A micrometer screw gauge used to measure the diameter of a wire has a sleeve (main) scale reading of 5.5 mm, and its thimble scale reads 0.12 mm at the datum line. What is the total diameter reading?

Model answer

5.62 mm

Also accepted: 5.62mm

Explanation

The total reading is the sleeve reading plus the thimble reading: 5.5 mm + 0.12 mm = 5.62 mm.

Derived from ZIMSEC Physics 4023/2 Paper 2 Theory, Specimen Paper, Q1

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