Semiconductors NEET Questions

Physics - Electronic Devices

Semiconductors MCQ Questions


1.
In a vacuum tube, the electrons flow from cathode to anode because:
A.
Cathode is heated and emits electrons that move only one way
B.
Vacuum repels electrons towards anode
C.
Anode emits the electrons
D.
Electrons can flow in both directions equally
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ANSWER :
A. Cathode is heated and emits electrons that move only one way
2.
The resistivity range of semiconductors is approximately:
A.
10^11 to 10^19 Ω m
B.
10^-5 to 10^6 Ω m
C.
10^2 to 10^8 Ω m
D.
10^-2 to 10^-8 Ω m
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ANSWER :
B. 10^-5 to 10^6 Ω m
3.
Which of the following is an elemental semiconductor?
A.
CdS
B.
GaAs
C.
Germanium
D.
InP
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ANSWER :
C. Germanium
4.
In an intrinsic semiconductor at T = 0 K, the conduction band is:
A.
Completely empty
B.
Overlapping with valence band
C.
Partially filled
D.
Completely filled
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ANSWER :
A. Completely empty
5.
Holes in a semiconductor are:
A.
Negatively charged free particles
B.
Ions present in the lattice
C.
Vacancies created by missing electrons in covalent bonds, behaving as positive charge carriers
D.
Free protons in the crystal
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ANSWER :
C. Vacancies created by missing electrons in covalent bonds, behaving as positive charge carriers
6.
In an intrinsic semiconductor, the relationship between number of electrons (ne) and holes (nh) is:
A.
ne × nh = 0
B.
ne > nh
C.
ne = nh = ni
D.
ne < nh
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ANSWER :
C. ne = nh = ni