The method of surveying used for determining the relative height of points on the surface of the earth is called ............

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

The accuracy in laying down the perpendicular offsets and in measuring them depends upon ............

Height of instrument method of leveling is ............

A line joining some fixed points on the main survey lines, is called a ............

A simple circular curve is designated by ............

An important rule in using pantograph is ............

The line of sight is kept as high above ground surface as possible to minimize the error in the observed angles due to .…

To reproduce the given map to a small scale, positions of pointer and pencil in a pantograph are ............