Semiconductors NEET Questions

Physics - Electronic Devices

Semiconductors MCQ Questions


7.
The energy gap (Eg) of carbon (diamond), silicon, and germanium follows the order:
A.
(Eg)C = (Eg)Si = (Eg)Ge
B.
(Eg)C < (Eg)Si < (Eg)Ge
C.
(Eg)Si > (Eg)C > (Eg)Ge
D.
(Eg)C > (Eg)Si > (Eg)Ge
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ANSWER :
D. (Eg)C > (Eg)Si > (Eg)Ge
8.
In an n-type semiconductor, the dopants are:
A.
Trivalent atoms like B, Al, In
B.
Pentavalent atoms like As, Sb, P
C.
Tetravalent atoms like C, Si
D.
Divalent atoms like Mg, Ca
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ANSWER :
B. Pentavalent atoms like As, Sb, P
9.
In a p-type semiconductor, the majority carriers are:
A.
Holes
B.
Electrons
C.
Ions
D.
Protons
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ANSWER :
A. Holes
10.
The relation nenh = ni² holds true for:
A.
Only n-type semiconductors
B.
Only intrinsic semiconductors
C.
Only p-type semiconductors
D.
Both intrinsic and extrinsic semiconductors in thermal equilibrium
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ANSWER :
D. Both intrinsic and extrinsic semiconductors in thermal equilibrium
11.
In an n-type silicon, which statement is true?
A.
Electrons are majority carriers and trivalent atoms are dopants
B.
Electrons are minority carriers and pentavalent atoms are dopants
C.
Holes are minority carriers and pentavalent atoms are dopants
D.
Holes are majority carriers and trivalent atoms are dopants
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ANSWER :
C. Holes are minority carriers and pentavalent atoms are dopants
12.
The depletion region in a p-n junction consists of:
A.
Equal numbers of free electrons and holes
B.
Only free electrons
C.
Only free holes
D.
Immobile ionized donor and acceptor atoms with no free charge carriers
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ANSWER :
D. Immobile ionized donor and acceptor atoms with no free charge carriers