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

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

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Surveying
Pick up the correct statement for horizontal photographs.

The lines parallel to the negative plane are projected as parallel lines
All listed here
The two sides of a road meet at the vanishing point
Parallel lines do not appear parallel in central projection

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Surveying
Contour interval is

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

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