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Q.

A screw gauge has least count of 0.01mm and zero error of -0.04mm. When diameter of a steel ball is measured with that screw gauge , main scale reading is 5mm and circular scale division coincides with 25 divisions with reference line. Correct diameter of steel ball is

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a

5.29mm

b

5.25mm

c

5.21mm

d

0.53mm

answer is D.

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Detailed Solution

Correct Diameter=M.S.R + Head scale
Coincidence div x L.C + correction
=5mm+25(0.01)mm + 0.04mm
=5.29mm

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