Surveying
Which of the following is not the function of levelling head ?

to provide a means for leveling the theodolite
to support the main part of the instrument
to attach the theodolite to the tripod
None of these

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

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