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

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

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Surveying
Pick up the correct statement for horizontal photographs.

The two sides of a road meet at the vanishing point
The lines parallel to the negative plane are projected as parallel lines
All listed here
Parallel lines do not appear parallel in central projection

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