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Electrical Engineering
Semiconductor Theory
Quiz 2
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Q.1
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.2
Addition of pentavalent impurity to a semiconductor creates many
Free electrons
Holes
Valence electrons
Bound electrons
Q.3
Addition of trivalent impurity to a semiconductor creates many
Holes
Free electrons
Valence electrons
Bound electrons
Q.4
A semiconductor has ___________ temperature coefficient of resistance.
Positive
Zero
Negative
None of the above
Q.5
At room temperature, an intrinsic semiconductor has ___________
Many holes only
A few free electrons and holes
Many free electrons only
No holes or free electrons
Q.6
At absolute temperature, an intrinsic semiconductor has ___________
A few free electrons
Many holes
Many free electrons
No holes or free electrons
Q.7
In an intrinsic semiconductor, the number of free electrons
Equals the number of holes
Is greater than the number of holes
Is less than the number of holes
None of the above
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
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