The angle by which the forward tangent deflects from the back tangent of a curve is known as ............

A line joining the optical centre of the object glass and the centre of the eye piece is known as ............

The method of measuring distance by pacing is chiefly used in ............

Detailed plotting is generally done by ............

In a theodolite the line of collimation is ............

Dumpy level is most suitable when ............

A surface which is normal to the direction of gravity at all points as indicated by a plumb line is known as ...........…

The direction of steepest slope on a contour, is ............

If a 30 m chain diverges through a perpendicular distance from its correct alignment, the error in length is ...........…