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
If altitude bubble is provided both on index frame as well as on telescope of a theodolite, then the instrument is levelled with reference toi) altitude bubble on index frameii) altitude bubble on index frame if it is to be used as a leveliii) altitude bubble on telescopeiv) altitude bubble on telescope if it is to be used as a levelThe correct answer is

both (ii) and (iii)
only (i)
both (i) and (iv)
only (iii)

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