Surveying
The line of collimation method of reduction of levels, does not provide a check on

Back sights
Fore sights
Intermediate sights
Reduced levels

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

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