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

Options

A. `P` and `Q` are conductor of different materials
B. `P` is `N`-type semiconductor and `Q` is `P`-type semiconductor
C. `P` is conductor and `Q` is conductor
D. `P` is conductor and `Q` is semiconductor

Answer

D

Explanation

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