Question

A screw gauge has a least count 0.001 cm and zero error + 0.007 cm. Draw a neat diagram to represent it ​

Answer 1

To show diagram, first of all you should understand some basic concept related to screw guage.

least count is the smallest value that can be measured with help of measuring instrument.

zero error : when zero of circular scale doesn't concide with zero of main scale in the screw guage, it is said have zero error. zero error will be positive when zero mark lies below the zero of main scale line.

now after understanding whole concept, you can easily draw using above statement.

see figure, it is required diagram.