Chain surveying consists of the arrangement of framework of triangles because a triangle is the only simple plane figure which can be plotted uniquely if ............ of the triangle are known.

Surveys which are carried out to provide a national grid of control for preparation of accurate maps of large areas, are…

An axis about which the telescope can be rotated in a horizontal plane is called ............

Collimation method is use in ............

In the surveying telescope, diaphragm is held ............

Contours of different elevations may cross each other only in the case of ............

Reciprocal leveling eliminates ............

A metallic tape is made of ............

The error in measured length due to incorrect holding of chain is ............