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In reciprocal levelling, the error which is not completely eliminated, is due to

  • a)
    earth’s curvature

  • b)
    non-adjustment of line of collimation

  • c)
    refraction

  • d)
    non-adjustment of the bubble tube

Correct answer is option 'C'. Can you explain this answer?
Verified Answer
In reciprocal levelling, the error which is not completely eliminated,...
Reciprocal Leveling:



  • ​This technique of leveling work is used to find the exact height difference or to find the exact RL(Reduce level) of the point by equalizing the distance when there is a large obstruction like a river, ponds, lakes, etc. in direction of the survey.


  • It eliminates the following errors:


    i) error in instrument adjustments i.e error due to collimation


    ii) the combined effect of Earth's curvature and the refraction of the atmosphere


    iii) variation in the average refraction.



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Most Upvoted Answer
In reciprocal levelling, the error which is not completely eliminated,...
's curvature
b)refraction of light
c)temperature variations in the atmosphere
d)imperfections in the level instrument
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Community Answer
In reciprocal levelling, the error which is not completely eliminated,...
Reciprocal Leveling:
  • ​This technique of leveling work is used to find the exact height difference or to find the exact RL(Reduce level) of the point by equalizing the distance when there is a large obstruction like a river, ponds, lakes, etc. in direction of the survey.
  • It eliminates the following errors:
    i) error in instrument adjustments i.e error due to collimation
    ii) the combined effect of Earth's curvature and the refraction of the atmosphere
    iii) variation in the average refraction.
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In reciprocal levelling, the error which is not completely eliminated, is due toa)earth’s curvatureb)non-adjustment of line of collimationc)refractiond)non-adjustment of the bubble tubeCorrect answer is option 'C'. Can you explain this answer?
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