Surveying
A ’level line’ is a

line passing through the objective lens and the eye-piece of a dumpy or tilting level
line passing through the center of cross hairs and the center of eye piece
horizontal line
line parallel to the mean spheriodal surface of earth

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

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

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Surveying
A telescope is said to be inverted if its

vertical circle is to its left and the bubble of the telescope is down
vertical circle is to its right and the bubble of the telescope is down
vertical circle is to its left and the bubble of the telescope is up
vertical circle is to its right and the bubble of the telescope is up

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