Question

A rectangular plate has length (2 ± 0.02) cm and width (1 ± 0.01) cm. The maximum percentage error in the measurement of its area is –

• A. 1%
• B. 2%
• C. 3%
• D. 5%

Answer 1

Answer: (B)

2%

Answer 2

A = lb

$\frac{\Delta A}{A}$ × 100 = $\frac{\Delta\mathcal{l}}{\mathcal{l}}$ × 100 + $\frac{\Delta b}{b}$ × 100