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
more than true R.L.
less than true R.L.
true R.L.

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Surveying
For a line AB

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

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Surveying
Sidereal day

Is divided into the conventional hours, minutes and seconds
All listed here
Is slightly shorter than an ordinary solar day
Is the period of time taken by the earth in making a complete rotation with reference to stars

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