Question

A rectangular block is heated from 0°C to 100°C. The percentage increase in its length is 0.2%. The percentage increase in its volume is

• A. 0.6%
• B. 0.10%
• C. 0.2%
• D. 0.4%

Answer 1

Answer: (A)

0.6%

Answer 2

Volume $V = L^{3}$

$\therefore\frac{\Delta V}{V} \times 100 = 3\frac{\Delta L}{L} \times 100 = 3 \times 0.2\% = 0.6\%$

$\left( \because\frac{\Delta L}{L} = 0.2\% \right)$