First slide

Measurement

Question

A screw gauge has a screw having 2 threads in 1mm. The circular scale has 50 divisions. Find the diameter of wire, if the main scale shows 6th division and the circular reads 4

Moderate

A

6.46 mm
B

3.46mm
C

6.54mm
D

3.04mm

Solution

$Least count= \frac{pitch}{Number of divisions} = \frac{0.5}{50} = 0.01 mm$
$Diameter of wire = 6 \times 0.5 + 4 \times 0.01 = 3.04 m m$
Therefore, the correct answer is (D).

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