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

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Surveying
Dumpy level is most suitable when

All of these
the instrument is to be shifted frequently
many readings are to be taken from a single setting of the instrument
fly levelling is being done over long distance

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Surveying
Circumpolar stars

Remain always above the horizon
Rotate round the North Pole
Are seldom seen near the pole star
Rotate round the celestial pole

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