Question

What happens when the stress applied to the body is increased beyond the maximum value and is removed after some time?

(a) The body will come back to its original position

(b) The body will oppose the stress

(c) The body becomes hot

(d) The body cannot return to its original position

I have been asked this question at a job interview.

This is a very interesting question from Elasticity topic in chapter Thermal Properties of Matter of Engineering Physics I

Answer 1

Right answer is (d) The body cannot return to its original position

To explain: When the applied stress exceeds the maximum value the body does not regain its original position completely after removing external forces. It is said to have reached its elastic limit.