When the bubble of the level tube of level, remains central ............

For true difference in elevations between two points A and B, the level must be set up ............

The amount of correction due to local attraction at a place ............

An invert is taken when the point is ............

While measuring a chain line between two stations A and B intervened by a raised ground ............

The method of surveying in which field work and plotting work are done simultaneously, is called ............

In horizontal angles, the error due to imperfect leveling of the plate bubble is ............

In a simple curve, "External distance" is the distance between ............

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