Question

Which of the following is most accurate measurement ?

• A. $20\times {10}^{-3}m$
• B. $200\times {10}^{-4}m$
• C. $2\times {10}^{-2}m$
• D. $0.02m$

Answer 1

The correct option is B $200\times {10}^{-4}m$

$\begin{array}{c}\text{Most accurate measurement will be the}\\ \text{option with the most number of significant figures.}\\ \text{So our answer will be option B i.e.}200\times {10}^{-4}m\text{.}\end{array}$