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Physics Mcqs

Which one of following postulate is in accordance with the Rutherfords model ?

  • (A)  continuous spectra for atoms
  • (B)  discrete spectra for atoms
  • (C)  either continuous nor discrete
  • (D)  no spectrum
Submitted By :Ali Uppal


When we excite some atoms by heat collision or electrical discharge they will________________?

  • (A)  radiate electromagnetic energy with a continuous distribution of wavelength
  • (B)  absorb particular wavelengths when white light is incident on them
  • (C)  radiate electromagnetic energy of discrete characteristic wavelength
  • (D)  emit either invisible or visible light
Submitted By :Ali Uppal


In obtaining an X-ray photograph of our hand we use the principle of______________?

  • (A)  photo electric effect
  • (B)  ionization
  • (C)  shadow photograph
  • (D)  any of above
Submitted By :Ali Uppal


Photon of highest frequency will be absorbed when transition takes place from_____________?

  • (A)  1st to 5th orbit
  • (B)  2nd to 5th orbit
  • (C)  3rd to 5th orbit
  • (D)  4th to 5th orbit
Submitted By :Ali Uppal


The radiations emitted form hydrogen filled discharge tube show____________?

  • (A)  band spectrum
  • (B)  line spectrum
  • (C)  continuous spectrum
  • (D)  absorption spectrum
Submitted By :Ali Uppal


Total number of series in hydrogen spectrum is_____________?

  • (A)  three
  • (B)  four
  • (C)  five
  • (D)  six
Submitted By :Ali Uppal


The characteristic X-rays spectrum is due to_____________?

  • (A)  The illumination of the target metal by ultra-violet radiation
  • (B)  The bombardment of the target by protons
  • (C)  The bombardment of target by electrons
  • (D)  The absorption of radiation by the target metal
Submitted By :Ali Uppal


The minimum wavelength of X-rays can further be reduced by _______________?

  • (A)  Reducing the pressure or cooling the target
  • (B)  Increasing the temperature of the filament.
  • (C)  Using a target element of higher atomic number
  • (D)  Increasing the potential difference between the cathode and the target
Submitted By :Ali Uppal


Radiation produced from TV picture tube is_____________?

  • (A)  B-rays
  • (B)  X-rays
  • (C)  Far infrared
  • (D)  Infrared
Submitted By :Ali Uppal


Submitted By :Ali Uppal