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Units and Measurements
Measurement of Length – Screw Gauge
2 questions from 2 papers, each with its answer.
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All Questions
2021 1 question
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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:Least count $= \frac{1\ mm}{100} = 0.01$ mm Diameter = main scale reading + circular scale reading × LC $= 0 + 52 \times 0.01 = 0.52$ mm $= 0.052$ cm
2020 1 question
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A screw gauge has least count of 0.01 mm and there are 50 divisions in its circular scale. The pitch of the screw gauge is:Least count $= \frac{pitch}{number\ of\ divisions\ on\ circular\ scale}$ $0.01\ mm = \frac{pitch}{50}$ Pitch = 0.5 mm