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(D) Copper is a metal. For metals,the resistance decreases as the temperature decreases. Therefore,when copper is cooled,its resistance decreases.Germ

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copper decreases and germanium increases

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(D) Copper is a metal. For metals,the resistance decreases as the temperature decreases. Therefore,when copper is cooled,its resistance decreases.Germanium is a semiconductor. Semiconductors have a negative temperature coefficient of resistance,meaning their resistance increases as the temperature decreases. Therefore,when germanium is cooled,its resistance increases.Thus,the resistance of copper decreases and that of germanium increases.

Column-$I$	Column-$II$
$a$. Bicuspid valve	$p$. Brain
$b$. Nephron	$q$. Liver
$c$. Alveoli	$r$. Heart
$d$. Cerebrum	$s$. Kidney
	$t$. Lungs

$A$ piece of copper and another of germanium are cooled from room temperature to $80\, K$. The resistance of :

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$a$. Bicuspid valve $p$. Brain

$b$. Nephron $q$. Liver

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$d$. Cerebrum $s$. Kidney

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