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Question

A screw gauge has positive error of 4 divisions. When the screw gauge holds a sphere the main scale reading is 4 mm and the head scale coinciding division is 24. If its least count is 0.01 mm , the volume of the sphere is _____ mm3

A
24.456
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B
38.808
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C
62.378
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D
40.567
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Solution

The correct option is B 38.808
Positive error =4×0.01=0.04 mm
Diameter of sphere d=M.S.R+n×L.C. zero error
Or d=4+24×0.010.04=4.20 mm
Volume of sphere V=4π3(d2)3
V=4π3×(4.202)3=38.808 mm3

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