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JEE Main20202 Sep 2020Morning ShiftPhysicsExperimental PhysicsActual

The least count of the main scale of a vernier calipers is 1 mm . Its vernier scale is divided into 10 divisions and coincide with 9 divisions of the main scale. When jaws are touching each other, the 7 th division of the vernier scale coincides with a division of the main scale and the zero of vernier scale is lying right side of the zero of the main scale. When this vernier is used to measure the length of the cyli

Options

  1. A3 . 2 cm
  2. B3 . 21 cm
  3. C3 . 07 cm
  4. D2 . 99 cm

Correct answer

C. 3 . 07 cm

Step-by-step solution

Zero Error = 0 + 7 × 0 . 1 = 0 . 070 Vernier reading =   ( 3 . 1 + 4 × 0 . 01 )   – 0 . 07 = 3 . 07

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