Surveying
The correction applied to the measured base of length ‘L’ is

Tension = (P - Ps)L/AE
All of these
Sag = L³w²/24P² where w is the weight of tape/m
Slope = (h²/2L) + (h⁴/8L³) where h is height difference of end supports

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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 level The correct answer is

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

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