First slide

Measurement

Question

The pitch of a screw is 1mm and there are 100 divisions on the circular scale. In measuring the diameter of a sphere there are six divisions on the linear scale and forty divsions on circular scale coincide with the reference line. Find the diameter of the sphere.

Moderate

A

6.4mm
B

4.6mm
C

6mm
D

0.4mm

Solution

$L C = \frac{1}{100} = 0.01 m m T o t a l r e a d i n g = M S R + C S R (L C) = 6 (1) + (40 \times 0.01) = 6.4 m m$

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