Surveying
Pick up the incorrect statement from the following. The angular distance of heavenly bodies on observer's meridian measured from the pole, is

Co-latitude
Co-declination
Polar distance
Co-altitude

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Surveying
Refraction correction

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

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Surveying
Dumpy level is most suitable when

fly levelling is being done over long distance
many readings are to be taken from a single setting of the instrument
the instrument is to be shifted frequently
All of these

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