Semiconductor Diodes (I-V Characteristics in Forward and Reverse Bias; Diode as a Rectifier; I-V Characteristics of LED ) NEET Questions

Physics - Electronic Devices

Semiconductor Diodes (I-V Characteristics in Forward and Reverse Bias; Diode as a Rectifier; I-V Characteristics of LED ) MCQ Questions


1.
What is the typical forward voltage drop of a silicon diode?
A.
0.3V
B.
0.7V
C.
1.2V
D.
2.0V
😑 View Answer Rough Work Error
ANSWER :
B. 0.7V
2.
In reverse bias, a p-n junction diode:
A.
Allows a small leakage current
B.
Blocks current flow
C.
Conducts fully
D.
Enhances conductivity
😑 View Answer Rough Work Error
ANSWER :
B. Blocks current flow
3.
A p-n junction diode acts as a rectifier because it:

NEET - 2018

A.
Allows current flow in both directions
B.
Allows current flow only in one direction
C.
Has zero resistance in reverse bias
D.
Blocks current in forward bias
😑 View Answer Rough Work Error
ANSWER :
B. Allows current flow only in one direction
4.
What happens when the reverse voltage exceeds the breakdown voltage in a diode?
A.
Diode gets damaged
B.
Diode starts conducting
C.
Diode maintains constant voltage
D.
Diode blocks all current
😑 View Answer Rough Work Error
ANSWER :
B. Diode starts conducting
5.
In a half-wave rectifier, the output frequency is:
A.
Equal to input frequency
B.
Twice the input frequency
C.
Same as input voltage
D.
Zero
😑 View Answer Rough Work Error
ANSWER :
B. Twice the input frequency
6.
A full-wave rectifier provides output for:
A.
Only half of the AC cycle
B.
Both halves of the AC cycle
C.
One-fourth of the AC cycle
D.
Only positive cycles
😑 View Answer Rough Work Error
ANSWER :
B. Both halves of the AC cycle