In measuring horizontal angles, the theodolite should be turned ............

An instrument used for ranging is ............

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

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

When the temperature rises, length of bubble ............

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

The deflection angle may have any value between ............

Usefullness of plane table is enhanced by providing ............

Two contour lines, having the same may cross each other only in the case of ............