Published by:
CGP EDU Academic Team
Published on: August 14, 2026
A screw gauge has a pitch of 1 mm and 100 divisions on the circular scale. When the jaws are closed without anything in between, the 
division of the circular scale coincide with the reference line. When measuring the diameter of a wire, the main scale reads 2 mm, and the 
division on the circular scale coincides with the reference line. What is the correct diameter of the wire?
Text Solution
Verified by ExpertsThe correct answer is:
A
Zero Error 
Coinciding division × LC)
The Observed Reading ( 
) is given by
Corrected Diameter
= Observed Reading - Zero Error
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