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AFMC Physics 2008

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    • 1. AFMC–Past papers
      PHYSICS - UNSOLVED PAPER - 2008
    • 2. SECTION – A
      Single Correct Answer Type
      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
    • 3. Problem
      01
      Given in a meter bridge experiment; l2 = 240 cm, l1 = 120 cm, R = 2Ω. Then value of r will be
      2 Ω
      2.5 Ω
      1 Ω
      4 Ω
    • 4. Problem
      02
      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?
      2 m/s
      0.5 m/s
      1 m/s
      1.5 m/s
    • 5. Problem
      03
      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.
      2 m/s2
      5 m/s2
      6 m/s2
      10 m/s2
    • 6. Problem
      04
      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.
      6√2 m/s2
      √2 m/s2
      10 √2 m/s2
      6/ √2 m/s2
    • 7. Problem
      05
      In an n - p - n transistor, p acts as
      emitter
      base
      collector
      emitter or collector
    • 8. Problem
      06
      The conversion of N2 to 02 was first discovered by Rutherford in the year
      1919
      1901
      1921
      1942
    • 9. Problem
      07
      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.
      T
      10 T
      √10
      5 T
    • 10. Problem
      08
      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
      600 m
      300 m
      1200 m
      900 m
    • 11. Problem
      09
      When a small spherical ball is dropped in a viscous liquid filled in a glass tube its terminal velocity depends upon
      height of cylinder
      radius of glass tube
      radius of ball
      none of these
    • 12. Problem
      10
      If units of force and length become 3 times then what will be the value of energy E = 81 J, in newunits?
      81 J
      9 J
      729 J
      700 J
    • 13. Problem
      11
      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
      √2v
      v
      ( v / √2 )
      √2 v
    • 14. Problem
      12
      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
      1.8 kg-m2
      18kg-m2
      2.5 kg-m2
      4 kg-m2
    • 15. Problem
      13
      If mass is increased 4 times, then the time period of a magnetometer when suspended in earth's magnetic field becomes
      double
      quadruple
      half
      decreases 4 times
    • 16. Problem
      14
      A string of length 2 m vibrated with a tuning fork forms four loops. The distance between two consecutive nodes is
      0.2 m
      0.5 m
      2 m
      1 m
    • 17. Problem
      15
      The phase difference between the current and voltage is
      45°
      30°
      50°
      90°
    • 18. Problem
      16
      At the minimum deviation position the angle between incident ray and refracted ray is 60°. Angle of deviation is
      30°
      60°
      120°
      180°
    • 19. Problem
      17
      If resistance is halved (keeping all other parameters same), the heat produced across resistor becomes
      double
      quadruple
      halved
      no change
      image*
    • 20. Problem
      18
      In the given figure, internal resistance of the cell is
      2 Ω
      2.5 Ω
      1 Ω
      1.5 Ω
    • 21. Problem
      19
      Dimensional formula of stress is
      [ML-1T2]
      [ML-1T-2]
      [ML-1T-1 ]
      [MLT-2]
    • 22. Problem
      20
      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
      125 s
      500 s
      250 s
      100 s
    • 23. Problem
      21
      A particle is projected vertically upwards at 30 m/s. The distance travelled in the 1st second of motion is
      20 m
      25 m
      15 m
      30 m
    • 24. Problem
      22
      If 300 J of heat is given, then find outthe maxim l work that can be done.
      200 J
      150 J
      100 J
      300 J
    • 25. Problem
      23
      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.
      2v
      3v
      v
      v/2
    • 26. Problem
      24
      In SHM, expression for acceleration can be
      -Aω2 sin (ωt)
      -Aω sin (ωt)
      Aω2 sin (ωt)
      Aω sin (t/ω)
    • 27. Problem
      25
      Deflection power is maximum for
      Radio waves
      X-rays
      y-rays
      none of these
    • 28. Problem
      26
      If volume of a body changes keeping length same then the value of Poisson's ratio will be
      0.2
      0.5
      0.1
      0.8
    • 29. Problem
      27
      Thermionic emissions are related to
      conduction
      convection
      radiation
      none of these
    • 30. Problem
      28
      if sink is at a temperature of -39°C and source 0°C, then efficiency will be
      39.4%
      14.2%
      35.2%
      45.5%
    • 31. Problem
      29
      If maximum range of a projectile is 400 m, then what will be its maximum height ?
