Question

The pitch of a screw gauge is 1mm and there are 100 divisions on the circular scale.while measuring the diameter of a wire,the linear scale reads 1mm and 47th division on the circular scale coincides with the reference line

Answer 1

I think you want to ask diameter of wire
It will be 1mm + 47/100 mm = 1.47mm  
Provided there is no zero error in the screw gauge