Surveying
If the staff is not held vertical at a level¬ling station, the reduced level calculated from the observation would be

None of these
true R.L.
less than true R.L.
more than true R.L.

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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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