Surveying
A plate parallel is the line on the plane of the negative

Perpendicular to the principal line
None of these
Parallel to the principal line
Along the bisector of the angle between the principal line and a perpendicular line through principal plane

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

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

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