Calculate the number of division of the main scale that is equal to the 8 divisions of the extended vernier.

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SSC JE CE Previous Year Paper 7 (Held On: 27 Jan 2018 Morning)
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  1. 7
  2. 9
  3. 15
  4. 16

Answer (Detailed Solution Below)

Option 3 : 15
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Detailed Solution

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Concept:

Vernier Scale is used to measure the fractional part of the least division marked on the main scale.

Types of Vernier Scale

  • Direct Vernier:
    • N divisions of the direct vernier = (N - 1) division of the main scale
  • Retrograde Vernier:
    • N divisions of the retrograde vernier = (N + 1) division of the main scale
  • Extended Vernier:
    • N divisions of the extended vernier = (2 N - 1) division of the main scale

 

Calculation:

N divisions of the extended vernier = (2 N - 1) division of the main scale

8 divisions of the extended vernier = (2 × 8 - 1) division of the main scale

8 divisions of the extended vernier = 15 division of the main scale

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