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A screw gauge having 100 equal division ...

A screw gauge having `100` equal division and a pitch of length `1mm` is used to measue the diameter of a wire of length `5.6cm`. The main scale reading is `1mm and 47^(th)` circular division coincides with the scale. Find the curved surface area of wire in `cm^(2)` to appropriate significant fihure.
`(use pi = (22)/(7)`

Text Solution

Verified by Experts

The correct Answer is:
2.6
Least count`=(1mm)/(100)=0.01mm`
`Diameter=MSR+CSR`
`=1mm+47(0.01)mm=1.47mm`
Surface are
`piDl=(22)/(7)xx1.47xx56mm^(2)`
`=2.58724cm^(2)=2.6cm^(2)`
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