Surveying
According to Napier's Rules of circular parts for a right angled triangle, sine of middle part equals the product of

Tangents of two adjacent parts
Both (A) and (B) above
Cosines of two adjacent parts
Sines of two adjacent parts

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

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