The solids which have the negative temperature coefficient of resistance are :

1. metals

2. insulators only

3. semiconductors only

4. insulators and semiconductors

Doubtly Asked 30 Oct 2026 NEET UG 2020 Practice test neet Save WhatsApp Report

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Answer: 4. insulators and semiconductors

Metals have a positive temperature coefficient of resistance: resistance rises with temperature as collisions increase.

In semiconductors and insulators, heating frees more charge carriers, so resistance falls. Their coefficient is therefore negative.

Hence option 4.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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