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


7.
The change in current due to light in a photodiode is more easily detected in reverse bias because:
A.
Light cannot enter in forward bias
B.
Reverse current is small, so small changes are easily measurable
C.
Forward current is unaffected by light
D.
Reverse current is large, so changes are easier
😑 View Answer Rough Work Error
ANSWER :
B. Reverse current is small, so small changes are easily measurable
8.
Photodiodes find applications in:
A.
Heating elements
B.
Power generation only
C.
Voltage regulation only
D.
Light detectors, optical communication, smoke detectors, light meters
😑 View Answer Rough Work Error
ANSWER :
D. Light detectors, optical communication, smoke detectors, light meters
9.
In a photodiode, the depletion region:
A.
Should be hidden from light
B.
Must be very thick
C.
Should be exposed to light for efficient operation
D.
Plays no role
😑 View Answer Rough Work Error
ANSWER :
C. Should be exposed to light for efficient operation
10.
The minimum frequency of light that can be detected by a photodiode with band gap Eg = 1.5 eV is approximately:
A.
3.6 × 10¹⁴ Hz
B.
1.0 × 10²⁰ Hz
C.
1.5 × 10¹⁵ Hz
D.
6.6 × 10⁻³⁴ Hz
😑 View Answer Rough Work Error
ANSWER :
A. 3.6 × 10¹⁴ Hz
11.
In a photodiode, when no light is incident:
A.
Current is in mA range
B.
Forward current flows
C.
A small dark current (reverse saturation current) still flows
D.
No current flows at all
😑 View Answer Rough Work Error
ANSWER :
C. A small dark current (reverse saturation current) still flows
12.
A photodiode differs from an LED in that:
A.
Both convert electricity to light
B.
Photodiode converts light to electricity (reverse bias); LED converts electricity to light (forward bias)
C.
Both work in same bias
D.
Photodiode emits light; LED detects light
😑 View Answer Rough Work Error
ANSWER :
B. Photodiode converts light to electricity (reverse bias); LED converts electricity to light (forward bias)