In an experiment to find out the diameter of wire using scr…

Physics Units and Measurements Errors in Measurement Single Correct MCQ

Published on: September 13, 2026

In an experiment to find out the diameter of wire using screw gauge, the following observation were

Screw moves 0.5 mm on main scale in one complete rotation 2.92 mm

Total divisions on circular scale = 50 2.54 mm

Main scale reading is 2.5 mm 2.98 mm

45 th division of circular scale is in the pitch line (E) Instrument has 0.03 mm negative error Then the diameter of wire is : 3.45 mm

Text Solution

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The correct answer is:

MSR = 25 mm

CSR =45x mm = 0 45

Diameter reading = MSR + CSR - zero error

= 2.5 + 0.45 - (-0.03)

= 2.98 mm

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