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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

5.29mm

b

5.28mm 

c

5.32m

d

5.26mm

answer is B.

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Detailed Solution

LC= 0.5 50 =0.01mm 

Zero error is 3 division
 Zero error =0.03mm  
Reading =5.0+29×0.01  
d=5.29−0.03=5.26    

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