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PhysicsNEET 2021Measuring instruments: vernier, screw gauge

Units and Measurements

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

  1. A.0.52 cm
  2. B.0.026 cm
  3. C.0.26 cm
  4. D.0.052 cm✓

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