Question

29. The pitch of a screw guage is 1 mm and there are 100 divisions on the circular scale. While measuring the
diameter of a wire, the linear scale reads 1 mm and 47th division on the circular scale coincides with the
reference line. The length of the wire is 5.6 cm. Find the curved surface area (in cm²) of the wire in
appropriate number of significant figures.​

Answer 1

Explanation:

L.C of screw = Pitch/Number of division

= 0.01 mm

Coinciding division = 47th

Circular Scale Reading = n * L.C

= 0.47 mm

Total Reading = Linear Scale Reading + Circular Scale Reading

= 1.47 mm

Diameter of wire = 1.47 mm

Radius = 0.735mm

Length of wire = 56mm

Curved surface area of wire = 2πrh

= 2*22/7*0.735*56

= 258.72cm²

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Answer 2

Explanation:

258.72

$258.72{cm}^{2}$