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Physics Mcqs

Electron cannot exist in the nucleus it is confirmed by observing that______________?

  • (A)  It does emit radiation
  • (B)  Its size as compare to proton and neutron is very small
  • (C)  No antiparticle of electron is present
  • (D)  The velocity of electron must be very high according to uncertainty principle
Submitted By :Ali Uppal


Wave-like characteristic of electron is demonstrated by______________?

  • (A)  Line spectrum of atoms
  • (B)  Production of x-rays.
  • (C)  Diffraction by crystalline solids
  • (D)  Photoelectric effect
Submitted By :Ali Uppal


UV radiation can be produced by______________?

  • (A)  Heating the filament
  • (B)  Electron excitation in the gas
  • (C)  Ionization of atoms
  • (D)  All the above
Submitted By :Ali Uppal


X-rays are diffracted by a crystal but not by a diffraction grating because_____________?

  • (A)  The ions in a crystal are well arranged
  • (B)  The lines in a diffraction grating cannot reflect X-rays.
  • (C)  The penetration power of X-rays is high in a diffraction grating
  • (D)  The wavelengths of X-rays are of the same order of magnitude as the separation between atoms in a crystal
Submitted By :Ali Uppal


Maximum frequency in the spectrum from X-ray tube is directly proportional to the______________?

  • (A)  Number of incident electron i.e. filament current
  • (B)  The kinetic energy of the incident electron i.e. the potential difference through which they are accelerated
  • (C)  The soft target which can easily emit electrons
  • (D)  All of above are correct
Submitted By :Ali Uppal


Submitted By :Ali Uppal


Thermions are________________?

  • (A)  protons
  • (B)  positrons
  • (C)  electrons
  • (D)  photons
Submitted By :Ali Uppal


Which one of the following has the greatest energy gap ?

  • (A)  insulator
  • (B)  conductor
  • (C)  semi conductor
  • (D)  any of above
Submitted By :Ali Uppal


Submitted By :Ali Uppal


Identify the correct statement about minority carriers_____________?

  • (A)  holes in n-type and free electrons in p-type
  • (B)  holes in n-type and p-type
  • (C)  free electrons in n-type and holes in p-type
  • (D)  free electrons in n-type and p-type
Submitted By :Ali Uppal