MCQ
Two metal strips that constitute a thermostat must necessarily differ in their
- AMass
- BLength
- CResistivity
- ✓Coefficient of linear expansion
✓
Answer
Correct option: D.
Coefficient of linear expansion
(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 of linear expansion should be different.
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