Surveying
For a line AB

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

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Surveying
Spring tides are caused when

None of these
Sun and moon are in line with earth
Solar tidal force acts opposite to lunar tidal force
Solar tidal force and lunar tidal force both coincide

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