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Physics Test 57...

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  • Question 1
    4 / -1

    The electrical conductivity of a semiconductor increases when electromagnetic radiation of wavelength shorter than 2480 nm is incident on it. The band gap (in eV) for the semiconductor is

  • Question 2
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    The primary of a transformer has 400 turns, while the secondary has 2000 turns. If the power output from the secondary at 1000V is 12kW, then what is the primary voltage?

  • Question 3
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    A smooth sphere "A" is moving on a frictionless horizontal surface with angular speed ω and centre of mass velocity v. It collides elastically and head-on with an identical sphere B at rest. Neglect friction everywhere. After the collision, their angular speeds are ωA and ωB, respectively. Then,

  • Question 4
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    A block of mass M is resting on an inclined plane as shown in the figure. The inclination of the plane to the horizontal is gradually increased. It is found that when the angle of inclination is θ, the block just begins to slide down the plane. What is the minimum force F applied parallel to the plane that would just make the block move up the plane?

  • Question 5
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    An equilateral triangular prism is made of glass (μ=1.5). A ray of light is incident normally on one of its faces. The angle between the incident and emergent rays is

  • Question 6
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    An a-particle of energy 5MeV is scattered through 180 by a fixed uranium nucleus. The distance of the closest approach is of the order of

  • Question 7
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    A body of mass m is dropped from a certain height. It has a velocity v when it is at a height h above the ground. Which of the following will remain constant during the free fall?

  • Question 8
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    When the plane surface of a plano-convex lens of refractive index 1.5 is silvered, it behaves like a concave mirror of focal length 30cm. When its convex surface is silvered, it will behave like a concave mirror of focal length

  • Question 9
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    A vessel contains a mixture of one mole of oxygen and two moles of nitrogen at 300 K. The ratio of the rotational kinetic energy per O2 molecule to that per N2 molecule is

  • Question 10
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    Two particles X and Y, having equal charges, after being accelerated through the same potential difference, enter a region of uniform magnetic field and describe circular paths of radii R1 and R2, respectively. The ratio of mass of X to that of Y is

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