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

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Surveying
Theodolite is an instrument used for

measurement of horizontal angles only
tightening the capstan-headed nuts of level tube
measurement of vertical angles only
measurement of both horizontal and vertical angles

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