Surveying
Theodolite is an instrument used for

measurement of both horizontal and vertical angles
tightening the capstan-headed nuts of level tube
measurement of horizontal angles only
measurement of vertical angles only

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Surveying
For a line AB

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

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