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

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

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Surveying
Sidereal day

Is the period of time taken by the earth in making a complete rotation with reference to stars
Is slightly shorter than an ordinary solar day
All listed here
Is divided into the conventional hours, minutes and seconds

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