AP EAMCET Engineering 22 Sep 2020 Shift 2 Paper

In perfectly rigid body, there is no change in its dimensions on applying a deforming force, therefore strain in the perfectly rigid body is zero ∴ Young's modulus
=‌

‌ Stress ‌

‌ Strain ‌

=‌

‌ Stress ‌

0

=∞
Therefore, Young's modulus of a perfectly rigid body is infinite.