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

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

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Surveying
Normal tension is that pull which

is used at the time of standardising the tape
makes the correction due to pull equal to zero
makes the correction due to sag equal to zero
neutralizes the effect due to pull and sag

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