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Question 1
Positive Marks: 4 / Negative Marks: 1
  • 1)

    Electron of mass m with de – Broglie wavelength λ fall on the target in an X – ray tube. The cutoff wavelength (λ0) of the emitted X – ray is

  • 2)

    In the given figure, a = 15 m/s2 represents the total acceleration of a particle moving in the clockwise direction in a circle of radius R = 2.5 m at a given instant of time. The speed of the particle is

     

    1. 6.2 m/s

    2. 4.5 m/s

    3. 5.0 m/s

    4. 5.7 m/s

  • 3)

    A satellite of mass m is orbiting the earth (or radius R) at a height h from its surface. The total energy of the satellite in term of g0. The value of acceleration due to gravity at the earth’s surface, is

  • 4)

    The second overtone of an open organ pipe has the same frequency as the first overtone of a closed pipe L meter long. The length of the open pipe will be

    1. 4 L

    2. L

    3. 2 L

  • 5)

    Which of the following combination should be selected for better tunning of an L – C – R circuit used for communication?

    1. R = 25 Ω, L = 1.5 H, C = 45 μF

    2. R = 20 Ω, L = 1.5 H, C = 35 μF

    3. R = 25 Ω, L = 2.5 H, C = 45 μF

    4. R =15 Ω, L = 3.5 H, C = 30 μF

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