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Q.

In "Al" and "Si" , if temperature is changed from normal temperature to 70 K then

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a

The resistance of Al will increase and that of Si will decrease

b

The resistance of Al will decrease and that of Si will increase

c

Resistance of both decrease

d

Resistance of both increase

answer is B.

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Detailed Solution

A temperature decreases, resistance of metal decreases (less collision) and resistance of semiconductor increases (less electron-hole pair).
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