The tension, at which the effects of pull and sag for a tape are neutralised, is known as ............

Correction for curvature for a distance of 1 km = ............

Contours of different elevations may cross each other only in the case of ............

The tangent to the liquid surface in a level tube, is parallel to the axis of the bubble ............

To instrument resembling an alidade is ............

Anallatic lens is provided ............

Survey plotting can be done with an accuracy of ............

Ramsden eye-piece consists of ............

If the angle between index glass and horizon glasses of a box sextant is 40° the horizontal angle between A and B sight …