Zero Error = 0+7×0.1=0.070
Vernier reading =(3.1+4×0.01)–0.07=3.07
JEE Main 2020 — Physics Mechanics
The least count of the main scale of a vernier calipers is 1mm. Its vernier scale is divided into 10 divisions and coincide with 9 divisions of the main scale. When jaws are touching each other, the 7th 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 cylinder the zero of the vernier scale between 3.1cm and 3.2cm and 4th VSD coincides with the main scale division. The length of the cylinder is (VSD is vernier scale division)
Held on 2 Sept 2020 · Verified 6 Jul 2026.
3.2cm
3.21cm
3.07cm
2.99cm
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