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The least count of a vernier is the

  • A.sum of one main and one vernier division
  • B.length of the whole vernier plate
  • C.number of divisions marked on the vernier
  • D.difference between one main and one vernier division

Answer: D

Correct answer: difference between one main and one vernier division

The least count is the amount by which one main scale division exceeds one vernier division, and it is the smallest quantity the instrument can resolve. Making the vernier divisions slightly shorter than the main ones means that only one pair of lines coincides at a time, and which pair it is gives the fraction directly.

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