1.

In a complete rotation, spindle of a screw gauge advances by `(1)/(2)mm`. There are `50` divisions on circular scale. The main scale has `(1)/(2)mm` marks to (is graduated to `(1)/(2)mm`) If a wire is put between the jaws, `3` main scale divisions are clearly visible, and `20th` division of circular scale coincides with reference line. Find diameter of wire in correct significant figures.A. `1.7mm`B. `1.70mm`C. `3.40mm`D. `3.20mm`

Answer» Correct Answer - B
dia. of e is
`(3xx(1)/(2)mm)+(2.0)((1//2mm)/(50))`
`=1.5+0.20=1.70mm`


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