Surveying
Which of the following errors can be neutralised by setting the level midway between the two stations ?

error due to refraction only
error due to curvature only
error due to both curvature and re-fraction
None of these

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Surveying
The length of a chain is measured from

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

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