Surveying
The time interval between successive transits of the moon, is

24 hours 50 minutes
23 hours 50 minutes
24 hours 10 minutes
20 hours 25 minutes

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Surveying
Dumpy level is most suitable when

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
All of these

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