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
Transit rule of adjusting the consecutive coordinates of a traverse is used where

angular measurements are more accurate than linear measurements
linear and angular measurements of the traverse are of equal accuracy
linear measurements are more accurate than angular measurements
All of these

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