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Q: Check lines (or proof lines) in Chain Surveying are essentially required ...........
  • A. to plot the chain lines
  • B. to plot the offsets
  • C. to indicate the accuracy of the survey work
  • D. to increase the out-turn
Correct Answer: Option C - Check lines– Check lines or proof lines are the lines which are run in the field to check the accuracy of the work. The length of the check line measured in the field must agree with its length on the plan. A check line may be laid by joining the apex of the triangle to may point on the opposite side or by joining two points on any two sides of a triangle. • Each triangle must have a check line.
C. Check lines– Check lines or proof lines are the lines which are run in the field to check the accuracy of the work. The length of the check line measured in the field must agree with its length on the plan. A check line may be laid by joining the apex of the triangle to may point on the opposite side or by joining two points on any two sides of a triangle. • Each triangle must have a check line.

Explanations:

Check lines– Check lines or proof lines are the lines which are run in the field to check the accuracy of the work. The length of the check line measured in the field must agree with its length on the plan. A check line may be laid by joining the apex of the triangle to may point on the opposite side or by joining two points on any two sides of a triangle. • Each triangle must have a check line.