Surveying
If the length of a chain is found to be short on testing, it can be adjusted by

All of these
straightening the links
closing the joints of the rings if opened out
removing one or more small circular rings

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

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

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