Which of the following measurement is most precise?
1. \(5.00~\text{mm}\)
2. \(5.00~\text{cm}\)
3. \(5.00~\text{m}\)
4. \(5.00~\text{km}\)
Hint: The precision of a measured quantity depends on the measuring instrument's least count.
Step: Find the most precise quantity.
All given measurements are correct up to two decimal places. As here \(5.00~\text{mm}\) has the smallest unit and the error in \(5.00~\text{mm}\) is least (commonly taken as \(0.01~\text{mm}\) if not specified). Therefore, \(5.00~\text{mm}\) is most precise.
Hence, option (1) is the correct answer.
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