Due to curvature of earth the object ............

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

An instrument used to find slopes of ground is ............

Contour lines look to cross each other in case of ............

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

On a diagonal scale, it is possible to read up to ............

The instrument, belonging to a class of reflecting instrument is ............

The working from whole to the part is done in surveying in order to ensure that ............

For the Abney clinometer the semi-circular arc is graduated as ............