Surveying
Triangulation surveys are carried out for locating

All of these
Engineering works, i.e. terminal points of long tunnels, bridge abutments, etc.
Control points for surveys of large areas
Control points for photogrammetric surveys

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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

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

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