Surveying
For a line AB

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

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Surveying
Normal tension is that pull which

makes the correction due to pull equal to zero
neutralizes the effect due to pull and sag
is used at the time of standardising the tape
makes the correction due to sag equal to zero

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