Discussion :: Surveying  Section 1 (Q.No.47)
47. 
For true difference in elevations between two points A and B, the level must be set up 
[A]. 
at any point between A and B  [B]. 
at the exact mid point of A and B  [C]. 
near the point A  [D]. 
near the point B. 
Answer: Option B
Explanation:
No answer description available for this question.

Mohammed Libinshad.K said:
(Apr 5, 2015)


We take in differential leveling for accuracy for sight = back sight. 
Pradeep Raghu said:
(Sep 25, 2016)


For the minimum error due to curvature and refraction, the level must be set such that back sight and foresight distances are equal. 
Akki said:
(Sep 8, 2018)


I think option A is correct. 
V.V.Patel said:
(Oct 11, 2018)


Thanks @Pradeep. 
Baliram said:
(Sep 17, 2021)


Option B is the correct answer. 