Question

Young's modulus of a perfect rigid body is

• A. Zero
• B. Unity
• C. Infinity
• D. Between zero and unity

Answer 1

The Correct Option is C

Young's modulus is a measure of the stiffness of a material and is defined as the ratio of stress to strain. For a perfectly rigid body, there is no deformation under applied stress, implying that the strain is zero. Since Young's modulus is the ratio of stress to strain, for a perfectly rigid body, it would be infinite, as the strain approaches zero.

So, the correct answer is (C): Infinity