The limiting length of an offset does not depend upon ............

Subtense tacheometry is generally preferred to if ground is ............

In the double application of principle of reversion, the apparent error is ............

The angle between two plane mirrors of optical square is ............

The approximate formula for radial or perpendicular offsets from the tangent, is ............

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

The true meridian of a place is the line in which earth's surface in intersected by a plane through ............

The horizontal equivalent which is a term generally uses in contoured map is ............

The length of an engineer's chain is ............