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Main scale of a screw gauge is 3mm and 4...

Main scale of a screw gauge is 3mm and 42 division of circular scale of 100 divisions coincides with reference line then find the diameter of the cylinder

A

1.42 cm

B

2.42 cm

C

1.21 m

D

3.42 mm

Text Solution

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The correct Answer is:
4
`2r =3 nm +42 xx0.01 =3.42`
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