Surveying
A ’level line’ is a

line passing through the center of cross hairs and the center of eye piece
line passing through the objective lens and the eye-piece of a dumpy or tilting level
horizontal line
line parallel to the mean spheriodal surface of earth

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Surveying
Spring tides are caused when

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

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