Surveying
Dumpy level is most suitable when

All of these
many readings are to be taken from a single setting of the instrument
fly levelling is being done over long distance
the instrument is to be shifted frequently

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Surveying
For a line AB

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

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Surveying
Refraction correction

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

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