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Physics Test - ...

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  • Question 1
    3 / -1

    A ball balanced on a vertical rod is an example of:

  • Question 2
    3 / -1

    The constant tug on the moon as it moves around the earth is due to:

  • Question 3
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    The minority current produced in a pn junction semiconductor is dependent on:

  • Question 4
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    A transformer has an efficiency of 80%. It is connected to a power input of 4 kW and 100 V. if the secondary voltage is 240 V, then the secondary current is

  • Question 5
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    In Doppler's effect in sound,

  • Question 6
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    One mole of an ideal gasCpCv=γheated by lawp=αV where P is pressure of gas, V is volume,α is a constant. The heat capacity of gas in the process is

  • Question 7
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    A sonometer wire resonates with a given tuning fork forming stationary waves with 5 antinodes, between 2 bridges, when a mass of 9 kg is suspended from the wire. When the mass is replaced by another mass m, the wire with the same tuning fork forms three antinodes, for the same position of the bridges. The value of m is

  • Question 8
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    For a diamagnetic atom, two electrons are revolving around the nucleus in X-Z plane. A uniform magnetic field  is applied perpendicular to the plane of orbit and directed away from the reader. Then,

  • Question 9
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    The resistance of a conductor decreases with:

  • Question 10
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    A uniform rod of length L is held with one end resting on a frictionless horizontal surface making an angle α with the vertical. When the rod is released, its angular velocity at an angle θ with the vertical is given by

  • Question 11
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    What is the distance between two compressions of a sound wave produced by a source which is vibrating with frequency 100 Hz? (Given speed of sound is 340 m/s)

  • Question 12
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    Velocity of a particle moving in a curvilinear path in a horizontal XY plane varies with time asv=2ti^+t2ȷ^m/sHere, t is in second. Then at t = 1 second-

  • Question 13
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    A planet of core density 3p and outer curst of density p has small tunnel in core. A small Particle of mass m is released from end A then time required to reach end B :


  • Question 14
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    In the figure as shown, a triangular portion is cut from a circular disc of radius R. The distance of centre of mass of the remaining part from the centre of disc is


  • Question 15
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    A rod of mass M and length

    is at rest on plane horizontal smooth surface. A particle of same mass M strike one end with velocity u perpendicular to rod, elastically. Now just after collision what is the kinetic energy of upper half part of rod.


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