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


13.
Which of the following is true about the breakdown region of a diode?
A.
Current increases rapidly
B.
Voltage remains constant
C.
Voltage fluctuates
D.
Voltage drops to zero
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ANSWER :
A. Current increases rapidly
14.
In a reverse-biased p-n junction diode, the current is due to:

NEET - 2016

A.
Majority carriers
B.
Minority carriers
C.
Holes only
D.
Electrons only
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ANSWER :
B. Minority carriers
15.
Which diode is specifically designed to operate in breakdown region?
A.
Schottky diode
B.
LED
C.
Photodiode
D.
Zener diode
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ANSWER :
D. Zener diode
16.
Which factor determines the color of an LED?
A.
Doping concentration
B.
Reverse voltage
C.
Forward voltage
D.
Band gap energy
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ANSWER :
D. Band gap energy
17.
Which of the following graphs represents the I-V characteristics of a diode in forward and reverse bias?

NEET - 2017

A.
Linear curve
B.
Exponential in forward, almost zero in reverse
C.
Parabolic curve
D.
Constant current in both directions
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ANSWER :
B. Exponential in forward, almost zero in reverse
18.
In an LED, electron-hole recombination occurs in:
A.
Conduction band
B.
Vacuum space
C.
Valence band
D.
Depletion region
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ANSWER :
D. Depletion region