Surveying
Subtense bar is an instrument used for

measurement of horizontal distances in undulated areas
measurement of horizontal distances in plane areas
measurement of angles
levelling

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Surveying
Refraction correction

completely eliminates curvature correction
has no effect on curvature correction
partially eliminates curvature correction
adds to the curvature correction

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

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