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Physics Mcqs

In n-p-n transistor, p works as______________?

  • (A)  collector
  • (B)  emitter
  • (C)  base
  • (D)  any of above
Submitted By :Ali Uppal


p-n junction when reversed biased acts as a_______________?

  • (A)  capacitor
  • (B)  inductor
  • (C)  on switch
  • (D)  off switch
Submitted By :Ali Uppal


Semi-conductor germanium and silicon are_________________?

  • (A)  pentavalent
  • (B)  trivalent
  • (C)  divalent
  • (D)  tetravalent
Submitted By :Ali Uppal


Electrons present in p-type material due to thermal pair generation are_____________?

  • (A)  majority carriers
  • (B)  minority carriers
  • (C)  dual carriers
  • (D)  blockers
Submitted By :Ali Uppal


The velocity of laser light is___________________?

  • (A)  Less than ordinary light
  • (B)  More than ordinary light
  • (C)  Equal to ordinary light
  • (D)  Different for different colours or frequency
Submitted By :Ali Uppal


Reflecting mirrors in laser is used to______________?

  • (A)  Further stimulation
  • (B)  Lasing more
  • (C)  For producing more energetic lasers
  • (D)  All
Submitted By :Ali Uppal


The value of resistivity for insulator is of the order of____________?

  • (A)  105 ohm metre
  • (B)  106 ohm metre
  • (C)  107 ohm metre
  • (D)  108 ohm metre
Submitted By :Ali Uppal


Which one of following band is completely filled in case of conductors ?

  • (A)  Conduction band
  • (B)  Fermi band
  • (C)  Valence band
  • (D)  Forbidden band
Submitted By :Ali Uppal


Depletion region of a junction is formed_____________?

  • (A)  during the manufacturing process
  • (B)  under forward bias
  • (C)  under reverse bias
  • (D)  when temperature varies
Submitted By :Ali Uppal


In p-n-p transistor the collector current is________________?

  • (A)  equal to emitter current
  • (B)  slightly less than emitter current
  • (C)  greater than emitter current
  • (D)  any of above
Submitted By :Ali Uppal