Surveying
The latitude of a place was obtained by subtracting the declination of a star from its zenith distance, the observed star was between

Pole and horizon
Horizon and equator
Zenith and pole
Equator and zenith

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Surveying
Normal tension is that pull which

makes the correction due to sag equal to zero
makes the correction due to pull equal to zero
is used at the time of standardising the tape
neutralizes the effect due to pull and sag

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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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