The Photodiode, Solar Cell, and Zener Diode; Zener Diode as a Voltage Regulator NEET Questions

Physics - Electronic Devices

The Photodiode, Solar Cell, and Zener Diode; Zener Diode as a Voltage Regulator MCQ Questions


1.
A photodiode is a special type of p-n junction diode used to:
A.
Generate AC voltage
B.
Amplify signals
C.
Emit light when forward biased
D.
Detect light by generating photocurrent in reverse bias
😑 View Answer Rough Work Error
ANSWER :
D. Detect light by generating photocurrent in reverse bias
2.
A photodiode is operated under:
A.
Forward bias
B.
Zero bias
C.
Reverse bias
D.
Both forward and reverse bias equally
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ANSWER :
C. Reverse bias
3.
In a photodiode, light incident on the junction must have photon energy:
A.
Equal to zero
B.
Equal to thermal energy kT
C.
Greater than or equal to the band gap (hν ≥ Eg)
D.
Less than band gap
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ANSWER :
C. Greater than or equal to the band gap (hν ≥ Eg)
4.
In a reverse-biased photodiode, when light falls on it, the reverse current:
A.
Becomes negative
B.
Remains constant
C.
Increases due to photogenerated carriers
D.
Decreases to zero
😑 View Answer Rough Work Error
ANSWER :
C. Increases due to photogenerated carriers
5.
The photocurrent in a photodiode is proportional to:
A.
Square of light intensity
B.
Inverse of light intensity
C.
Frequency of light only
D.
Intensity of incident light
😑 View Answer Rough Work Error
ANSWER :
D. Intensity of incident light
6.
Why is a photodiode operated in reverse bias rather than forward bias?
A.
Fractional change in reverse current due to light is much larger than fractional change in forward current
B.
Forward bias damages the device
C.
Reverse bias gives more brightness
D.
Forward bias does not allow light entry
😑 View Answer Rough Work Error
ANSWER :
A. Fractional change in reverse current due to light is much larger than fractional change in forward current