Answer:
Since the relative error in the measurement of 40.00 m is minimum, so this measurement is most accurate. The measurement 4.00 mm is most precise because it is measured with an instrument of minimum least count.
Length\[(l)\]
Least Count \[(\Delta l)\]
Relative Error
\[(\Delta l/l)\]
(i) \[~\text{4}.00\text{ mm}\]
\[0.0\text{1mm}\]
\[\text{2}.\text{5}\times \text{ 1}{{0}^{\text{-3}}}\]
(ii) \[\text{4}.00\text{ cm}\]
\[0.0\text{1 cm}\]
\[2.5\times {{10}^{-3}}\]
(iii) \[\text{4}.00\text{ m}\]
\[0.0\text{1 m}\]
\[2.5\times {{10}^{-3}}\]
(iv) \[~\text{4}0.00\text{ m}\]
\[0.01\text{m}\]
\[2.5\times {{10}^{-4}}\]
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