Surveying
For which of the following permanent adjustments of theodolite, the spire test is used ?

adjustment of horizontal axis
adjustment of line of sight
adjustment of plate levels
adjustment of altitude bubble and vertical index frame

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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 divided into the conventional hours, minutes and seconds
Is slightly shorter than an ordinary solar day
All listed here

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Surveying
Refraction correction

has no effect on curvature correction
completely eliminates curvature correction
adds to the curvature correction
partially eliminates curvature correction

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