Determining the difference in elevation between two points on the surface of the earth, is known as ............

A reverse curve consists of ............

While surveying a plot of land by plane tabling, the field observations ............

The theodolite is an instrument used for measuring very accurately ............

Handles of chains are made up of ............

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

The following sights are taken on the turning point ............

Resolving power of a telescope depends on ............

The process of turning the telescope about the vertical axis in horizontal plane is known as ............