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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 only

Solution

A liquid cannot resist shear stress, which means it has zero shear modulus, making statement I true. The other statements are not universally true.

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