When the object lies on the left hand side of the chain line, then while taking offset with an optical square, it is held in ............

Grid lines are parallel to ............

To use the Abney clinometer as Abney level the vernier should read ............

When the back staff reading and forward staff reading at a station of levelling are the same, their difference shall be …

Direct method of contouring is ............

In survey it was recorded that ΣRise = 0, then ............

In setting up a plane table at any station ............

When the image formed by the objective is not situated in the plane of cross-hairs ............

Cross hairs in surveying telescope, are fitted ............