A) An insulator at \[0K\] is zero
B) A semiconductor at \[0K\] is zero
C) A metal at \[0K\] is finite
D) A P-N diode at \[300K\] is finite, if it is reverse biased
Correct Answer: B
Solution :
At 0 K, a semiconductor becomes a perfect insulator. Therefore at 0 K, if some potential difference is applied across an insulator or a semiconductor, current is zero. But a conductor will become a superconductor at 0 K. Therefore, current will be infinite. In reverse biasing at 300 K through a P-N junction diode, a small finite current flows due to minority charge carriers.
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