A level line is ............

Diaphragm of a surveying telescope is held inside ............

An axis about which the telescope can be rotated in a horizontal plane is called ............

Height of instrument method of leveling is ............

The sensitiveness of a level tube decreases if ............

Indirect ranging is adopted when the two ends of chain line are ............

In a theodolite the line of collimation is ............

The surveying used to determine additional details such as boundaries of fields, is called ............

The vertical distance above or below the datum is called ............