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


7.
Which component is required to smooth the rectified output voltage?
A.
Capacitor
B.
Inductor
C.
Resistor
D.
Transistor
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ANSWER :
A. Capacitor
8.
The light emitted by an LED is due to:
A.
Photon emission
B.
Electron absorption
C.
Electron scattering
D.
Thermal agitation
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ANSWER :
A. Photon emission
9.
The I-V characteristics of an LED differ from a normal diode because:
A.
It has a higher threshold voltage
B.
It operates at a lower voltage
C.
It emits light at lower currents
D.
It requires a reverse bias
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ANSWER :
A. It has a higher threshold voltage
10.
In forward bias, a p-n junction diode has:

NEET - 2015

A.
Very high resistance
B.
Very low resistance
C.
Zero resistance
D.
Infinite resistance
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ANSWER :
B. Very low resistance
11.
The knee voltage of a silicon diode is approximately:
A.
0.3V
B.
0.7V
C.
1.1V
D.
2.0V
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ANSWER :
B. 0.7V
12.
In a forward-biased diode, the current varies:
A.
Exponentially with voltage
B.
Linearly with voltage
C.
Independently of voltage
D.
Remains constant
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ANSWER :
A. Exponentially with voltage