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Semiconductor Materials – 1 – 5

21. Doping is a process of :

(a) Purifying semiconductor material
(b) Increasing impurity percentage
(c) Removal of foreign atoms
(d) Increasing the bias potential

ANSWER

EXPLANATION

22. For a doped semiconductor material, the dynamic resistance is :

(a) Small and can be neglected
(b) Large and can be neglected
(c) Small but cannot be neglected
(d) Large but cannot be neglected

ANSWER

EXPLANATION

23. ……….. is an example of acceptor material.

(a) Gallium
(b) Arsenide
(c) Bismuth
(d) Antimony

ANSWER

EXPLANATION

24. When a semiconductor is heavily doped in a range of 1017 to 1018 impurity atoms/cm3, then it behaves as :

(a) Intrinsic semiconductor
(b) Extrinsic semiconductor
(c) Simply as semiconductor
(d) Degenerative semiconductor

ANSWER

EXPLANATION

25. Graphite is a :

(a) Conductor
(b) Insulator
(c) Semiconductor
(d) None of these

ANSWER

EXPLANATION

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