Surveying
If the reduced bearing of a line AB is N60°W and length is 100 m, then the latitude and departure respectively of the line AB will be

+50 m, +86.6 m
+50 m, -86.6 m
+70.7 m, -50 m
+86.6 m, -50 m

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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 semi-circle which passes through the place and is terminated at the poles
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

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Surveying
Which of the following errors can be eliminated by taking mean of bot face observations ?

error due to eccentricity of verniers
error due to line of collimation not being perpendicular to horizontal axis
error due to imperfect graduations
error due to imperfect adjustment of plate levels

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