Electronic Devices Question 45

Question: Wires P and Q have the same resistance at ordinary (room) temperature. When heated, resistance of $ P $ increases and that of Q decreases. We conclude that

[MP PMT 1995; MP PET 2001]

Options:

A) P and Q are conductors of different materials

B) P is N-type semiconductor and Q is P-type semiconductor

C) P is semiconductor and Q is conductor

D) P is conductor and Q is semiconductor

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Answer:

Correct Answer: D

Solution:

Conductor has positive temperature coefficient of resistance but semiconductor has negative temperature coefficient of resistance.



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