Wire 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

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The resistance of conductors (like P) increases with temperature due to increased thermal vibrations hindering electron flow. The resistance of semiconductors (like Q) decreases with temperature as more charge carriers become available. Insulators have very high resistance, which generally decreases slightly with temperature but not as significantly as semiconductors.

The final answer is $D$

Physics - Semiconductors Question with Solution | TestHub

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