Question
Assertion

Young's modulus for a perfectly plastic body is zero.

Reason

For a perfectly plastic body, restoring force is zero.

A

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

B

Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

C

Assertion is correct but Reason is incorrect

D

Both Assertion and Reason are incorrect

Medium

Solution

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Correct option is
D

Both Assertion and Reason are incorrect

Young's modulus is only defined for the elastic part of the stress strain curve. So for a plastic body, it won't be defined.
Statement 2 is correct as plasticity means original shape is not regained, so regaining force should be zero for a perfectly plastic material.

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