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

Celestial equator
Equator
Ecliptic
None of these

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Surveying
Contour interval is

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

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