Surveying
The great circle along which the sun appears to trace on the celestial sphere with earth as centre during the year, is called

Ecliptic
None of these
Equator
Celestial equator

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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

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

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