56. A P-type germanium semiconductor is doped with :
(a) Gallium
(b) Gold
(c) Silver
(d) Silicon
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
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
59. Which one is categorized as P-type impurity ?
(a) Arsenic
(b) Boron
(c) Bismuth
(d) Antimony
60. Which one is categorized as N-type impurity ?
(a) Bismuth
(b) Indium
(c) Gallium
(d) Boron
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