JEE PYQ: Experimental Physics Question 13
Question 13 - 2020 (06 Sep 2020 Shift 1)
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 rotation of the circular scale, a displacement of 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:
(1) Negative, $2\ \mu$m
(2) Positive, $10\ \mu$m
(3) Positive, $0.1$ mm
(4) Positive, $0.1\ \mu$m
Show Answer
Answer: (2)
Solution
Pitch $= 0.5$ mm. Least count $= \frac{0.5}{50} = 0.01$ mm $= 10\ \mu$m. Nature of zero error is positive.
BETA
