A surface which is normal to the direction of gravity at all points, as indicated by a plumb line, is known as

Which one of the following mistakes/errors may be cumulative positive or negative?

When it is not possible to set up the level, midway between the two points, then the difference in elevation between the…

Levelling deals with measurements in

The maximum allowable limit up to that a measurement may vary from the true value is known as

A method of differential levelling is used in order to find the difference in elevation between two points when

In chain surveying, perpendiculars to the chain line, are set out by

If the back sight and fore sight distance are kept equal during levelling observations, then the effect of both refracti…

Perpendicularity of an offset may be judged by eye, if the length of the offset is