Question

The measured length of a rod is (20.0 $\pm$ 0.2) cm. The percentage error in the measurement is:

• A. 0.5%
• B. 1%
• C. 2%
• D. 5%

Hint:

To calculate percentage error quickly:
Shift the decimal point of both the absolute error and the measured value to make the math simpler.
Here, $\frac{0.2}{20} \times 100 = \frac{2}{200} \times 100 = \frac{2}{2} = 1\%$.
Always double check that both values have the same unit of measurement.

Answer 1

The Correct Option is B

Step 1: % error.
$(0.2/20.0)\times100$
\[ \boxed{1\%} \]