Surveying
The great circle along which the sun appears to trace on the celestial sphere with earth as centre during the year, is called

None of these
Celestial equator
Ecliptic
Equator

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Surveying
Contour interval is

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

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