When several contours coincide, it indicates ............

In a reverse curve, the super elevation provided at the point of reverse curvature is ............

An instrument used for ranging is ............

Perpendicularity of an offset may be judged by eye, if the length of the offset is ............

An ideal vertical curve to join two gradients, is ............

"Cross-section" and "Longitudinal sectioning" is ............

A relatively fixed point of known elevation above datum, is called ............

Left swing is not much favoured in theodolite survey because ............

A clinometer is used for ............