If L is the measured length of a base line whose elevation is h above MSL: the necessary correction to reduce the base length to MSL is ............

Measuring with a 30 m chain, 0.01 m too short, introduces ............

The vertical angle between longitudinal axis of a freely suspended magnetic needle and a horizontal line at its pivot, i…

Determining the difference in elevation between two points on the surface of the earth, is known as ............

A line joining some fixed points on the main survey lines, is called a ............

When the magnetic declination is 5°20' east, the magnetic bearing of the sun at noon will be ............

The instrument, belonging to a class of reflecting instrument is ............

When a chain line encounters a river ............

When the angular and linear measurements are equally precise in traversing, the balancing of a traverse in done by .....…