Q. What is the bandgap energy in semiconductors?
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A.
The energy required to free an electron
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B.
The energy of the conduction band
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C.
The energy of the valence band
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D.
The energy lost during conduction
Solution
The bandgap energy is the energy required to free an electron from the valence band to the conduction band in semiconductors.
Correct Answer:
A
— The energy required to free an electron
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Q. What is the main advantage of using BJTs over FETs?
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A.
Higher input impedance
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B.
Higher current gain
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C.
Lower power consumption
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D.
Better thermal stability
Solution
BJTs typically offer higher current gain compared to FETs, making them suitable for certain amplification applications.
Correct Answer:
B
— Higher current gain
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Q. What is the main characteristic of a P-N junction in semiconductor physics?
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A.
It allows current to flow in both directions
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B.
It creates a depletion region
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C.
It acts as a capacitor
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D.
It has infinite resistance
Solution
A P-N junction creates a depletion region where charge carriers are absent, which is crucial for its rectifying behavior.
Correct Answer:
B
— It creates a depletion region
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Q. What type of rectifier allows current to flow in both directions but only during one half of the AC cycle?
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A.
Full-wave rectifier
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B.
Half-wave rectifier
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C.
Bridge rectifier
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D.
Zener rectifier
Solution
A half-wave rectifier allows current to flow only during one half of the AC cycle, blocking the other half.
Correct Answer:
B
— Half-wave rectifier
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Q. Which configuration of a BJT is commonly used for voltage amplification?
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A.
Common emitter
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B.
Common base
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C.
Common collector
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D.
Emitter follower
Solution
The common emitter configuration is widely used for voltage amplification due to its high gain characteristics.
Correct Answer:
A
— Common emitter
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Q. Which of the following materials is a common semiconductor?
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A.
Copper
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B.
Silicon
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C.
Aluminum
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D.
Gold
Solution
Silicon is the most widely used semiconductor material in electronic devices due to its favorable electrical properties.
Correct Answer:
B
— Silicon
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