Surveying
Contour interval is

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

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Surveying
Spring tides are caused when

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

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

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

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