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Reciprocal levelling is used when,(a) Flat terrain(b) Obstacles are there(c) BM not visible(d) Highway constructionThis question was posed to me in a job interview.Query is from Methods of Levelling in section Basic Surveying of Basic Civil Engineering

Answer»

Correct OPTION is (B) Obstacles are there

For explanation I would SAY: If the points to surveyed LIE on opposite banks of a river, reciprocal levelling can be used. It is done from both sides to eliminate CHANCES of error.



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