Q. The solids which have the negative temperature coefficient of resistance are :
A) insulators only
B) semiconductors only
C) insulators and semiconductors
D) metals
Explanation
[Solution] Both insulators and semiconductors show decreasing resistance with rising temperature (negative coefficient). The official NTA answer is (3); the source key gives (2). Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.