JEE PHYSICS MCQ: SEMI CONDUCTOR DEVICES

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A piece of copper and another of germanium are cooled from room temperature to 77 K, the resistance of

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Correct option: C

Copper decreases and germanium increases

Option B is correct because both the assertion and the reason are true, but the reason is not the correct explanation of the assertion. Vibrational degrees of freedom become significant at high temperatures, and diatomic gases do have vibrational degrees of freedom.

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A PN-junction has a thickness of the order of In a

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transistor the base is the

N

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P

-region is A solid reflects incident light and its electrical conductivity decreases with temperature. The binding in this solid is An alternating current can be converted into direct current by a A N–P–N transistor is used in inverse active mode of operation then its emitter base junction should be in In the case of constants

\mathrm{\alpha\; and\; \beta }

of a transistor