Surveying
Spring tides are caused when

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

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Surveying
Dumpy level is most suitable when

All of these
the instrument is to be shifted frequently
many readings are to be taken from a single setting of the instrument
fly levelling is being done over long distance

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