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A vernier scale reads a fraction of the smallest main scale division by using

  • A.a diagonal drawn across parallel lines
  • B.a semicircular arc divided into degrees
  • C.divisions slightly smaller than those of the main scale
  • D.divisions of exactly the same size as the main scale

Answer: C

Ten vernier divisions occupying nine main divisions means each differs by a tenth of a main division, and the coincident line gives the reading. The same principle serves on a calliper, a theodolite and a drawing scale.

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