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Physics Test - ...

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  • Question 1
    4 / -1

    If a person travels from the equator to the poles, he finds that the value of acceleration due to gravity (g) ____

  • Question 2
    4 / -1

    At temperature T = 300 K, an n-type silicon contains donor concentration, ND = 1014 cm–3 and intrinsic carrier concentration ղi = 1.5 × 10–10 cm–3. Assume minority carrier lifetime of holes is τpo = 10 μsec. Then lifetime of majority carrier electron is _____.

  • Question 3
    4 / -1

    A bullet of mass 20 g has an initial speed of 1 ms−1, just before it starts penetrating a mud wall of thickness 20 cm. If the wall offers a mean resistance of 2.5 × 10−2 N, the speed of the bullet after emerging from the other side of the wall is close to:

  • Question 4
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    A tube of length L is filled completely with an incompressible liquid of mass M and closed at both the ends. The tube is then rotated in horizontal plane about one of its ends with a uniform angular velocity ω. The force exerted by the liquid at the other end is:

  • Question 5
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    Ratio of rms velocities of O2 and H2 at equal temperature will be?

  • Question 6
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    The electromagnetic waves travel with a velocity:

  • Question 7
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    Light can travel in vacuum and sound waves cannot because ________.

  • Question 8
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    An npn bipolar junction transistor (BJT) is operating in the active region. If the reverse bias across the base – collector junction is increased, then:

  • Question 9
    4 / -1

    A magnet of dipole moment 2Am2 is deflected through 30∘ from magnetic meridian. The required deflecting torque is

  • Question 10
    4 / -1

    The electromagnetic waves can be produced by:

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