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Semiconductor Theory
Quiz 1
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Q.1
The most commonly used semiconductor is ___________
Germanium
Silicon
Carbon
Sulphur
Q.2
An n-type semiconductor is
Positively charged
Negatively charged
Electrically neutral
None of the above
Q.3
A trivalent impurity has valence electrons
4
5
6
3
Q.4
The random motion of holes and free electrons due to thermal agitation is called ___________
Diffusion
Pressure
Ionisation
None of the above
Q.5
In a semiconductor, current conduction is due to
Only holes
Only free electrons
Holes and free electrons
None of the above
Q.6
As the doping to a pure semiconductor increases, the bulk resistance of the semiconductor ___________
Remains the same
Increases
Decreases
None of the above
Q.7
The leakage current across a pn junction is due to ___________
Minority carriers
Majority carriers
Junction capacitance
None of the above
Q.8
When a pure semiconductor is heated, its resistance ___________
Goes up
Goes down
Remains the same
Can?t say
Q.9
When a pentavalent impurity is added to a pure semiconductor, it becomes
An insulator
An intrinsic semiconductor
p-type semiconductor
n-type semiconductor
Q.10
The barrier voltage at a pn junction for germanium is about
5.0 V
3.0 V
Zero
0.3 V
Q.11
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.12
A reverse bias pn junction has ___________
Very narrow depletion layer
Almost no current
Very low resistance
Large current flow
Q.13
A hole in a semiconductor is defined as ___________
A free electron
The incomplete part of an electron pair bond
A free proton
A free neutron
Q.14
With forward bias to a pn junction , the width of depletion layer
Decreases
Increases
Remains the same
None of the above
Q.15
At room temperature, an intrinsic silicon crystal acts approximately as
A battery
A conductor
An insulator
A piece of copper wire
Q.16
A pn junction acts as a ___________
Controlled switch
Bidirectional switch
Unidirectional switch
None of the above
Q.17
A forward biased pn junction diode has a resistance of the order of
Ω
kΩ
MΩ
None of the above
Q.18
A reverse biased pn junction has resistance of the order of
Ω
kΩ
MΩ
None of the above
Q.19
A semiconductor is formed by bonds.
Covalent
Electrovalent
Co-ordinate
None of the above
Q.20
The leakage current in a pn junction is of the order of
Aa
mA
kA
µA
0 h : 0 m : 1 s
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