Surveying
The equation which is obtained by multiplying each equation by the coefficient of its unknowns and by adding the equations thus formed, is known as

Conditional equation
None of these
Observation equation
Normal equation

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Surveying
The meridian of a place is

A great circle whose plane is perpendicular to the axis of rotation and it also passes through the place
An arc of the great circle which passes through the place and is perpendicular to the equator
A semi-circle which passes through the place and is terminated at the poles
A great circle passing through the place and the poles

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Surveying
Systematic errors

All listed here
Are also known as cumulative errors
Always follow some definite mathematical law
Can be removed by applying corrections to the observed values

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