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

  • 1. 
    For germanium crystal, the forbidden energy gap in joules

  • 1.216 × 10-19
  • 1.76 × 10-19
  • 1.6 × 10-19
  • zero

  • 2. 
    To obtain electrons as majority charge carriers in a semiconductors the impurity mixed is:

  • monovalent
  • divalent
  • trivalent
  • pentavalent

  • 3. 
    In the middle of the depletion layer of a reverse biased p-n junction, the:

  • electric field is zero
  • potential is maximum
  • electric field is maximum
  • potential zero.

  • 4. 
    In a common base amplifier the phase difference between the input signal voltage and output voltage is :

  • π/2
  • 0
  • π/4
  • π

  • 5. 
    Energy bands in solids are a consequence of:

  • Ohm's Law
  • Pauli's exclusion principle
  • Bohr's theory
  • Heisenberg's uncertainty principle

  • 6. 
    In semi conductor which are responsible for conduction:

  • only electron
  • electron and hole both
  • only hole
  • None of these

  • 7. 
    In binary system III represents:

  • 1
  • 3
  • 7
  • 100

  • 8. 
    On heating, resistance of semiconductors:

  • decreases
  • increases
  • remains same
  • first increases then decreases

  • 9. 
    p-n junction diode can be used as:

  • amplifier
  • oscillator
  • detector
  • modulator

  • 10. 
    In intrinsic semiconductor at room temperature, the number of electrons and holes are:

  • equal
  • unequal
  • infinite
  • zero
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