Semiconductor Theory MCQ Questions & Answers

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In a semiconductor, current conduction is due to

A) Only holes B) Only free electrons C) Holes and free electrons D) None of the above

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Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

As the doping to a pure semiconductor increases, the bulk resistance of the semiconductor ___________

A) Remains the same B) Increases C) Decreases D) None of the above

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Answer & Solution

Answer: Option C

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When a pentavalent impurity is added to a pure semiconductor, it becomes

A) An insulator B) An intrinsic semiconductor C) p-type semiconductor D) n-type semiconductor

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Answer & Solution

Answer: Option D

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The barrier voltage at a pn junction for germanium is about

A) 5.0 V B) 3.0 V C) Zero D) 0.3 V

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Answer & Solution

Answer: Option D

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In the depletion region of a pn junction, there is a shortage of

A) Acceptor ions B) Holes and electrons C) Donor ions D) None of the above

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Answer & Solution

Answer: Option B

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A trivalent impurity has valence electrons

A) 4 B) 5 C) 6 D) 3

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Answer & Solution

Answer: Option D

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The random motion of holes and free electrons due to thermal agitation is called ___________

A) Diffusion B) Pressure C) Ionisation D) None of the above

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Answer & Solution

Answer: Option A

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The leakage current across a pn junction is due to ___________

A) Minority carriers B) Majority carriers C) Junction capacitance D) None of the above

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Answer & Solution

Answer: Option A

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When a pure semiconductor is heated, its resistance ___________

A) Goes up B) Goes down C) Remains the same D) Can?t say

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Answer & Solution

Answer: Option B

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A reverse bias pn junction has ___________

A) Very narrow depletion layer B) Almost no current C) Very low resistance D) Large current flow

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Answer & Solution

Answer: Option B

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Semiconductor Theory MCQ Questions & Answers | Electrical Engineering