in a semiconductor :
  • trivalent
  • covalent
  • bivalent
  • monovalent
Number of electrons in the valence shell of a semiconductor is:
  • 1
  • 2
  • 3
  • 4
Semiconductors of both p-type and n-type are produced by:
  • ionic solids
  • covalent solids
  • metallic solids
  • molecular solids
With fall of temperature, the forbidden energy gap of a semiconductor
  • increases
  • decreases
  • sometimes increases and sometimes decreases
  • remains unchanged
In a p-type semiconductor, current conduction is by:
  • atoms
  • holes
  • electrons
  • protons
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
In reverse biasing:
  • large amount of current flows
  • no current flows
  • potential barrier across junction increases
  • depletion layer resistance increases
Main function of a transistor is to :
  • rectify
  • simplify
  • amplify
  • all the above
To obtain p-type silicon semiconductor, we need to dope pure silicon with:
  • aluminium
  • phosphorus
  • oxygen
  • germanium
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
For germanium crystal, the forbidden energy gap in joules
  • 1.216 × 10-19
  • 1.76 × 10-19
  • 1.6 × 10-19
  • zero
To obtain electrons as majority charge carriers in a semiconductors the impurity mixed is:
  • monovalent
  • divalent
  • trivalent
  • pentavalent
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.
In a common base amplifier the phase difference between the input signal voltage and output voltage is :
  • π/2
  • 0
  • π/4
  • π
Energy bands in solids are a consequence of:
  • Ohm's Law
  • Pauli's exclusion principle
  • Bohr's theory
  • Heisenberg's uncertainty principle
In semi conductor which are responsible for conduction:
  • only electron
  • electron and hole both
  • only hole
  • None of these
In binary system III represents:
  • 1
  • 3
  • 7
  • 100
On heating, resistance of semiconductors:
  • decreases
  • increases
  • remains same
  • first increases then decreases
p-n junction diode can be used as:
  • amplifier
  • oscillator
  • detector
  • modulator
In intrinsic semiconductor at room temperature, the number of electrons and holes are:
  • equal
  • unequal
  • infinite
  • zero
0 h : 0 m : 1 s

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