An open cross-staff is commonly used for setting out ............

Which of the following can be neutralized by setting the level midway between the two stations?

The approximate formula for radial or perpendicular offsets from the tangent, is ............

The two point problem and three point problem are methods of ............

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

The theodolite method off setting out a curve involves ............

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

Which of the following instrument is generally used for base line measurements?

The theodolites used for making tacheometric observations by optical wedge system, are ............