Which of the following is an efficient method of levelling that should be adopted to measure the elevation of two points when the distance between them is NOT within the visible range of the level?

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SSC JE Civil 05 Jun 2024 Shift 1 Official Paper - 1
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  1. Block levelling
  2. Differential levelling
  3. Profile levelling
  4. Reciprocal levelling

Answer (Detailed Solution Below)

Option 2 : Differential levelling
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Explanation:

Differential levelling:

(i) It is the method of levelling to determine the elevation of points located at some distance apart or to determine the elevation difference between two points or to establish benchmarks. 

(ii) The method is used in order to find the difference in elevations between two points:

  • If they are far apart
  • The difference in elevation between the two points is too great
  • If there are obstacles intervening

Additional InformationBlock Levelling

  • Definition: Block levelling is a surveying method used to determine the elevation of the ground over a large area by dividing it into smaller blocks or grids.

Profile Levelling

  • Definition: Profile levelling is a type of surveying method used to find the elevation along a line, typically a centerline of a road, railway, pipeline, or similar construction project.

Reciprocal Levelling

  • Definition: Reciprocal levelling is a technique used to determine the difference in elevation between two points when they are far apart or when obstacles prevent direct line-of-sight measurement.
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