Which part of Vernier calipers is used to measure internal dimensions?

The least count of the Vernier calipers described in the chapter is:

Which part of Vernier calipers is used to measure depth?

Vernier calipers are mainly used to measure:

If the zero of the Vernier scale is to the right of the zero of the main scale, the instrument shows:

Why should the zero mark of a metre rule coincide with one edge of the object?

If the zero of the Vernier scale is to the left of the zero of the main scale, the correction is made by:

Which practice helps reduce parallax error while using a metre rule?

A micrometer screw gauge is more suitable than Vernier calipers for measuring:

The least count of a measuring instrument means:

The least count of the micrometer screw gauge described in the chapter is: