Question

A screw gauge has a pitch of 1 mm and 100 divisions on the circular scale. What is the least count of the instrument?

Options

• 0.1 mm

• 0.01 mm

• 0.001 mm

• 1 mm

Answer 1

0.01 mm

Explanation:

Least Count = Pitch ÷ Number of circular scale divisions = 1 mm ÷ 100 = 0.01 mm. The least count of a screw gauge defines the smallest measurement it can record, making it far more precise than a regular ruler.