For the revision of an existing survey with the help of plane table we generally use ............

The angle of intersection of a counter and a ridge line, is ............

Location of contour gradient for a highway is best set out from ............

Correction for slope is ............

The angle of intersection of a curve is the angle between ............

An angle made by a survey line with the prolongation of the proceeding line, is known as ............

The correction for sag is ............

Pick up the most accurate statement from the following ............

Accuracy of elevation of various points obtained from contour map is limited to ............