First slide

Accuracy; precision of instruments and errors in measurements

Question

Using screw gauge of pitch 0.1 cm and 50 divisions on its circular scale, the thickness of an object is measured. It should correctly be recorded as :

Easy

A

2.125 cm
B

2.124 cm
C

2.121 cm
D

2.123 cm

Solution

Least count, $L C = \frac{p i t c h}{n o o f d i v i s i o n} = \frac{0.1 c m}{50} = 0.002 c m$
Reading should be multiple of Least count.

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