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

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Surveying
A telescope is said to be inverted if its

vertical circle is to its left and the bubble of the telescope is down
vertical circle is to its left and the bubble of the telescope is up
vertical circle is to its right and the bubble of the telescope is up
vertical circle is to its right and the bubble of the telescope is down

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