Consider a Vernier callipers in which each 1 cm on the main…

Maths JEE - Advanced Previous Year Paper JEE-Advanced-2015-Paper-1 Single Correct MCQ

Published on: August 13, 2026

Consider a Vernier callipers in which each 1 cm on the main scale is divided into 8 equal divisions and a screw gauge with 100 divisions on its circular scale. In the Vernier callipers, 5 divisions of the Vernier scale coincide with 4 divisions on the main scale and in the screw gauge, one complete rotation of the circular scale moves it by two divisions on the linear scale. Then:

If the pitch of the screw gauge is twice the least count of the Vernier callipers, the least count of the screw gauge is 0.01 mm.

If the pitch of the screw gauge is twice the least count of the Vernier callipers, the least count of the screw gauge is 0.005 mm.

If the least count of the linear scale of the screw gauge is twice the least count of the Vernier callipers, the least count of the screw gauge is 0.01 mm.

If the least count of the linear scale of the screw gauge is twice the least count of the Vernier callipers, the least count of the screw gauge is 0.005 mm.

Text Solution

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The correct answer is:

CHECK THE SOLUTION.

(b,c)For vernier callipers,

1 main scale division = cm

1 vernier scale division = cm

So least count = cm

For screw gauge,

pitch (p) = 2 main scale division

So least count

So option & are correct.

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