<br />05<br />In an n - p - n transistor, p acts as<br />emitter <br />base<br />collector <br />emitter or collector<br />
    8. 8. Problem<br />06<br />The conversion of N2 to 02 was first discovered by Rutherford in the year<br />1919 <br />1901<br />1921 <br />1942<br />
    9. 9. Problem<br />07<br />What will be the change in time period of a simple pendulum in a space where value of acceleration due to gravity decreases 10 times? Given T to be the time period at the surface of earth.<br />T <br />10 T<br />√10<br />5 T<br />
    10. 10. Problem<br />08<br />In case of a satellite, if the area of coverage becomes 3 times than that for an antenna of height 200 m. The height of antenna which has the same coverage is<br />600 m <br />300 m<br />1200 m<br />900 m<br />
    11. 11. Problem<br />09<br />When a small spherical ball is dropped in a viscous liquid filled in a glass tube its terminal velocity depends upon<br />height of cylinder<br />radius of glass tube<br />radius of ball <br />none of these<br />
    12. 12. Problem<br />10<br />If units of force and length become 3 times then what will be the value of energy E = 81 J, in newunits?<br />81 J <br />9 J<br />729 J <br />700 J<br />
    13. 13. Problem<br />11<br />A particle of mass m moves towards north at speed v collides perfectly inelastically with another particle of mass m moving toward east at same speed. The speed at which they move after collision is<br /> √2v <br />v<br />( v / √2 )<br /> √2 v<br />
    14. 14. Problem<br />12<br />A rigid body rotating about a fixed axis at an angular velocity 20 rad/sec has kinetic energy 360 J. Moment of inertia of the body about the fixed axis is<br />1.8 kg-m2<br />18kg-m2<br />2.5 kg-m2<br />4 kg-m2<br />
    15. 15. Problem<br />13<br />If mass is increased 4 times, then the time period of a magnetometer when suspended in earth's magnetic field becomes <br />double <br />quadruple<br />half <br />decreases 4 times<br />
    16. 16. Problem<br />14<br />A string of length 2 m vibrated with a tuning fork forms four loops. The distance between two consecutive nodes is<br />0.2 m <br />0.5 m<br />2 m <br />1 m<br />
    17. 17. Problem<br />15<br />The phase difference between the current and voltage is<br />45°<br />30°<br />50°<br />90°<br />
    18. 18. Problem<br />16<br />At the minimum deviation position the angle between incident ray and refracted ray is 60°. Angle of deviation is<br />30° <br />60°<br />120° <br />180°<br />
    19. 19. Problem<br />17<br />If resistance is halved (keeping all other parameters same), the heat produced across resistor becomes <br />double <br />quadruple<br />halved <br />no change<br />image*<br />
    20. 20. Problem<br />18<br />In the given figure, internal resistance of the cell is<br />2 Ω <br />2.5 Ω<br />1 Ω <br />1.5 Ω<br />
    21. 21. Problem<br />19<br />Dimensional formula of stress is<br />[ML-1T2]<br />[ML-1T-2]<br />[ML-1T-1 ] <br />[MLT-2]<br />
    22. 22. Problem<br />20<br />A train 200 m long enters at 5 m/s and exits at 3 m/s from a bridge 300 m long. The time taken by it is<br />125 s <br />500 s<br />250 s <br />100 s<br />
    23. 23. Problem<br />21<br />A particle is projected vertically upwards at 30 m/s. The distance travelled in the 1st second of motion is<br />20 m <br />25 m<br />15 m <br />30 m<br />
    24. 24. Problem<br />22<br />If 300 J of heat is given, then find outthe maxim l work that can be done.<br />200 J <br />150 J<br />100 J <br />300 J<br />
    25. 25. Problem<br />23<br />For two particles performing SHM with phase difference 90° and same amplitude, if maximum velocity of 1st particle is v, then what will be the maximum velocity of 2nd particle.<br />2v <br />3v<br />v <br />v/2<br />
    26. 26. Problem<br />24<br />In SHM, expression for acceleration can be<br />-Aω2 sin (ωt) <br />-Aω sin (ωt)<br />Aω2 sin (ωt)<br />Aω sin (t/ω)<br />
    27. 27. Problem<br />25<br />Deflection power is maximum for<br />Radio waves <br />X-rays<br />y-rays <br />none of these<br />
    28. 28. Problem<br />26<br />If volume of a body changes keeping length same then the value of Poisson's ratio will be<br />0.2 <br />0.5<br />0.1 <br />0.8<br />
    29. 29. Problem<br />27<br />Thermionic emissions are related to<br />conduction <br />convection<br />radiation <br />none of these<br />
    30. 30. Problem<br />28<br />if sink is at a temperature of -39°C and source 0°C, then efficiency will be<br />39.4% <br />14.2%<br />35.2% <br />45.5%<br />
