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Q. Assertion A solid shaft is found to be stronger, than a hollow shaft of same material.
Reason The torque required to produce a given twist in solid cylinder is smaller than that required to twist a hollow cylinder of the same size and material.

Mechanical Properties of Solids

Solution:

A hollow shaft is found to be stronger than solid shaft of the given size and material. Hence, Assertion is false. Torque required to produce a given twist in hollow cylinder is greater than that required to twist a solid cylinder. Hence, Reason is true.