When the magnetic bearing of the sun at noon is 185°20', the magnetic declination will be ............

The horizontal angle between true meridian and magnetic meridian at a place is called ............

An imaginary line tangential to the longitudinal curve of the level at the centre of the tie is called ............

The variation of magnetic declination within a day is called ............

Number of subdivisions per metre length of a leveling staff is ............

Left swing is not much favoured in theodolite survey because ............

Volume of the earth work may be calculated by ............

A tie line in a chain surveying ............

From any point on the surface with a given inclination ............