The survey stations set up during traversing with compass should be such that

Reading of the metric levelling staff can be taken accurately up to

An example for a level surface is

The main principle of surveying is to work

When the first object is to be focused, the scale, is set to 0° 00'00" and then

The method of surveying used for determining the relative height of points on the surface of the earth is called

The height of instrument is equal to

Profile levelling is usually done for determining

The most reliable method of plotting a theodolite traverse is