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Semiconductor Materials – 2 – 2

56. A P-type germanium semiconductor is doped with :

(a) Gallium
(b) Gold
(c) Silver
(d) Silicon

ANSWER

EXPLANATION

57. Consider the statements.
Statement I : The temperature coefficient of resistance of a semiconductor is negative while that of a metal is positive.
Statement II : A semiconductor behaves as an insulator at 0°K while it has some conductivity at room temperature.
Which of the following is/are correct ?

(a) Statement I
(b) Statement II
(c) Both statements I & II
(d) Either statement I or II

ANSWER

EXPLANATION

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

EXPLANATION

59. Which one is categorized as P-type impurity ?

(a) Arsenic
(b) Boron
(c) Bismuth
(d) Antimony

ANSWER

EXPLANATION

60. Which one is categorized as N-type impurity ?

(a) Bismuth
(b) Indium
(c) Gallium
(d) Boron

ANSWER

EXPLANATION

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