Question

Platinum and silicon are heated up to $250^{\circ }C$ and after that cooled. In this 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 decrease
• D. resistance of both will increase

Answer 1

Answer: (B)

On cooling the resistance of platinum (metal) will decrease and that of silicon (semiconductor) will increase.