Indirect ranging is adopted when the two ends of chain line are ............

The number of horizontal cross wires in a stadia diaphrgram is ............

The contour interval depends upon the ............

While doing leveling in undulating terrain, it is preferable to set level on ............

Drop arrow is used in ............

Offsets are ............

The magnetic bearing of a line is 32° and the magnetic declination is 10°15'W. The true bearing is ............

Bergchund is a topographical feature in ............

Removal of parallax, may be achieved by focusing ............