NEET UG PHYSICS MCQ: CURRENT ELECTRICITY

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A piece of copper and the other of germanium are cooled from the room temperature to

80 \mathrm{~K}

, then which of the following would be wrong statements?
(a) Resistance of each increases
(b) Resistance of each decreases
(c) Resistance of copper increases while that of germanium decreases
(d) Resistance of copper decreases while that of germanium increases

View answer and explanation

Correct option: A

(a), (b) and (c)

Option A ((a), (b) and (c)) is correct because the resistance of copper decreases with decreasing temperature, while the resistance of germanium increases with decreasing temperature. Therefore, (a), (b), and (c) are wrong statements.

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\mathrm{is}\,\,\mathrm{/}\,\,\mathrm{are}