JEE PHYSICS MCQ: SEMI CONDUCTOR DEVICES

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Understanding +4 | -1

Platinum and silicon are heated upto

{250^ \circ }C

and after that cooled. In the process of cooling

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Correct option: B

Resistance of silicon will increase and that of platinum will decrease

Option B (Resistance of silicon will increase and that of platinum will decrease) is correct because silicon has a negative temperature coefficient and platinum has a positive temperature coefficient.

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

PNP

transistor the base is the

N

-region. Its width relative to the

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