Semiconductors NEET Questions

Physics - Electronic Devices

Semiconductors MCQ Questions


13.
Which material has a direct band gap and is commonly used in LEDs?
A.
Silicon
B.
Germanium
C.
Gallium Arsenide
D.
Copper
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ANSWER :
C. Gallium Arsenide
14.
The forward voltage drop of a silicon diode is approximately:
A.
0.3V
B.
0.7V
C.
1.2V
D.
2.0V
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ANSWER :
B. 0.7V
15.
Which process is responsible for current flow in a semiconductor diode under forward bias?
A.
Electron-hole recombination
B.
Electron drift
C.
Thermal excitation
D.
Photon emission
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ANSWER :
A. Electron-hole recombination
16.
The Hall effect is used to determine:
A.
Doping concentration
B.
Charge carrier type
C.
Resistance
D.
Electron mobility
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ANSWER :
B. Charge carrier type
17.
In an intrinsic semiconductor, the number of electrons is:

NEET - 2018

A.
Less than holes
B.
Equal to holes
C.
Greater than holes
D.
Zero
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ANSWER :
B. Equal to holes
18.
Which type of semiconductor device is used as an amplifier?
A.
Diode
B.
Transistor
C.
Capacitor
D.
Resistor
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ANSWER :
B. Transistor