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JEE Main202310 Apr 2023Evening ShiftPhysicsExperimental PhysicsActual

In an experiment with vernier callipers of least count 0 . 1 mm , when two jaws are joined together the zero of vernier scale lies right to the zero of the main scale and 6 th division of vernier scale coincides with the main scale division. While measuring the diameter of a spherical bob, the zero of vernier scale lies in between 3 . 2 cm and 3 . 3 cm marks and 4 th division of vernier scale coincides with the main

Options

  1. A3 . 22   cm
  2. B3 . 18   cm
  3. C3 . 26   cm
  4. D3 . 25   cm

Correct answer

B. 3 . 18   cm

Step-by-step solution

The least count is L C = 0 . 1   mm Zero error ( Z E ) = 6 × L C = 6 × 0 . 1   mm = 0 . 6   mm The total reading is T R = M S R + V S R × L C - Z E ⇒ T R = 32   mm + ( 0 . 1 × 4 )   mm - 0 . 6   mm ⇒ T R = 31 . 8   mm = 3 . 18   cm

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