Surveying
For a line AB

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

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Surveying
Dumpy level is most suitable when

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

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