1.

Sleepers (ties) are mostly made up of _______________(a) wood(b) prestressed concrete(c) metal(d) steak

Answer» Right choice is (b) prestressed concrete

Easiest explanation: Prestressed concrete is a form of concrete used in construction which is “pre-stressed” by being placed under compression prior to supporting any loads beyond its own dead weight. This compression is produced by the tensioning of high-strength “tendons” located within or adjacent to the concrete volume and is done to improve the performance of the concrete in service.


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