• question_answer 34) In $''Al''$ and $''Si''$. If temperature is changed from normal temperature to 70 K then A)  The resistance of $Al$ will increase and that of $Si$ will decreaseB)  The resistance of $Al$ will decrease and that of $Si$ will increaseC)  Resistance of both decreaseD)  Resistnance of both increase

Correct Answer: B

Solution :

$T\downarrow$ ($300K$ to $70K$) $T\downarrow \underset{(Al)}{\mathop{{{R}_{metal}}}}\,\downarrow \underset{(Si)}{\mathop{R}}\,\uparrow$semi - conductor

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