The tacheometric method of contouring is particularly suitable ............

The main object of running a tie line is ............

The line of collimation method of reduction of levels, does not provide a cheek on ............

When the back staff reading and forward staff reading at a station of levelling are the same, their difference shall be …

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

Surveys which are carried out to depict mountains, rivers, water bodies, wooded areas and other cultural details, are kn…

An 'are' is the unit of area of a square of side ............

An invar tape is made of an alloy of ............

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