Semiconductors NEET Questions

Physics - Electronic Devices

Semiconductors MCQ Questions


13.
During the formation of p-n junction, which two processes occur?
A.
Ionization and recombination
B.
Emission and absorption
C.
Conduction and convection
D.
Diffusion and drift
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ANSWER :
D. Diffusion and drift
14.
In an unbiased p-n junction, holes diffuse from p-region to n-region because:
A.
Free electrons in n-region attract them
B.
They are pushed by the potential difference
C.
Of thermal vibrations only
D.
Hole concentration in p-region is more than in n-region
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ANSWER :
D. Hole concentration in p-region is more than in n-region
15.
When a forward bias is applied to a p-n junction, the potential barrier:
A.
Remains the same
B.
Decreases
C.
Increases
D.
Becomes infinite
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ANSWER :
B. Decreases
16.
In reverse bias condition of a p-n junction:
A.
Width of depletion layer increases
B.
Forward current is high
C.
Width of depletion layer decreases
D.
Barrier potential decreases
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ANSWER :
A. Width of depletion layer increases
17.
The threshold (cut-in) voltage of a silicon diode is approximately:
A.
1.1 V
B.
5 V
C.
0.7 V
D.
0.2 V
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ANSWER :
C. 0.7 V
18.
The reverse saturation current in a p-n junction diode is due to:
A.
Both majority and minority carriers equally
B.
Majority carriers
C.
Minority carriers
D.
Drift of majority carriers
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ANSWER :
C. Minority carriers