A. completely eliminates curvature correction
B. partially eliminates curvature correction
C. adds to the curvature correction
D. has no effect on curvature correction
Answer: Option B
A. Error due to refraction may not be completely eliminated by reciprocal levelling.
B. Tilting levels are commonly used for precision work.
C. The last reading of levelling is always a foresight.
D. All of the above statements are incorrect.
C. not change
D. either ‘A’ or ‘B’