Q. Two metal strips that constitute a thermostat must necessarily differ in their
A) Mass
B) Length
C) Resistivity
D) Coefficient of linear expansion
Explanation
(d) Thermostat is used in electric apparatus like refrigerator, iron $etc$ for automatic cut off. Therefore for metallic strips to bend on heating their coefficient if linear expansion should be different
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.