Assertion :Young's modulus for a perfectly plastic body is zero. Reason: For a perfectly plastic body, restoring force is zero.

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

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

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The 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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(a) Both assertion and reason are correct and the reason is correct explanation of assertion
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(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

Assertion

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Reason

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