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AFMC Physics  1996
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AFMC Physics 1996

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AFMC Physics 1996 Presentation Transcript

  • 1. AFMC–Past papers
    PHYSICS- UNSOLVED PAPER - 1996
  • 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
    A ball is dropped from 10m. it is embedded in sand by 15 mm and then stops, which of the following is conserved?
    Temperature
    Momentum
    Kinetic energy
    Both (a) and (c)
  • 4. Problem
    02
    If we consider electrons and photons of the same wavelength, then they will have same
    Momentum
    Energy
    Angular momentum
    Velocity
  • 5. Problem
    03
    Equation for the change of state was given by
    Newton
    Clausius
    Clausius-clapeyron
    Joules
  • 6. Problem
    04
    If n small balls, each of mass m impinge elastically each second on a surface with a velocity u, then the force experienced by the surface in one second will be
    0.5 mnu
    1 mnu
    2 mnu
    4mnu
  • 7. Problem
    05
    Velocity of light is maximum in
    Glass
    Diamond
    Vacuum
    water
  • 8. Problem
    06
    The equation of sound wave is Y=0.0015 sin(62.4x+316t) the wavelength of this wave is
    0.2 unit
    0.1 unit
    0.3 unit
    0.4 unit
  • 9. Problem
    07
    In an adiabatic expansion of a gas
    Temperature is kept constant
    Heat is gained or lost
    Volume is kept constant
    Heat is neither gained nor lost
  • 10. Problem
    08
    The dew point and atmospheric temperature on a particular day is found to be 180 c and 250c. if saturation vapour pressure at 180c 250c be 15.5 mm and 25.7 mm of Hg, its relative humidity is
    90%
    30.0%
    Not possible to calculate
    60.3%
  • 11. Problem
    09
    The surface tension of a liquid is 108 dyne/cm2. It is equivalent to
    105 N/m
    107 N/m
    104 N/m
    106 N/m
  • 12. Problem
    10
    When the key K is pressed at time t = 0, then which of the following statement about the current I in the resistor AB of the given circuit is true?
    I oscillates between 1 mA and 2mA
    I = 1 mA at all t
    At t=0, I=2mA and with time it goes to 1mA
    I = 2mA and at all t
  • 13. Problem
    11
    Davy’s safety lamp is based on
    Convection
    Radiation
    Polarization
    Conduction
  • 14. Problem
    12
    R.M.S velocity of a particle is v at pressure P. If the pressure increases by two times, then R.M.S velocity will become
    2 v
    0.5 v
    4 v
    v
  • 15. Problem
    13
    light waves are transverse, because they
    are polarized
    reflect
    are not polarized
    refract
  • 16. Problem
    14
    In a hydrogen discharge tube, it is observed that through a given cross-section 3.13 x 1015 electrons are moving from right to left and 3.12*1015 protons are moving from left to right. What is the electric current in the discharge tube and what is its direction?
    2 mA towards right
    1 mA towards right
    2 mA towards left
    1 mA towards left
  • 17. Problem
    15
    When current flows in a conductor, then the ratio of the intensity of electric field E at any point within the conductor and the current density at a point is called
    Specific resistance
    Resistance
    Inductance
    Conductance
  • 18. Problem
    16
    A man is standing on a spring platform. Reading of spring balance is 60 kg wt. if man jumps outside from the platform, then reading of spring balance.
    Decrease to zero
    Increase
    Remain same
    First (b) then (a)
  • 19. Problem
    17
    A thermo flask is polished well
    To absorb all radiation from outside
    To make attractive
    To reflect all radiation from outside
    For shining
  • 20. Problem
    18
    What percent of original radioactive atoms is left after five half-lives?
    5%
    20%
    3%
    10%
  • 21. Problem
    19
    If the coefficient of friction of a plane inclined at 300 is 0.4 then acceleration of a body sliding freely on it is (g = 9.8m/s2)
    4.9 m/s2
    9.8 m/s2
    2.54 m/s2
    1.51 m/s2
  • 22. Problem
    20
    If current flowing in a conductor changes by 1%, then power will change by
    10%
    1%
    100%
    2%
  • 23. Problem
    21
    Coefficient of performance of an ideal refrigerator working between temperatures T1 and T2 (T1>T2) is
    a.
    b.
    c.
    d.
  • 24. Problem
    22
    If an electron jumps from 1st orbit to 3rd orbit, then
    No gain of energy
    Absorb energy
    No loss of energy
    Release energy
  • 25. Problem
    23
    The unit of R in the general gas equation is
    a.
    b.
    c.
    d.
