56. A P-type germanium semiconductor is doped with :
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.
59. Which one is categorized as P-type impurity ?
60. Which one is categorized as N-type impurity ?
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