Surveying
Pick up the correct statement from the following. The difference between the longitudes of the places is obtained.

By subtracting their longitudes if places are in the same hemisphere
All of these
By subtracting the sum of their longitudes exceeding 180° from 360° if places are in different hemispheres
By adding their longitudes if places are in the different hemispheres

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Surveying
Normal tension is that pull which

makes the correction due to sag equal to zero
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

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