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

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

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Surveying
Normal tension is that pull which

makes the correction due to sag equal to zero
makes the correction due to pull equal to zero
is used at the time of standardising the tape
neutralizes the effect due to pull and sag

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