Q.

The given diagram represents a screw gauge. The circular scale is divided into 50 divisions and the linear scale is divided into millimeters. If the screw advances by 1 mm when the circular scale makes 2 complete revolutions, the reading of the instrument in the figure is ____mm

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answer is 0003.32.

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Detailed Solution

Pitch of the screw =1 mm2=0.5 mm​ Least count =0.550=0.01 mm​ ∴Reading = Linear scale reading + (coinciding circular scale × least count) ​                    =3.0 +32×0.01​                    =3.0+0.32​                        =3.32 mm​
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