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Two metal strips that constitute a thermostat must necessarily differ in their _______________

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Two metal strips that constitute a thermostat must necessarily differ in their _______________

(a) Mass

(b) Length

(c) Resistivity

(d) Coefficient of linear expansion

I got this question during an interview.

Enquiry is from Thermodynamic Preliminaries in division Material Balance of Bioprocess Engineering

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Best answer
The correct choice is (d) Coefficient of linear expansion

To explain: Thermostat is used in electric apparatus like a 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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