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Q.

Diagrams show readings of a screw gauge. 
Figure (i) shows the zero error reading when the screw gauge is closed, figure (ii) the reading when the screw gauge is being used to measure the diameter of a ball-bearing. What is the diameter of the ball-bearing? There are 50 divisions on circular scale.

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a

5.29 mm

b

5.26 mm

c

5.28 mm

d

5.32 mm

answer is B.

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Detailed Solution

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Zero error is 3 division LC=0.550=0.01mm
zero error = 0.03 mm
Reading = 5.0 + 29  0.01
d = 5.29-0.03 = 5.26 mm
 

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