Imaginary line passing through points having equal magnetic declination is termed as ............

A scale which has a common representative fraction, but read in different measures, is called a ............

The image formed by the objective in the plane of cross hairs is ............

A check line in a chain surveying ............

A deflection angle is ............

An example for a level surface is ............

If the fore bearing of a line is N26°35'W, its back bearing will be ............

Cumulative error that occur in chaining are proportional to ............

A plumb bob is required ............