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__________________ is used for designing the old road to a predetermined depth.

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________ is used for designing the old road to a predetermined depth.

(a) Grader

(b) Scarifier

(c) Road roller

(d) Scraper

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The correct choice is (b) Scarifier

For explanation: Scraper contents teeth which are known as Tynes. Grader is used for spreading lose material, constructing earth roads and for giving shape to the subgrade. It is either self propelled or is towed by tractor.
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