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Physics Mcqs

The existence of Ether wind was experimentally rejected by__________________?

  • (A)  equal to its rest mass
  • (B)  double of its rest mass
  • (C)  infinite
  • (D)  zero
Submitted By :Ali Uppal


Stopping potential for a metal surface in case of photoelectric emission depends on_____________?

  • (A)  the threshold frequency for the metal surface
  • (B)  the intensity of incident light
  • (C)  the frequency of incident light and work function of the metal surface
  • (D)  all of the above
Submitted By :Ali Uppal


The linear momentum of an X-ray photon of wavelength 0.1A is_______________?

  • (A)  6.625x1023N-s
  • (B)  66.25x1023N-s
  • (C)  662.5x1023N-s
  • (D)  data is insufficient
Submitted By :Ali Uppal


Linear momentum of a photon is_______________?

  • (A)  zero
  • (B)  hv/c2
  • (C)  hv/c
  • (D)  c2/hv
Submitted By :Ali Uppal


An observer shoots parallel to a meter stick at very high (relativistic) speed and finds that the length of meter stick is________________?

  • (A)  greater than one meter
  • (B)  less than one meter
  • (C)  one meter
  • (D)  a foolish question
Submitted By :Ali Uppal


Mark the wrong statement ?

  • (A)  a frame of reference which is either at rest or moves with a constant velocity is called an inertial frame of reference
  • (B)  an un-accelerated frame of reference is called an inertial frame of reference
  • (C)  all the frames of reference in uniform rectilinear motion are equivalent
  • (D)  Newtons laws of motion are valid in an accelerated (non inertial) frame of reference
Submitted By :Ali Uppal


0.001 kg mass will be equivalent to_________________?

  • (A)  2.50 GWh
  • (B)  25.00 GWh
  • (C)  0.26 GWh
  • (D)  250 GWh
Submitted By :Ali Uppal


Which one of the following radiations has the strongest photon?

  • (A)  T.V waves
  • (B)  Microwaves
  • (C)  X-rays
  • (D)  γ-rays
Submitted By :Ali Uppal


After traveling through a vacuum a photon of light entering into some transparent denser medium. Thus the energy of light______________?

  • (A)  Increases because wavelength decreases
  • (B)  Decreases because speed decreases
  • (C)  Remains same
  • (D)  Increases then decrease
Submitted By :Ali Uppal


Which one of the following has the largest energy content ?

  • (A)  103 photons of wavelength 2 pm (γ-rays)
  • (B)  102 photons of wavelength 1nm (x-rays)
  • (C)  106 photons of wavelength 50?m (infrared)
  • (D)  106 photons of wavelength 200nm (UV)
Submitted By :Ali Uppal