Surveying
The distance between the minor control point and the principal point should be equal to

Mean of the base lines of the stereo pair
Base line of the right photograph of stereo pair
Sum of the base lines of stereo pair
Base line of the left photograph of stereo pair

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

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