Question

The least count of a screw gauge can be decreased by

• A. increasing the total number of divisions on the circular scale
• B. decreasing the total number of divisions on the circular scale
• C. breaking the screw gauge into two
• D. constructing the gauge with a mixture of iron and lead

Answer 1

The correct option is A increasing the total number of divisions on the circular scale

For a screw gauge,
$\text{L.C.}=\frac{\text{Pitch of the screw}}{\text{Circular scale divisions}}$

Hence, the least count of a screw gauge can be decreased by decreasing the pitch or increasing the total number of divisions on the circular scale.