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AFMC Physics  2000
 

AFMC Physics 2000

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AFMC Physics  2000 AFMC Physics 2000 Presentation Transcript

  • AFMC–Past papers
    PHYSICS- UNSOLVED PAPER - 2000
  • 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
  • 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.
  • 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.
  • 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.
  • Problem
    04
    A moving charge produces
    Electric field only
    Magnetic field only
    Both electric and magnetic field
    None of these
  • Problem
    05
    The density of nucleus is of order of
    103 kg/m3
    1012kg/m3
    1017 kg/m3
    1024 kg/m3
  • Problem
    06
    The energy gap between conduction band and valence band is order of 0.07 eV. It is a
    Insulator
    Conductor
    Semiconductor
    Alloy
  • 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
  • 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
  • Problem
    09
    Ratio of inertial mass to gravitational mass is
    0.5
    1
    2
    No fixed number
  • 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
  • Problem
    11
    In which medium sound travel faster?
    Steel
    Water
    Air
    Vacuum
  • Problem
    12
    The Bernoulli's theorem is based on the conservation of
    Mass
    Energy
    Momentum
    All
  • 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.
  • 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
  • Problem
    15
    Specific resistance of a wire depends upon
    Length
    Cross-section are
    Mass
    None
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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.
  • 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
  • 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.
  • Problem
    27
    A planet which is twin sister of Earth is
    Mercury
    Venus
    Mars
    Jupiter
  • Problem
    28
    Terminal velocity of a body with radius r directly proportional to
    R1
    r 2
    r -1
    r2
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • Problem
    35
    If we remove the atmosphere of earth then the duration of day will
    Increase
    Decrease
    Will remain same
    Depends upon season
  • 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
  • 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
  • Problem
    38
    The velocity of light in vacuum can be changed by changing
    Frequency
    Amplitude
    Wavelength
    None of these
  • Problem
    39
    Rainbow is formed due to
    Reflection
    Refraction
    Scattering
    Dispersion
  • 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.
  • 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
  • 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
  • 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
  • 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
  • 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°
  • 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
  • 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
  • Problem
    48
    If coefficient of cubical expansion is x-times the coefficient of superficial expansion, then x is
    2.5
    1.5
    3
    2
  • 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
  • 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
  • For solution visit www.vasista.net