Surveying
Contour interval is

Larger for accurate works
Larger if the time available is more
Directly proportional to the flatness of ground
Inversely proportional to the scale of the map

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Surveying
Normal tension is that pull which

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

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