      50 m
      200 m
      100 m
      400 m
    • 32. Problem
      30
      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.
      20 m/s2
      50 m/s2
      60 m/s2
      25 m/s2
    • 33. Problem
      31
      Wavelength of red light is
      2000 A
      5000 A
      4000 A
      6000 A
    • 34. Problem
      32
      In a telescope of length 20 cm magnification is 9. fv and fe are respectively.
      18,2
      11,9
      15,5
      10,10
    • 35. Problem
      33
      Wave produced in a sonometer wire is
      transverse - progessive
      longitudinal - progessive
      transverse - standing
      longitudinal -standing
    • 36. Problem
      34
      The magnification of a simple microscope with focal length of eye piece 5 cm, and minimum distance of distinct vision 25 cm is
      6
      6/5
      5
      5/6
    • 37. Problem
      35
      The speed at which mass becomes double that of rest mass is
      0.87 c
      0.6 c
      0.8 c
      0.5 c
    • 38. Problem
      36
      Find out the force on the wire of length 2 cm.
      2 x 10-8 N
      3 x 10-8N
      2 x 10-7 N
      8 x 10-6 N
    • 39. Problem
      37
      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 ?
      8 sec
      4 sec
      2 sec
      16 sec
    • 40. Problem
      38
      How much work can be obtained from 100 calories of heat energy ?
      100 J
      420 J
      42 J
      4200 J
    • 41. Problem
      39
      What is the escape velocity of earth ?
      11 km/s
      110 km/s
      660 km/min
      38600 km/hr
    • 42. Problem
      40
      If the coil of a heater is cut to half, what would happen to heat produced ?
      doubled
      halved
      remains same
      becomes four times
    • 43. Problem
      41
      Iron is used in the core of transformers because of
      high hysteresis loss, low permeability
      high hysteresis loss, high permeability
      low hysteresis loss, low permeability
      low hysteresis loss, high permeability
    • 44. Problem
      42
      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 ?
      1 : 4
      1 : 2
      1 : 8
      1 : 1
    • 45. Problem
      43
      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?
      E
      2E
      4E
      E/2
    • 46. Problem
      44
      If decays into ^ N p , the other decay products are
      positron and neutrino
      neutron and antineutrino
      electron and neutrino
      electron and antineutrino
    • 47. Problem
      45
      The energy needed to ionise a singly ionised He is
      -13.6 eV
      13.6 eV
      54.4 eV
      -54.4 eV
    • 48. Problem
      46
      If in a tube of length /, one gets frequencies 3v1, 5v1 the tube is
      open at one end
      open at both the ends
      closed at both ends
      none of these
    • 49. Problem
      47
      A particle covers 150m in 8th second starting from rest, its acceleration is
      15 m/s2
      20 m/s2
      10 m/s2
      8 m/s2
    • 50. Problem
      48
      When radioactive decay takes place
      one gets only heavy particles and not electromagnetic waves
      one can get heavy and light particles
      one can get heavy and light particles with electromagnetic waves and antiparticles.
      one cannot get antiparticles
    • 51. Problem
      49
      If an X-ray tube with copper target, produce Ka rays
      one has to give energy equal to that of Ka rays
      one can get X-rays at any accelerating potential of the electrons
      one has to give sufficient energy to ionise the electron from the K shell
      one gets only characteristic X-rays if energy is less than K level energy of copper.
    • 52. Problem
      50
      In mass spectrometers the principle that is used is
      electrostatic force only
      Lorentz force
      gravitational force
      all of these
    • 53. For solution visit www.vasista.net

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