The contour interval is kept inversely proportional to ............

The angle of intersection of the horizon glass and index glass in an optical square is ............

A diagonal scale is used to read ............ dimensions.

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

If d is the distance between equidistant odd ordinates, the Simpson's rule for the areas is ............

Closed contours of decreasing values toward their centre, represent ............

Profile leveling is usually done for determining ............

The altitude of a traverse leg is obtained by multiplying its length by ............

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