Surveying
Local attraction in compass surveying may exist due to

loss of magnetism of the needle
friction of the needle at the pivot
incorrect levelling of the magnetic needle
presence of magnetic substances near the instrument

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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

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

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