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A student measured the length of a rod a...

A student measured the length of a rod and wrote it as `3.50cm`. Which insturment did he use to measure it?

A

A meter scale

B

Avernier scale matches with 9 division in main scale and main scale has 10 divisions in 1cm

C

A screw gausge having 100 divisions the circular scale and pitch as 1mm

D

A screw gausge having 50divisions the circular scale and pitch as 1mm

Text Solution

Verified by Experts

If student measure `3.50cm` it means that there in an uncertainly of order `0.01cm`
`L.C` of `V.C = 1MSD - 1VSD`
`=(1)/(10) [1 - (9)/(10)] = (1)/(100) cm`
So `B` is correct option .
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