Q. Platinum and silicon are heated upto $250℃$ and after that cooled. In the process of cooling
A) Resistance of platinum will increase and that of silicon will decrease
B) Resistance of silicon will increase and that of platinum will decrease
C) Resistance of both will increase
D) Resistance of both will decrease
Explanation
(b) The temperature coefficient of resistance of silicon ($ie$, semiconductor) is negative and that of platinum ($ie$, conductor) is positive.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.