  • 26. Problem
    24
    in a coil of self-inductance % henry, the rate of change of current is 2 ampere per second e.m.f induced in the coil is
    10 V
    -10 V
    5 V
    -5 V
  • 27. Problem
    25
    Myopia is due to
    Shortening of eye ball
    Older age
    Elongation of eye ball
    Change in focal length
  • 28. Problem
    26
    If the new velocity of a body is twice its previous velocity, then kinetic energy will become
    4 times
    2 times
    6 times
    0.5 times
  • 29. Problem
    27
    The laplace correction was necessary to newton’s calculation of velocity of sound, because travel of sound in a medium is
    Isobaric process
    Isothermal process
    Isochoric process
    Adiabatic process
  • 30. Problem
    28
    An electric lamp is connected to 220 V, 50Hz supply. The peak voltage is
    311 V
    210 V
    320 V
    211 V
  • 31. Problem
    29
    The discoverer of loudness and intensity of sound is
    Laplace
    Newton
    Edison
    Bell
  • 32. Problem
    31
    Which of the following is not a unit of time?
    Micro-second
    Hour
    Light year
    Niño-second
  • 33. Problem
    32
    The time period of a simple pendulum in a satellite is
    Zero
    Unity
    Same as an earth
    Infinity
  • 34. Problem
    32
    Which of the following is the smallest unit?
    Fermi
    Millimeter
    Metre
    Angstrom
  • 35. Problem
    33
    The phenomenon of production of e.m.f in a current carrying metallic strip on applying a magnetic field along a direction perpendicular to the direction of flow of current is known as
    Seeback effect
    Hall effect
    Peltier effect
    Joule effect
  • 36. Problem
    34
    Resonance is a special case of
    Damped vibration
    Forced vibration
    Un-damed vibration
    Natural vibration
  • 37. Problem
    35
    If magnetic material, which moves from stronger to weaker parts of a magnetic field, then it is known as
    Diamagnetic
    Paramagnetic
    Ferromagnetic
    Anti-ferromagnetic
  • 38. Problem
    36
    What is the magnitude of magnetic force per unit length of a wire carrying a current of 5 A and making an angle of 300 with direction of a uniform magnetic field of 0.1 T?
    0.25 N-m
    0.35 N-m
    0.45 N-m
    0.55 N-m
  • 39. Problem
    37
    Lightning was discovered by
    Ohm
    Faraday
    Thomson
    Franklin
  • 40. Problem
    38
    A string attached with a bob of mass m oscillates from A to C and back to A such that PB is H. if the acceleration due to gravity is g, then the velocity of the bob as it passes through B is
    mgH
    Zero
    √2gH
    2gH
  • 41. Problem
    39
    Thermal conductivity depends on
    Difference in temperature
    Nature of material
    Atmospheric temperature
    Heat produced
  • 42. Problem
    40
    Half-life of radioactive material depends on
    Material’s amount
    Temperature
    Disintegration medium
    Nature of material
  • 43. Problem
    41
    The evaporation of a liquid from its surface is based on
    Thomson’s law
    Joule’s law
    Bernoulli’s law
    Stefan’s law
  • 44. Problem
    42
    In an equilateral triangular prism, the angle of minimum deviation for a certain wavelength is 400. The corresponding angle of incidence is
    300
    400
    450
    500
  • 45. Problem
    43
    If vector A and B has angle Ѳ between them, then vector product is
    AB
    AB cosѲ
    A x B xcos Ѳ
    AB sin Ѳ
  • 46. Problem
    44
    Which of the following cannot be resultant of 5 and 10?
    5
    8
    2
    7
  • 47. Problem
    45
    What is the mass of a silver atom? (Avogadro’s no.=6.022*1023 mol-1 and atomic mass of silver = 108)
    120.12 x 10-31 kg
    17.93 x -26 kg
    17.93 x 10-33 kg
    16.81 x 10-29 kg
  • 48. Problem
    46
    92U235 and 92U238 differ as
    92U238 has 3 neutrons more
    92U235 has 2 protons less
    92U235 has 3 protons less
    None of these
  • 49. Problem
    47
    A rocket is based on ht principle of
    Conservation of linear momentum
    Conservation of angular momentum
    Both (a) and ( b)
    None of these
  • 50. Problem
    48
    The radius of gyration of a disc of mass 50g and radius 2.5 cm about an axis passing through its centre of gravity and perpendicular to the plane is
    0.52 cm
    1.76 cm
    3.54 cm
    6.54 cm
  • 51. Problem
    49
    The minimum number of non-collinear vectors required to produce a zero vector is
    2
    1
    4
    3
  • 52. Problem
    50
    The dimension of angular velocity is
    [M0L0T-1]
    [M0LT-2]
    [ML1T-1]
    [M0LT-1]
  • 53. For solution visit www.vasista.net