semiconductor theory MCQs – Page 2

Practise focused semiconductor theory questions with marked answers for exam preparation and subject revision.

semiconductor theory Mcqs
21. The battery connections required to forward bias a pn junction are_________________?
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A. None of the above

B. +ve terminal to p and ve terminal to n

C. #NAME?

D. #NAME?

22. At room temperature, an intrinsic semiconductor has_______________?
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A. A few free electrons and holes

B. No holes or free electrons

C. Many free electrons only

D. Many holes only

23. A pentavalent impurity has______________Valence electrons?
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A. 4

B. 3

C. 6

D. 5
24. A forward biased pn junction diode has a resistance of the order of_____________?
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A. O

B. kO

C. None of the above

D. MO

25. A hole in a semiconductor is defined as_________________?
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A. strong>. A free proton

B. The incomplete part of an electron pair bond

C. A free electron

D. A free neutron

26. When a pure semiconductor is heated, its resistance_________________?
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A. Remains the same

B. Goes up

C. Cant say

D. Goes down
27. The strength of a semiconductor crystal comes from______________?
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A. Forces between protons

B. Electron-pair bonds

C. None of the above

D. Forces between nuclei

28. The most commonly used semiconductor is________________?
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A. Sulphur

B. Germanium

C. Silicon

D. Carbon

29. When a pentavalent impurity is added to a pure semiconductor, it becomes________________?
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A. An intrinsic semiconductor

B. An insulator

C. n-type semiconductor

D. p-type semiconductor

30. A trivalent impurity has______________valence electrons?
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A. 5

B. 6

C. 4

D. 3
31. An n-type semiconductor is______________?
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A. Electrically neutral

B. Negatively charged

C. Positively charged

D. None of the above

32. A reverse biased pn junction has resistance of the order of________________?
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A. O

B. kO

C. None of the above

D. MO
33. At room temperature, an intrinsic silicon crystal acts approximately as_______________?
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A. A conductor

B. An insulator

C. A piece of copper wire

D. A battery

34. A pn junction acts as a__________________?
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A. Unidirectional switch

B. Bidirectional switch

C. Controlled switch

D. None of the above

35. A semiconductor has generally_______________valence electrons?
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A. 3

B. 2

C. 4

D. 6