Surveying
Check lines (or proof lines) in Chain Surveying, are essentially required

To plot the offsets
To plot the chain lines
To increase the out-turn
To indicate the accuracy of the survey work

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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
Sun and moon are in line with earth
None of these

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