A screw gauge gives the following readings when used to mea…

Physics Units, Dimensions and Measurement NEET Previous Year Question MCQ (Single Correct)

A screw gauge gives the following readings when used to measure the diameter of a wire

Main scale reading: 0 mm
Circular scale reading: 52 divisions

Given that, 1 mm on main scale corresponds to divisions on the circular scale. The diameter of the wire from the above data is [NEET 2021]

0.52 cm

0.026 cm

0.26 cm

0.052 cm

Text Solution

Verified by Experts

The correct answer is:

Given, the main scale reading,

The circular scale reading,

Now, we shall determine the least count of the screw gauge,

Here, is the pitch of the screw and is the number of circular divisions in one complete revolution.

Thus, the least count of the screw gauge is 0.001 cm. Therefore, diameter of the wire of screw gauge,

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