    31. 31. Problem<br />29<br />If maximum range of a projectile is 400 m, then what will be its maximum height ?<br />50 m <br />200 m<br />100 m <br />400 m<br />
    32. 32. Problem<br />30<br />A particle moves in a circular motion with radius 10 m at 20 m/s. It is given an acceleration of 30 m/s2. Find out its resultant acceleration.<br />20 m/s2<br />50 m/s2<br />60 m/s2<br />25 m/s2<br />
    33. 33. Problem<br />31<br />Wavelength of red light is<br />2000 A<br />5000 A<br />4000 A<br />6000 A<br />
    34. 34. Problem<br />32<br />In a telescope of length 20 cm magnification is 9. fv and fe are respectively.<br />18,2 <br />11,9<br />15,5 <br />10,10<br />
    35. 35. Problem<br />33<br />Wave produced in a sonometer wire is<br />transverse - progessive<br />longitudinal - progessive<br />transverse - standing<br />longitudinal -standing<br />
    36. 36. Problem<br />34<br />The magnification of a simple microscope with focal length of eye piece 5 cm, and minimum distance of distinct vision 25 cm is<br />6 <br />6/5<br />5 <br />5/6<br />
    37. 37. Problem<br />35<br />The speed at which mass becomes double that of rest mass is<br />0.87 c <br />0.6 c<br />0.8 c <br />0.5 c<br />
    38. 38. Problem<br />36<br />Find out the force on the wire of length 2 cm. <br />2 x 10-8 N<br />3 x 10-8N<br />2 x 10-7 N<br />8 x 10-6 N<br />
    39. 39. Problem<br />37<br />In a deflection magnetometer, the time period of a magnet is found to be 8 sec. If the magnetic moment of another magnet is 1/4 of the first one, what is the time period of the latter ?<br />8 sec <br />4 sec<br />2 sec <br />16 sec<br />
    40. 40. Problem<br />38<br />How much work can be obtained from 100 calories of heat energy ?<br />100 J <br />420 J<br />42 J <br />4200 J<br />
    41. 41. Problem<br />39<br />What is the escape velocity of earth ?<br />11 km/s <br />110 km/s<br />660 km/min <br />38600 km/hr<br />
    42. 42. Problem<br />40<br />If the coil of a heater is cut to half, what would happen to heat produced ?<br />doubled <br />halved<br />remains same <br />becomes four times<br />
    43. 43. Problem<br />41<br />Iron is used in the core of transformers because of<br />high hysteresis loss, low permeability<br />high hysteresis loss, high permeability<br />low hysteresis loss, low permeability<br />low hysteresis loss, high permeability<br />
    44. 44. Problem<br />42<br />Two samples have half lives t and 21 respectively. After a time period of 6/, what would be the ratio of undecayed atoms in the two samples ?<br />1 : 4 <br />1 : 2<br />1 : 8 <br />1 : 1<br />
    45. 45. Problem<br />43<br />If E energy is required to project a body with speed v, what is the energy required to give an initial speed of 2v to the body?<br />E <br />2E<br />4E <br />E/2<br />
    46. 46. Problem<br />44<br />If decays into ^ N p , the other decay products are<br />positron and neutrino<br />neutron and antineutrino<br />electron and neutrino<br />electron and antineutrino<br />
    47. 47. Problem<br />45<br />The energy needed to ionise a singly ionised He is<br />-13.6 eV<br />13.6 eV<br />54.4 eV<br />-54.4 eV<br />
    48. 48. Problem<br />46<br />If in a tube of length /, one gets frequencies 3v1, 5v1 the tube is<br />open at one end <br />open at both the ends<br />closed at both ends<br />none of these<br />
    49. 49. Problem<br />47<br />A particle covers 150m in 8th second starting from rest, its acceleration is<br />15 m/s2<br />20 m/s2<br />10 m/s2<br />8 m/s2<br />
    50. 50. Problem<br />48<br />When radioactive decay takes place<br />one gets only heavy particles and not electromagnetic waves<br />one can get heavy and light particles<br />one can get heavy and light particles with electromagnetic waves and antiparticles.<br />one cannot get antiparticles<br />
    51. 51. Problem<br />49<br />If an X-ray tube with copper target, produce Ka rays<br />one has to give energy equal to that of Ka rays<br />one can get X-rays at any accelerating potential of the electrons<br />one has to give sufficient energy to ionise the electron from the K shell<br />one gets only characteristic X-rays if energy is less than K level energy of copper.<br />
    52. 52. Problem<br />50<br />In mass spectrometers the principle that is used is<br />electrostatic force only<br />Lorentz force<br />gravitational force<br />all of these<br />
    53. 53. For solution visit www.vasista.net<br />

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