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The difference of level between a point below the plane of sight and one above, is the sum of two staff readings and an error would be produced equal to

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The difference of level between a point below the plane of sight and one above, is the sum of two staff readings and an error would be produced equal to Answer: twice the distance between the zero of graduation and the foot of the staff

Question context

This question is part of 🚧 Civil Engineering within the broader 🛠️ Engineering Essentials subject and appears in the DemoPaper-Pakistan preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.