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

both are same
level line is a curved line while hori-zontal line is a straight line
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

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Surveying
Spring tides are caused when

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

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