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AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
AFMC Physics  1995
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AFMC Physics 1995

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    • 1. AFMC–Past papers
      PHYSICS- UNSOLVED PAPER - 1995
    • 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
      In figure the potentiometer wire AB has a resistance of 5Ω and length 10 m the balancing length AJ for the e.m.f of 0.4 V is
      0.8m
      4m
      0.4m
      1.5m
    • 4. Problem
      02
      The primary winding of a transformer has 500 turns whereas its secondary has 5000 turns. The primary is connected to an AC supply 20 V, 50 Hz. The Secondary will have an output of
      2 v , 50 Hz
      200V, 50 Hz
      2V, 5Hz
      200V, 500Hz
    • 5. Problem
      03
      The blue color of the sky is due to the phenomenon of
      Scattering
      Reflection
      Dispersion
      Refraction
    • 6. Problem
      04
      The capacity of a parallel plate capacitor increases with the
      Increase of its area
      Decrease of its area
      Increase of its distance
      None of these
    • 7. Problem
      05
      A student has 10 resistors of resistance r. The minimum resistance made by him from the give resistors is
      r/100
      10r
      r/5
      r/10
    • 8. Problem
      06
      Which one of the following gates correspond to the truth table given below
      NAND
      XOR
      NOR
      OR
    • 9. Problem
      07
      Which of the following quantity is expressed as force per unit area?
      Volume
      Work
      Area
      Pressure
    • 10. Problem
      08
      The displacement-time graph of a moving particle is shown below. The instantaneous velocity of the particle is negative as the point
      E
      F
      C
      D
    • 11. Problem
      09
      The equation constant. The unit of a is
      Dyne/cm3
      Dyne/cm5
      Dyne x cm2
      Dyne x cm4
    • 12. Problem
      10
      Water falls from a height of 800 m. if whole of its energy changes to heat, what would be the rise in its temperature when it reaches the ground (1 kcal=4200J)
      1.860c
      1.180c
      00c
      0.530c
    • 13. Problem
      11
      The twinkling of stars is due to the
      Refractive index of the earth’s atmosphere fluctuates
      Fact that stars do not emit light continuously
      Both (a) and (b)
      None of these
    • 14. Problem
      12
      At sun rise or sunset, the sun looks more red than at mid-day, because of the
      Effects of refraction
      Sun is hottest at these times
      Effects of diffraction
      Scattering of light
    • 15. Problem
      13
      The volume of atoms to the volume of nit cell is called
      Coordination number
      Packing fraction
      Lattice parameter
      Packing coefficient
    • 16. Problem
      14
      a body moves due east with velocity 20km/hour and then due north with velocity 15 km/hour. The resultant velocity
      20 km/hour
      5 km/hour
      25 km/hour
      15 km/hour
    • 17. Problem
      15
      A dip circle is at right angle to the magnetic meridian. What will be its apparent dip?
      600
      00
      900
      300
    • 18. Problem
      16
      Six resistors of 3Ω each are connected along the sides of a hexagon and three resistors of 6Ω each are connected along AC, AD and AE as shown in the figure. The equivalent resistance between A and B is equal to
      2 Ω
      3 Ω
      6 Ω
      9 Ω
    • 19. Problem
      17
      The direction of magnetic field line of bar magnet is
      Across the bar magnet
      From south pole to north pole
      From south pole to north pole inside the magnet and from north pole to south pole outside the magnet
      From north pole to south pole
    • 20. Problem
      18
      When Ge crystals are doped with phosphorus atom, then it becomes
      n-type semiconductor
      insulator
      superconductor
      p-type semiconductor
    • 21. Problem
      19
      In which radioactive disintegration, neutron dissociates into proton and electron?
      λ- emission
      He++ emission
      Positron emission
      Β-emission
    • 22. Problem
      20
      The focal length of convex lens is 30cm and the distance of image is quarter of the object, then the object distance is
      40cm
      90cm
      30cm
      60cm
    • 23. Problem
      21
      When the number of turns and length of a solenoid are doubled, keeping the area of cross-section same, the inductance
      Is doubled
      Is halved
      Becomes four times
      Remains the same
    • 24. Problem
      22
      A solenoid is at potential difference of 60V. if the current flowing through it is 15 ampere, then resistance of the coil will be
      0.25 Ω
      4 Ω
      2 Ω
      8 Ω
    • 25. Problem
      23
      Bending of light about the corner of an obstacle sharp edged is called
      Polarization
      Deviation
      Diffraction
      Dispersion
    • 26. Problem
      24
      If a source of light is moving away from a stationary observer, then frequency of light wave appears to change because of
      Diffraction
      Doppler’s effect
      Refraction
      Interference
    • 27. Problem
      25
      The reciprocal of resistance is
      Voltage
      Conductance
      Current
      Resistivity
    • 28. Problem
      26
      In the case of forward biasing of p-n junction, which one of the following figures correctly depicts the direction of flow of carriers?
      a.
      b.
      c.
      d.
