Question

Name one material whose resistivity decreases with rise in temperature?

Answer 1

Hey friend,

Generally, very little or no change is seen in resistance with rise in temperature

But, there is a decrease in resistance of a substance with rise in temperature.
Example :-
1. carbon filament 

2. ionic compounds (resistance decreases on fusion and they start conducting electricity)

3. resistance of vulcanized rubber drops by 25% when heated from 0 to 24 degrees