Statement-1: Young's modulus for a perfectly plastic body is zero
Statement-2: For a perfectly plastic body, restoring force is zero.

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If the assertion and reason both are false.

Answer

A

Explanation

Young’s modulus of a material, `Y= ("Stress")/("Strain")`
Here, stress `= ("Restoring force")/(Area")`
As restoring force is zero `therefore Y= 0`