Surveying
The most convenient co-ordinate system for specifying the relative positions of heavenly bodies on the celestial sphere, is

Declination and right ascension system
Altitude and azimuth system
Declination and altitude system
Declination and hour angle system

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

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