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Q: _____ is used when the graduations on the main scale are numbered in both directions and it extends in both the divisions.
  • A. Double folded vernier
  • B. Direct vernier
  • C. Double vernier
  • D. Extended vernier
Correct Answer: Option C - Vernier scale– The vernier is a device of measuring fractional part of the smallest divisions of the graduated scale. • If the graduations of the main scale are numbered in one direction only,it is called single vernier whereas if graduations are numbered in both the direction, it is called double vernier.
C. Vernier scale– The vernier is a device of measuring fractional part of the smallest divisions of the graduated scale. • If the graduations of the main scale are numbered in one direction only,it is called single vernier whereas if graduations are numbered in both the direction, it is called double vernier.

Explanations:

Vernier scale– The vernier is a device of measuring fractional part of the smallest divisions of the graduated scale. • If the graduations of the main scale are numbered in one direction only,it is called single vernier whereas if graduations are numbered in both the direction, it is called double vernier.