Semiconductor Materials – 58

58. With respect to semiconductor, identify the valid statement.
I : Drift and diffusion occur simultaneously in a semiconductor device.
II : Mobility of free electrons is same as that of holes.
III : A crystal is not electrically neutral.
IV : Semiconductors exhibit negative temperature coefficient.

(a) I
(b) II
(c) III
(d) IV

Answer : (a)

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