Question

A cube is subjected to a uniform volume compression. If the side of the cube decreases by 2%, the bulk strain is ___________

(a) 0.02

(b) 0.03

(c) 0.04

(d) 0.06

This question was posed to me in an international level competition.

The query is from Elastic Limit topic in portion Thermal Properties of Matter of Engineering Physics I

Answer 1

The correct answer is (d) 0.06

To explain: V=l^3

∆V/V=3∆l/l=3(2/10)=0.06.