An imaginary line tangential to the longitudinal curve of the level at the centre of the tube is called
A)horizontal axis
B)vertical axis
C)axis of the level tube
D)line of collimation

Question

Quizplus · Accepted Answer

The axis of the level tube is an imaginary line that is tangential to the longitudinal curve of the level at the center of the tube, representing the direction of the bubble movement and the alignment of the level.

An Imaginary Line Tangential to the Longitudinal Curve of the Level