Surveying
For a line AB

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

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Surveying
Theodolite is an instrument used for

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

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Surveying
A telescope is said to be inverted if its

vertical circle is to its right and the bubble of the telescope is up
vertical circle is to its left and the bubble of the telescope is up
vertical circle is to its right and the bubble of the telescope is down
vertical circle is to its left and the bubble of the telescope is down

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