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Q: The vernier scale in which 10 divisions of the viernier scale is equal to 9 divisions of the main scale is called _____.
  • A. direct vernier
  • B. double vernier
  • C. extended vernier
  • D. retrograde vernier
Correct Answer: Option A - Direct vernier- It is so constructed that (n – 1) divisions of the main scale is equal to n division of the vernier. In direct vernier, vernier scale moves in same direction of main scale.
A. Direct vernier- It is so constructed that (n – 1) divisions of the main scale is equal to n division of the vernier. In direct vernier, vernier scale moves in same direction of main scale.

Explanations:

Direct vernier- It is so constructed that (n – 1) divisions of the main scale is equal to n division of the vernier. In direct vernier, vernier scale moves in same direction of main scale.