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