Surveying
If the staff is not held vertical at a level¬ling station, the reduced level calculated from the observation would be

None of these
less than true R.L.
more than true R.L.
true R.L.

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Surveying
The meridian of a place is

An arc of the great circle which passes through the place and is perpendicular to the equator
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

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Surveying
A ’level line’ is a

line parallel to the mean spheriodal surface of earth
line passing through the center of cross hairs and the center of eye piece
horizontal line
line passing through the objective lens and the eye-piece of a dumpy or tilting level

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