Surveying
Normal tension is that pull which

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

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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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