Strength of Materials

Q1: When a bar is cooled to - 5°C, it will develop

A compressive stress

B no stress

C tensile stress

D shear stress

ANS:C - tensile stress

If the bar is cooled, it will shrink. But the internal forces will resist that by producing force in opposite direction to shrinkage which means the internal forces produce tension. So the answer is tensile stress if the bar is fixed.

But here the bar is not under any restraints. So there will be no stress.

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