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 level The correct answer is

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

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Surveying
In triangulation surveys

Sides are not measured excepting the base line
All listed here
Control stations are located from which detailed surveys are carried out
The area is divided into triangular figures

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