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Q: _____ has divisions which are slightly longer than those of main scale and in which n divisions of the vernier scale are equal to (n + 1) division on the main scale.
  • A. Double vernier
  • B. Extended vernier
  • C. Direct vernier
  • D. Retrograde vernier
Correct Answer: Option D - A vernier can primarily be divided into the following two classes. • Direct vernier • Retrograde vernier Retrograde vernier – A retrograde vernier is the one which extends or increases in the opposite direction as that of the main scale and in which the smallest division of the vernier is longer than smallest division on the main scale. • It is so constructed that (n+1) division of the main scale are equal in length of a divisions of the vernier. Extended vernier– When 'n' division on the vernier scale is equal to (2n–1) division on the main scale.
D. A vernier can primarily be divided into the following two classes. • Direct vernier • Retrograde vernier Retrograde vernier – A retrograde vernier is the one which extends or increases in the opposite direction as that of the main scale and in which the smallest division of the vernier is longer than smallest division on the main scale. • It is so constructed that (n+1) division of the main scale are equal in length of a divisions of the vernier. Extended vernier– When 'n' division on the vernier scale is equal to (2n–1) division on the main scale.

Explanations:

A vernier can primarily be divided into the following two classes. • Direct vernier • Retrograde vernier Retrograde vernier – A retrograde vernier is the one which extends or increases in the opposite direction as that of the main scale and in which the smallest division of the vernier is longer than smallest division on the main scale. • It is so constructed that (n+1) division of the main scale are equal in length of a divisions of the vernier. Extended vernier– When 'n' division on the vernier scale is equal to (2n–1) division on the main scale.