First slide

Measurement

Question

A screw gauge with a pitch of 0.3 mm and a circular scale with 100 divisions is used to measure the thickness of a thin sheet of steel. What is the thickness of the sheet if main scale reading is 1mm and the 30^th division coincides with the main scale line. (There is no zero error)?

Easy

A

1.9 mm
B

1.09 mm
C

1.1 mm
D

1.99 mm

Solution

$\begin{array}{l} Least count = \frac{pitch}{no. of division on circular scale} = \frac{0.3 mm}{100} = 0.003 mm \\ Measured value = 1 mm + (30 \times 0.003 mm) = 1.09 mm \end{array}$

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