Electronic Devices Question 34

Question: A piece of copper and the other of germanium are cooled from the room temperature to 80 K, then which of the following would be a correct statement

[IIT-JEE 1988; Bihar CEE 1992; CBSE PMT 1993; MP PET 1997; RPET 1999; AIEEE 2004]

Options:

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

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Answer:

Correct Answer: D

Solution:

Resistance of conductors (Cu) decreases with decrease in temperature while that of semi-conductors (Ge) increases with decrease in temperature.



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