Least Count of Screw Gauge

Q.

What is the use of determining the pitch of a screw gauge?

Q.

Name the instrument that measures small length to highest accuracy.

Q.

A screw gauge was found to have a pitch equal to 0.8 mm. What should be the number of divisions on its head so that you can read up to 0.001 cm using this?

1. 8

2. Insufficient data

3. 80

4. 800

Q. The least count of a screw gauge can be decreased by

1. constructing the gauge with a mixture of iron and lead
2. increasing the total number of divisions on the circular scale
3. decreasing the total number of divisions on the circular scale
4. breaking the screw gauge into two

Q.

In a screw gauge, when a movable stud is in contact with a fixed stud, the 44th division of the head scale is found to be on the index line. If the pitch scale is calibrated in mm with a pitch of 1 mm and the number of divisions on the head scale is 50, then the zero correction is _________ mm.

1. $+1.2$

2. $–1.2$

3. $+0.12$

4. $–0.12$