The mean length of an object is 5 cm. Which of the following measurements is most accurate?

Options

A. `4.9 cm`
B. `4.805 cm`
C. `5.25 cm`
D. `5.4 cm`

Answer

A

Explanation

Given length `l= 5 cm`
Now , chacking the error with each option one by one we get
`Delta l_(1) = 5 - 4.9 = 0.1cm`
`Delta l_(2) = 5 - 4.805 = 0.195 cm`
`Delta l_(3) = 5.25 - 5 = 0.25 cm`
`Delta l_(4) = 5.4 - 5 = 0.4 cm`
Error `Delta l_(1)` is least,
Hence `4.9 cm` is most precise