Number of subdivision per meter length of a levelling staff is

The most accurate measurement of the length of a long survey lines is made by using?

A staff reading taken on a bench mark or a point of known elevation is called

The least count of prismatic compass is

In case of geographical maps, the scale is usually

Cross-staff is used for

In a survey it was recorded that Σ Rise = 0, then

Accurate centering of a plane table is done by

The method generally preferred to for contouring an undulating area is,