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 eccentricity of verniers
error due to imperfect graduations

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Surveying
In the prismatic compass

the graduated circle is fixed to the box and the magnetic needle always remains in the N-S direction
the line of the sight does not move with the box
the magnetic needle moves with the box
the magnetic needle and graduated circle do not move with the box

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