The pitch and the number of circular scale divisions of a screw gauge are 0.5 mm and 100. Tightened with no object, the zero of the circular scale lies 3 divisions below the mean line. For a thin sheet the main scale and circular scale read 5.5 mm and 48. The thickness of the sheet is

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(3) 5.725 mm. L.C. =(0.5)/(100)=0.005 mm. Zero 3 divisions below = positive error +0.015 mm. Observed =5.5+48×0.005=5.74 mm. Corrected =5.74-0.015=5.725 mm.

The pitch and the number of circular scale divisions of a screw gauge are 0.5 mm and 100. Tightened with no object, the zero of the circular scale lies 3 divisions below the mean line. For a thin sheet the main scale and circular scale read 5.5 mm and 48. The thickness of the sheet is

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Why the other options are wrong