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.
A semiconductor diode is basically a:
A.
Pure semiconductor crystal
B.
p-n junction with metallic contacts at the ends for external voltage application
C.
Two metallic plates separated by vacuum
D.
Metal-semiconductor contact only
šŸ˜‘ View Answer Rough Work Error
ANSWER :
B. p-n junction with metallic contacts at the ends for external voltage application
2.
In the symbol of a p-n junction diode, the direction of arrow indicates:
A.
Direction of reverse current
B.
Direction from n-side to p-side
C.
Direction of electron flow
D.
Conventional direction of current under forward bias
šŸ˜‘ View Answer Rough Work Error
ANSWER :
D. Conventional direction of current under forward bias
3.
When a p-n junction diode is forward biased:
A.
Both sides are connected to negative terminal
B.
Both sides are connected to positive terminal
C.
p-side is connected to negative terminal and n-side to positive terminal
D.
p-side is connected to positive terminal and n-side to negative terminal of battery
šŸ˜‘ View Answer Rough Work Error
ANSWER :
D. p-side is connected to positive terminal and n-side to negative terminal of battery
4.
Under forward bias, the effective barrier height of a p-n junction is:
A.
Vā‚€/V
B.
Vā‚€ Ɨ V
C.
(Vā‚€ + V)
D.
(Vā‚€ - V)
šŸ˜‘ View Answer Rough Work Error
ANSWER :
D. (Vā‚€ - V)
5.
The depletion layer width under forward bias:
A.
Remains the same
B.
Becomes infinite
C.
Increases
D.
Decreases
šŸ˜‘ View Answer Rough Work Error
ANSWER :
D. Decreases
6.
In a forward biased p-n junction diode, the applied voltage drops mostly across:
A.
The p-region only
B.
The n-region only
C.
The depletion region
D.
The metallic contacts
šŸ˜‘ View Answer Rough Work Error
ANSWER :
C. The depletion region