Question

Reciprocal levelling is used when,

(a) Flat terrain

(b) Obstacles are there

(c) BM not visible

(d) Highway construction

This question was posed to me in a job interview.

Query is from Methods of Levelling in section Basic Surveying of Basic Civil Engineering

Answer 1

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.