Q.1
When the temperature of an extrinsic semiconductor is increased, the pronounced effect is on
Q.2
Addition of pentavalent impurity to a semiconductor creates many
Q.3
Addition of trivalent impurity to a semiconductor creates many
Q.4
A semiconductor has ___________ temperature coefficient of resistance.
Q.5
At room temperature, an intrinsic semiconductor has ___________
Q.6
At absolute temperature, an intrinsic semiconductor has ___________
Q.7
In an intrinsic semiconductor, the number of free electrons
Q.8
An n-type semiconductor is
  • Positively charged
  • Negatively charged
  • Electrically neutral
  • None of the above
Q.9
A reverse bias pn junction has ___________
  • Very narrow depletion layer
  • Almost no current
  • Very low resistance
  • Large current flow
Q.10
A reverse bias pn junction has ___________
  • Very narrow depletion layer
  • Almost no current
  • Very low resistance
  • Large current flow
Q.11
When a pure semiconductor is heated, its resistance ___________
  • Goes up
  • Goes down
  • Remains the same
  • Can?t say
Q.12
The leakage current across a pn junction is due to ___________
  • Minority carriers
  • Majority carriers
  • Junction capacitance
  • None of the above
Q.13
The random motion of holes and free electrons due to thermal agitation is called ___________
  • Diffusion
  • Pressure
  • Ionisation
  • None of the above
Q.14
A trivalent impurity has valence electrons
  • 4
  • 5
  • 6
  • 3
Q.15
In the depletion region of a pn junction, there is a shortage of
  • Acceptor ions
  • Holes and electrons
  • Donor ions
  • None of the above
Q.16
As the doping to a pure semiconductor increases, the bulk resistance of the semiconductor ___________
  • Remains the same
  • Increases
  • Decreases
  • None of the above
Q.17
In a semiconductor, current conduction is due to
  • Only holes
  • Only free electrons
  • Holes and free electrons
  • None of the above
Q.18
When the temperature of an extrinsic semiconductor is increased, the pronounced effect is on
  • Junction capacitance
  • Minority carriers
  • Majority carriers
  • None of the above
Q.19
The leakage current in a pn junction is of the order of
  • Aa
  • mA
  • kA
  • µA
Q.20
A semiconductor is formed by bonds.
  • Covalent
  • Electrovalent
  • Co-ordinate
  • None of the above
0 h : 0 m : 1 s