Surveying
The instrument used for accurate centering in plane table survey is

spirit level
alidade
plumbing fork
trough compass

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Surveying
The length of a chain is measured from

centre of one handle to centre of other handle
outside of one handle to outside of other handle
inside of one handle to inside of other handle
outside of one handle to inside of other handle

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Surveying
Bowditch rule is applied to

a closed traverse for adjustment of closing error
an open traverse for graphical adjustment
determine the effect of local attraction
None of these

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