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

Question

Assertion Young's modulus for a perfectly plastic body is zero. Reason For a perfectly plastic body, restoring force is zero. (A) If both Assertion and Reason are true and the Reason is correct explanation of the Assertion (B) If both Assertion and Reason are true but Reason is not correct explanation of the Assertion (C) If Assertion is true but Reason is false (D) If Assertion is false but the Reason is true

Tardigrade Admin · Accepted Answer

Young's modulus of a material, Y=( text strain / text strain ) and Stress =( text Restaring force / text Area ) As, restoring force is zero ∴ Y=0

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

If both Assertion and Reason are true and the Reason is correct explanation of the Assertion

If both Assertion and Reason are true but Reason is not correct explanation of the Assertion

If Assertion is true but Reason is false

If Assertion is false but the Reason is true

Young's modulus of a material, $Y = \frac{strain}{strain}$
and Stress $= \frac{Restaring force}{Area}$
As, restoring force is zero $∴ Y = 0$

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