2024 Re-NEET Units and MeasurementsScrew gauge - least count and reading Medium Question 11 of 53 in Units and Measurements

The pitch of an error free screw gauge is 1 mm and there are 100 divisions on the circular scale. While measuring the diameter of a thick wire, the pitch scale reads 1 mm and 63rd division on the circular scale coincides with the reference line. The diameter of the wire is:

A 1.63 cm
B 0.163 cm
C 0.163 m
D 1.63 m

The answer is B.

Solution

Least count $=\dfrac{\text{Pitch}}{\text{No. of divisions}}=\dfrac{1}{100}=0.01$ mm. Reading $=$ MSR $+$ CSR $\times$ LC $=1+63\times0.01=1.63$ mm $=0.163$ cm.

Concept Screw gauge - least count and reading

Units and Measurements in past papers

53 questions from this chapter have appeared across 25 exam years.