Surveying
Which of the following errors can be neutralised by setting the level midway between the two stations ?

error due to curvature only
None of these
error due to refraction only
error due to both curvature and re-fraction

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Surveying
For a line AB

the forebearing of AB and back bearing of AB differ by 180°
the forebearing of AB and back bearing of BA differ by 180°
both (A) and (B) are correct
none is correct

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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

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

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