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M15 concrete is used for:

(a) Dams

(b) Foundation

(c) R.C.C

(d) Mass concreting works

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Correct answer is (b) Foundation

For explanation I would say: M10 is used for Mass concrete works, dams, etc.  M20 is used for R.C.C. structures. M15 can be used for ground floor construction also.

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