Long offsets are taken if the offset length exceeds ............

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

Prismatic compass is considered more accurate than a surveyor's compass, because ............

If vertical angles of inclined sights do not exceed 10° and non-verticality of the staff remain within 1° stadia system …

If the staff is not held vertical at a leveling station, the reduced level calculated from the observation would be ....…

A clinometer is used for ............

The vertical angle between longitudinal axis of a freely suspended magnetic needle and a horizontal line at its pivot, i…

In case of double line river, contours are ............

The plotting of small areas which can be commanded from a single station, is usually done on the plane table by the meth…