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

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

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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
is used at the time of standardising the tape
makes the correction due to sag equal to zero

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