Physics · 2021
JEE Main · 27 July 2021, Shift 1 · Q20
Assertion A: If in five complete rotations of the circular scale, the distance travelled on main scale of the screw gauge is 5 mm and there are 50…
Assertion A: If in five complete rotations of the circular scale, the distance travelled on main scale of the screw gauge is $\displaystyle 5$ mm and there are $\displaystyle 50$ total divisions on circular scale, then least count is $\displaystyle 0.001$ cm.Reason R: Least Count $\displaystyle =\frac{\text { Pitch }}{\text { Total divisions on circular scale }}$
In the light of the above statements, choose the most appropriate answer from the options given below:
Official answer
(4)
A is not correct but $\displaystyle \mathbf{R}$ is correct.
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JEE Main 2021 Physics question, with the answer from NTA’s final answer key. Where our answers come from.