Surveying
In the double application of principle of reversion, the apparent error is

two times the true error
four times the true error
half the true error
equal to true error

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Surveying
The meridian of a place is

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

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