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Physics Test 22...

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  • Question 1
    4 / -1

    An X-ray tube produces a continuous spectrum of radiation with its shortest wavelength of 45 × 10−2 Å. The maximum energy of a photon in the radiation in eV is (h =6.62 × 10−34J s, c = 3 × 108 m s−1)

  • Question 2
    4 / -1

    On heating water, bubbles being formed at the bottom of the vessel detach and rise. Take the bubbles to be spheres of radius R and making a circular contact of radius r with the bottom of the vessel. If r < < R, and the surface tension of water is T, value of r just before bubbles detach is

    (density of water is pw)

  • Question 3
    4 / -1

    An air-tight cage with a parrot sitting in it is suspended from the spring balance. The parrot starts flying. The reading of the spring balance will

  • Question 4
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    A rod AD, consisting of three segments AB, BC and CD joined together, is hanging vertically from a fixed support at A. The lengths of the segments are respectively 0.1 m, 0.2 m and 0.15 m. The cross - section of the rod is uniform 10-4 m2. A weight of 10 kg is hung from D. Calculate the displacements of point D if YAB = 2.5 x 1010 N/m2, YBC = 4 x 1010 N/m2 and YCD = 1 x 1010 N/m2. (Neglect the weight of the rod.)

  • Question 5
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    Variation of resistance of the conductor with temperature is as shown. Temperature coefficient of the conductor is

  • Question 6
    4 / -1

    Two point charges exert on each other a force F when they are placed r distance apart in air. When they are placed R distance apart in medium of dielectric constant K, they exert the same force. The distance R equals

  • Question 7
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    In an adiabatic process, the pressure is increased by 2/3% and Cp/Cv = 3/2 for the gas. Then the volume decreases by about:

  • Question 8
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    A body is projected up a smooth inclined plane with velocity v from the point A as shown in the figure. The angle of inclination is 45° and the top is connected to a well of diameter 40 m. If the body just manages to cross the well, what is the value of v? Length of the inclined plane is 20√2 m.

  • Question 9
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    The current i in a coil varies with time as shown in the figure. The variation of induced emf with time would be

  • Question 10
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    The radii of two planets are R1 and R2 and their densities are ρ1 and ρ2 respectively. If g1 and g2 represent the acceleration due to gravity at their respective surfaces, then g1/g2 is

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