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AFMC Physics 2000

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    • 1. AFMC–Past papers
      PHYSICS- UNSOLVED PAPER - 2000
    • 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
      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
      400 g.wt
      300 g.wt
      700 g.wt
      500 g.wt.
    • 4. Problem
      02
      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
      a.
      b.
      c.
      d.
    • 5. Problem
      03
      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
      a. 3F
      b. 2F
      c.
      d.
    • 6. Problem
      04
      A moving charge produces
      Electric field only
      Magnetic field only
      Both electric and magnetic field
      None of these
    • 7. Problem
      05
      The density of nucleus is of order of
      103 kg/m3
      1012kg/m3
      1017 kg/m3
      1024 kg/m3
    • 8. Problem
      06
      The energy gap between conduction band and valence band is order of 0.07 eV. It is a
      Insulator
      Conductor
      Semiconductor
      Alloy
    • 9. Problem
      07
      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
      5 cm
      10 cm
      15 cm
      20 cm
    • 10. Problem
      08
      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
      17 m/s
      33 m/s
      17.5 m/s
      None
    • 11. Problem
      09
      Ratio of inertial mass to gravitational mass is
      0.5
      1
      2
      No fixed number
    • 12. Problem
      10
      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?
      10N
      20 N
      20√3 N
      10 √3 N
    • 13. Problem
      11
      In which medium sound travel faster?
      Steel
      Water
      Air
      Vacuum
    • 14. Problem
      12
      The Bernoulli's theorem is based on the conservation of
      Mass
      Energy
      Momentum
      All
    • 15. Problem
      13
      A bulb of 100 W, 220 V is operated on a line o 110 V, then what will be the power consumed
      25 W
      75 W
      50 W
      90 W.
    • 16. Problem
      14
      When speed of 30 miles/hr is converted to ft/sec. then it will be
      88 ft/sec
      44 ft/sec
      66 ft/sec
      22 ft/sec
    • 17. Problem
      15
      Specific resistance of a wire depends upon
      Length
      Cross-section are
      Mass
      None
    • 18. Problem
      16
      In a simple pendulum if kinetic energy is on fourth of total energy, then displacement (x) I related to amplitude A, as
      x = A
      x = 2 A
      X=√2/4A
      X=√3/4A
    • 19. Problem
      17
      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
      1.15
      1.2
      1
      2.1
    • 20. Problem
      18
      1 gm of ice at 0°C is mixed with 1 gm of water at 100°C. The resulting temperature will be

      10°C
      0°C
      5°C
    • 21. Problem
      19
      An α-particle and a proton are accelerated at same potential difference from rest. Find the ratio of their final velocity.
      √2 :1
      1 : 1
      1 : √2
      1 : 2
    • 22. Problem
      20
      Find the total displacement of a body in 8 sec. starting from rest with an acceleration of 20 cm/sec2.
      0.064 m
      640 cm
      64 cm
      64 m
    • 23. Problem
      21
      If water in a closed bottle is taken up to the moon and opened, the water gets
      Freeze
      Boiled
      Dissociated into O2 and H2
      Evaporated
    • 24. Problem
      22
      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
      5 cm/s
      10 cm/s
      40 cm/s
      80 cm/s
    • 25. Problem
      23
      The displacement of a particle is given by Y = a + bt + ct2 - dt4. The initial velocity and acceleration are respectively
      b, - 4 d
      -b, 2c
      b, 2c
      2c, -Ad
    • 26. Problem
      24
      Two soap bubbles of radii r] and r2 are joined together by thin surface. The radii of the two bubbles together is
      a.r1 + r2
      b.
      c.
      d.
    • 27. Problem
      25
      A lens of refractive index 1.5 is dipped into a medium of refractive index 1.5. The new refractive index of lens is
      1.5
      1.5 x 1.5
      1
      1.5 + 1.5
    • 28. Problem
      26
      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
      a.
      b.
      c.
      d.
    • 29. Problem
      27
      A planet which is twin sister of Earth is
      Mercury
      Venus
      Mars
      Jupiter
    • 30. Problem
      28
      Terminal velocity of a body with radius r directly proportional to
      R1
      r 2
      r -1
      r2
    • 31. Problem
      29
      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
      2 W
      W
      W/2
      Zero
    • 32. Problem
      30
      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
      0.2 m/s
      8 m/s
      4 m/s
      2 m/s
    • 33. Problem
      31
      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
      4.9 m/s2
      9.8 m/s2
      19.6 m/s2
      29.4 m/s2
    • 34. Problem
      32
      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
      0.25 mm
      0.30 mm
      0.40 mm
      0.53 mm
    • 35. Problem
      33
      Hollow spherical conductor with a charge of 500 it µC is acted upon by force 562.5 N. What is E at its surface?
      Zero
      1.125 x 10 6 N / C
      2.25 x 106 N/C
      4.5 x 106N/C
    • 36. Problem
      34
      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
      1 : 3 : 5
      5 : 3 : 1
      1 : 15 : 125
      125 : 15 : 1
    • 37. Problem
      35
      If we remove the atmosphere of earth then the duration of day will
      Increase
      Decrease
      Will remain same
      Depends upon season
    • 38. Problem
      36
      The 1st excitation energy of hydrogen atoms is
      9.23 x 10-9 J
      9.23 x 10-15J
      9.23 x 10-24J
      None
    • 39. Problem
      37
      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%
      8 kW
      10 kW
      40 kW
      9 kW
    • 40. Problem
      38
      The velocity of light in vacuum can be changed by changing
      Frequency
      Amplitude
      Wavelength
      None of these
    • 41. Problem
      39
      Rainbow is formed due to
      Reflection
      Refraction
      Scattering
      Dispersion
    • 42. Problem
      40
      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
      a.17/13
      b.(17/3)3
      c.
      d.
    • 43. Problem
      41
      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
      r2
      r3
      1/r
      1/r2
    • 44. Problem
      42
      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
      15 min
      7.5 min
      10/3Min
      2.5 min
    • 45. Problem
      43
      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
      4 km/hr
      3 km/hr
      2 km/hr
      1 km/hr
    • 46. Problem
      44
      The frequency of a photon, having energy 100 eV is (h = 6.6 x 10-34 J-s)
      2.42x 1026Hz
      2.42 x 1016Hz
      2.42 x 1012 Hz
      2.42x109Hz
    • 47. Problem
      45
      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
      75°
      60°
      45°
      30°
    • 48. Problem
      46
      A substance reduces to 1/16th of its original mass in 2 hours. Calculate the half-life of the substance
      15 min
      30 min
      60 min
      90 min
    • 49. Problem
      47
      The quantum nature of light derives its evidence support from observation that
      Radiation spectrum of black body
      Light can be reflected
      Light shows polarizing effects
      Light can be diffracted
    • 50. Problem
      48
      If coefficient of cubical expansion is x-times the coefficient of superficial expansion, then x is
      2.5
      1.5
      3
      2
    • 51. Problem
      49
      An electric charge q moves with a velocity v ir a uniform magnetic field B. The forces experienced by the charge is
      Zero, if B is perpendicular to v
      Zero, if B is parallel to v
      Always zero
      Never zero
    • 52. Problem
      50
      A gas behaves as ideal gas at
      Low pressure and high temperature
      High pressure and low temperature
      Low pressure and low temperature
      High pressure and high temperature
    • 53. For solution visit www.vasista.net