Pick up the correct statement from the following:
A. Refraction correction is zero when the celestial body is in the zenith
B. Refraction correction is 33' when the celestial body is on the horizon
C. Refraction correction of celestial bodies depends upon their altitudes
D. All the above
Answer: Option D
This Question Belongs to Civil Engineering >> Surveying
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Which of the following methods of contouring is most suitable for a hilly terrain?
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A. 750 mm × 900 mm
B. 600 mm × 750 mm
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