Surveying
The great circle which passes through the zenith, nadir and the poles, is known as

Prime vertical
Vertical circle
None of these
Meridian

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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 level The correct answer is

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

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