Surveying
The point at which sun's declination changes from north to south, is known as

Both (B) and (C) of the above
First point of Libra
Vernal Equinox
First point of Aeries

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Surveying
The difference between a level line and a horizontal line is that

level line is normal to plumb line while horizontal line may not be normal to plumb line at the tangent point to level line
both are same
level line is a curved line while hori-zontal line is a straight line
horizontal line is normal to plumb line while level line may not be normal to the plumb line

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Surveying
For a line AB

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

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