Physics · 2020
JEE Main · 6 September 2020, Shift 1 · Q20
A screw gauge has 50 divisions on its circular scale. The circular scale is 4 units ahead of the pitch scale marking, prior to use. Upon one complete…
A screw gauge has $\displaystyle 50$ divisions on its circular scale. The circular scale is $\displaystyle 4$ units ahead of the pitch scale marking, prior to use. Upon one complete rotation of the circular scale, a displacement of $\displaystyle 0.5$ mm is noticed on the pitch scale. The nature of zero error involved, and the least count of the screw gauge, are respectively :
Official answer
(1)
Positive, $\displaystyle 10 \mu \mathrm{~m}$
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