A screw gauge gives the following readings when used to measure the… | NEET 2021

Q42NEET 2021Medium

Least Count, Vernier Callipers & Screw Gauge

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 100 divisions on the circular scale. The diameter of the wire from the above data is:

Show answer and solution

Answer: (a)

Least count $= \dfrac{\text{pitch}}{N} = \dfrac{1\text{ mm}}{100} = 0.01\text{ mm}$
Reading $= \text{MSR} + \text{CSR}\times \text{LC} = 0 + 52\times 0.01 = 0.52\text{ mm}$
So the answer is (a) $0.052\text{ cm}$ .

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