CBSE  /  Class 12  /  Physics  /  Semiconductor Electronics: Materials, Devices and Simple Circuits

  • 1. 
    in a semiconductor :

  • trivalent
  • covalent
  • bivalent
  • monovalent

  • 2. 
    Number of electrons in the valence shell of a semiconductor is:

  • 1
  • 2
  • 3
  • 4

  • 3. 
    Semiconductors of both p-type and n-type are produced by:

  • ionic solids
  • covalent solids
  • metallic solids
  • molecular solids

  • 4. 
    With fall of temperature, the forbidden energy gap of a semiconductor

  • increases
  • decreases
  • sometimes increases and sometimes decreases
  • remains unchanged

  • 5. 
    In a p-type semiconductor, current conduction is by:

  • atoms
  • holes
  • electrons
  • protons

  • 6. 
    The relation between number of free electrons (n) in a semiconductor and temperature (T) is given by:

  • n ∝ T
  • n ∝ T²
  • n ∝ T1/2
  • n ∝ T3/2

  • 7. 
    In reverse biasing:

  • large amount of current flows
  • no current flows
  • potential barrier across junction increases
  • depletion layer resistance increases

  • 8. 
    Main function of a transistor is to :

  • rectify
  • simplify
  • amplify
  • all the above

  • 9. 
    To obtain p-type silicon semiconductor, we need to dope pure silicon with:

  • aluminium
  • phosphorus
  • oxygen
  • germanium

  • 10. 
    On applying reverse bias to a junction diode, it:

  • lowers the potential barrier
  • raise the potential barrier
  • increases the majority carrier current
  • increases the minority carrier current
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