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Units and Measurement question

2021 · Q136
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Units and Measurement question

2021 · Q136

NEETPhysicsUnits and MeasurementMCQ+4 / −1
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 :
  1. A
    0.052 cm
  2. B
    0.52 cm
  3. C
    0.026 cm
  4. D
    0.26 cm
View written solutionFree

Correct answer: A

L.C. = PitchCSD{{Pitch} \over {CSD}}CSDPitch​

=1mm100 = {{1mm} \over {100}}=1001mm​ = 0.01 m = 0.001 cm

Radius = M.S. + CSR(L.C)

= 0 + 52 (0.001)

= 0.052 cm

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