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  4. Two wires P and Q made up of different materials have same resistance at room temperature, when heated, resistance of P increases and that of Q decreases. We conclude that

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Q. Two wires $P$ and $Q$ made up of different materials have same resistance at room temperature, when heated, resistance of $P$ increases and that of $Q$ decreases. We conclude that

Chhattisgarh PMTChhattisgarh PMT 2004

Solution:

Resistance of conductors increases with rise in temperature while decreases in case of semiconductors.
So, clearly $P$ is conductor whereas $Q$ is semiconductor.