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What effect do thermal variations in volume have on a body?

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What effect do thermal variations in volume have on a body?

(a) Expansion

(b) Contraction

(c) Cracking

(d) Phase transformation

The question was asked in an interview for internship.

This is a very interesting question from Thermal Properties in portion Properties of Engineering Materials of Engineering Material & Metallurgy

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The correct choice is (c) Cracking

To explain: Cracking is the effect of thermal variation in the volume of a body. Expansion, contraction, and phase transformation are the ways in which these volume changes occur, i.e. they are causes, and not effects.

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