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Choose the statement(s) that are true: I. A liquid has zero shear modulus. II. The Young’s modulus of a substance falls as temperature increases. III. Poisson’s ratio has no unit.

1. I only
2. II only
3. I and II
4. I, II and III

Correct answer: I, II and III

Solution

I: a liquid cannot sustain shear, so its shear modulus is zero - true. II: Young's modulus decreases as temperature rises - true. III: Poisson's ratio is a ratio of strains, hence dimensionless - true. So I, II and III are all correct.

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