Surveying
The declination and right ascension of the sun becomes 23° 27' S and 270° respectively on

March 21
September 21
June 21
December 22

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Surveying
Spring tides are caused when

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

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Surveying
Contour interval is

Inversely proportional to the scale of the map
Directly proportional to the flatness of ground
Larger if the time available is more
Larger for accurate works

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