Question

The pitch of a screw gauge is I 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 circular scale
coincides with the reference line. The length of
the wire is 5.6 cm. Find the curved surface area
(in cm) of the wire in proper significant figures. (((
solve this question with full explanation and be careful while dking this question))
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Answer 1

Answer:

Least count = \frac{1mm}{100}=.01mm

Diameter = M. S. +( No. of division coinciding with main scale × Least count.)

= 1 mm + 47 × 0.01 mm

= 1.47 mm = 0.147 cm.

Curved surface area = πdL = \frac{22}{7} *1.47*5.6 = 2.6 cm^{2}

Explanation:

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