    • 29. Problem
      27
      A galvanometer is converted into ammeter, when we connect
      Low resistance in series
      High resistance in series
      Low resistance in parallel
      High resistance in parallel
    • 30. Problem
      28
      In an experiment with Kund’s tube the distance between consecutive nodes is 5 cm when air is inside, and it is 13.4 cm when hydrogen is inside calculate the velocity of sound in hydrogen(speed of sound in air = 330m/s)
      424m/s
      884.4 m/s
      1024.8 m/s
      864.4 m/s
    • 31. Problem
      29
      The splitting of line into groups under the effect of electric or magnetic field is called
      Heisenberg's effect
      Bohr’s effect
      Magnetic effect
      Zeeman’s effect
    • 32. Problem
      30
      Two open organ pipes of length 25 cm and 25.5 cm produce 0.1 beats/sec. the velocity of sound is
      303 m/s
      350 m/s
      255 m/s
      325.5 m/s
    • 33. Problem
      31
      On the absolute scale of temperature given by Kelvin, steam point has a value of
      -273 K
      373 K
      0 K
      273 K
    • 34. Problem
      32
      If the radius of curvature of convex mirror is 40 cm and distance of image is twice as that of object, then the object distance is
      30 cm
      60 cm
      20 cm
      40 cm
    • 35. Problem
      33
      The minimum energy required to remove an electron is called
      Stopping potential
      Work function
      Potential energy
      Kinetic energy
    • 36. Problem
      34
      Two waves of the same frequency and intensity superimpose with each other in opposite phases after the superposition, the
      Frequency increases by 4 times
      Intensity increases by 4 times
      Intensity increases by two times
      None of these 
    • 37. Problem
      35
      The sensitivity of a tangent galvanometer is increased, if
      Field is increased
      Number of turns decreased
      Field is decreased
      Number of turns increased
    • 38. Problem
      36
      The resistance of a wire is R. If the length of the wire is doubled, then its resistance will be
      R
      2R
      0.25 R
      4 R
    • 39. Problem
      37
      Which of the following has a negative temperature coefficient?
      Man
      C
      Ag
      Fe
    • 40. Problem
      38
      Radiation emitted by a surface is directly proportional to
      Twice power of its temperature
      Third power of its temperature
      Equal to its temperature
      Fourth power of its temperature
    • 41. Problem
      39
      A rectangle ABCD is such that BC = 2 AB. The moment of inertia along axis will be minimum through
      HF
      BC
      EG
      BD
    • 42. Problem
      40
      In an isothermal expansion, the pressure is determined by
      Compressibility only
      Temperature only
      Both (a) and (b)
      None of these
    • 43. Problem
      41
      Monochromatic light wave means
      A beam of white colour
      A beam of the same colour
      A cluster of beam of different colours
      None of these
    • 44. Problem
      42
      Time period of a simple pendulum will be double, if we
      Decrease the length 4 times
      Increase the length 4 times
      Decrease the length 2 times
      Increase the length 2 times
    • 45. Problem
      43
      Soap bubble appears coloured due to the phenomenon of
      Dispersion
      Interference
      Reflection
      Diffraction
    • 46. Problem
      44
      The translational kinetic energy of gas, for one mole of the gas, is equal to
      a.
      b.
      c.
      d.
    • 47. Problem
      45
      If we move from equator to pole, the value of g
      Remains the same
      Increases
      Decreases
      First (b) then (c)
    • 48. Problem
      46
      If the critical temperature of CO2 is 31.10C and room temperature is 400C, then CO2 behaves as
      Liquid
      Gas
      Gas and vapour
      Vapour
    • 49. Problem
      47
      The minimum wavelength of the X-rays produced by electrons accelerated through a potential difference of V volts is directly proportional to
      1/√V
      √V
      1/V
      V2
    • 50. Problem
      48
      A bullet of mass 0.1 kg is fired with a speed of 100m/sec, the mass of gun is 50 kg. The velocity of recoil is
      0.5 m/sec
      0.2 m/sec
      0.05 m/sec
      0.1 m/sec
    • 51. Problem
      49
      A hollow metallic sphere of radius 10 cm is charged such that potential of its surface is 70 volts. The potential at the centre of the sphere would be
      70V
      0V
      700V
      7V
    • 52. Problem
      50
      A ball is thrown upwards with a velocity of 100m/sec. it will reach the ground after
      10 sec
      40 sec
      5 sec
      20 sec
    • 53. For solution visit www.vasista.net

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