The main scale of a vernier calliper reads 10 mm in 10 divisions. 10 divisions of vernier scale coincide with 9 divisions of the main scale. When the two jaws of the callipers touch each other, the fi

Question

The main scale of a vernier calliper reads $10 mm$ in $10$ divisions. $10$ divisions of vernier scale coincide with $9$ divisions of the main scale. When the two jaws of the callipers touch each other, the fifth division of the vernier coincides with a main scale division and the zero of the vernier is to the right of zero of the main scale. When a cylinder is tightly placed between the two jaws, the zero of vernier scale lies slightly to the left of $3.2 cm$ and the fourth vernier division coincides with the main scale division. The diameter of the cylinder is

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Answer:

A

Solution:

Zero error $= 0.5 mm = 0.05 cm$

observed reading of cylinder $= 3.2 cm + (4) (0.01 cm) = 3.24 cm$

actual thickness of cylinder $= (3.24) - (0.05) = 3.19 cm$

TestHub · Accepted Answer

Zero error = 0 . 5 mm = 0 . 05 cm observed reading of cylinder = 3 . 2 cm + ( 4 ) ( 0 . 01 cm ) = 3 . 24 cm actual thickness of cylinder = ( 3 . 24 ) – ( 0 . 05 ) = 3 . 19 cm

Physics - Unit & Dimension Question with Solution | TestHub

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