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

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

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Surveying
For a line AB

the forebearing of AB and back bearing of AB differ by 180°
the forebearing of AB and back bearing of BA differ by 180°
none is correct
both (A) and (B) are correct

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Surveying
A ’level line’ is a

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

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