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Physics Mcqs

Submitted By :Ali Uppal


When X-rays are passed through successive aluminum sheets what happens to their thickness ?

  • (A)  increases
  • (B)  it decreases
  • (C)  it remains same
  • (D)  sometimes increases and sometimes decreases
Submitted By :Ali Uppal


X-rays are similar in nature to_______________?

  • (A)  Cathode rays
  • (B)  Positive rays
  • (C)  γ-rays
  • (D)  Beta rays
Submitted By :Ali Uppal


In an electronic transition atom cannot emit______________?

  • (A)  γ-rays
  • (B)  Infra red radiation
  • (C)  Visible light
  • (D)  Ultraviolet rays
Submitted By :Ali Uppal


Radiation with wavelength longer than red lights______________?

  • (A)  ultraviolet rays
  • (B)  X-rays
  • (C)  infra red radiation
  • (D)  visible radiation
Submitted By :Ali Uppal


Reverse process of photoelectric effect is_______________?

  • (A)  pair production
  • (B)  Compton effect
  • (C)  annihilation of matter
  • (D)  X-rays production
Submitted By :Ali Uppal


In He-Ne laser the lasing action is produced by_______________?

  • (A)  Ne only
  • (B)  He-Ne both
  • (C)  Electrons of He
  • (D)  Electrons Ne
Submitted By :Ali Uppal


The metastable state for an atom in laser light is_____________?

  • (A)  10-4 sec
  • (B)  10-5 sec
  • (C)  10-3 sec
  • (D)  10-8 sec
Submitted By :Ali Uppal


In laser production the state in which more atoms are in the upper state than in the lower one is called_____________?

  • (A)  Metal stable state
  • (B)  Normal state
  • (C)  Inverted population
  • (D)  All the above
Submitted By :Ali Uppal


In normal state of energy the incident high energy photons will be______________?

  • (A)  Stimulated
  • (B)  Absorbed
  • (C)  Cause X-ray emission
  • (D)  Cause laser production
Submitted By :Ali Uppal