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Q: The Minimum grade of concrete can be made using nominal mix concrete shall be
  • A. M7.5
  • B. M10
  • C. M15
  • D. M5
Correct Answer: Option D - It is preferred to design the proportions of all the ingredients for all the grades of concrete mix. However, nominal mix concrete (viz., proportions or quantities by mass of materials) as specified in IS : 456-2000 may be used for concrete of grades M5, M7.5, M10, M15 and M20.
D. It is preferred to design the proportions of all the ingredients for all the grades of concrete mix. However, nominal mix concrete (viz., proportions or quantities by mass of materials) as specified in IS : 456-2000 may be used for concrete of grades M5, M7.5, M10, M15 and M20.

Explanations:

It is preferred to design the proportions of all the ingredients for all the grades of concrete mix. However, nominal mix concrete (viz., proportions or quantities by mass of materials) as specified in IS : 456-2000 may be used for concrete of grades M5, M7.5, M10, M15 and M20.