An arbitrary surface with reference to which the elevation of points are measured and compared, is called ............

If the smallest division of a vernier is longer than the smallest division of its primary scale, the vernier is known as…

For accurate work, the steel band should always be used in preference to chain because the steel band ............

The angle between the back tangent and forward tangent of a curve (in degrees) and length of the chord is 30 m, then the…

The sum of the interior angles of a geometrical figure laid on the surface of the earth differs from that of the corresp…

The longitudinal section of the surface of bubble tube is ............

When the image formed by the objective is not situated in the plane of cross-hairs ............

In case of a direct vernier scale ............

The traversing by the method of deflection angles is chiefly used in ............