Solid State Physics II - SS3 Physics Past Questions and Answers - page 1
1
Which of the following statements is true about energy bands in a solid?
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A
The valence band is completely filled with electrons
B
The conduction band is completely filled with electrons
C
The energy gap between valence and conduction bands is fixed and independent of the material
D
A semiconductor has a larger energy gap than an insulator
2
Which of the following statements is true about the energy bands in a semiconductor?
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A
The valence band is empty
B
The conduction band is partially filled
C
The energy gap between the valence and conduction bands is very small
D
Semiconductors are metallic in nature
3
In which of the following materials is the energy gap between the valence and conduction bands the largest?
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A
Metals
B
Semiconductors
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C
Insulators
D
Superconductors
4
Which of the following statements is true about doping in semiconductors?
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A
N-type doping involves adding impurities that create holes in the valence band
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B
P-type doping involves adding impurities that create free electrons in the conduction band
C
Doping is used to increase the conductivity of semiconductors
D
Both N-type and P-type doping increase the conductivity of semiconductors
5
Which of the following statements is true about the Fermi level in a solid?
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A
It represents the energy at which the density of states is highest
B
It is always located in the conduction band
C
It determines the maximum energy of an electron in a solid
D
It is a measure of the average energy of the electrons in a solid
8
Which of the following materials is an example of a good conductor?
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A
Silicon
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B
Glass
C
Copper
D
Diamond
9
Which of the following materials is an example of a semiconductor?
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A
Gold
B
Aluminum
C
Silicon
D
Glass
10
What is the energy gap between the valence and conduction bands in an insulator?
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A
Zero
B
Small
C
Intermediate
D
Large
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