Question

Which of the following is a dimensionless quantity?

• A. specific heat
• B. strain
• C. quantity of heat
• D. stress.

Answer 1

Answer: (B)

Strain $=\frac{\text{ Extension in length }}{\text{ Original length }}=\frac{[L]}{[L]}=\left[L^0\right]$
Therefore strain is a dimensionless quantity