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Q: Ordinary concrete is not used for concrete
  • A. M 10
  • B. M 15
  • C. M 20
  • D. M 40
Correct Answer: Option D - According to IS 456–2000 M 10 – M 20 → ordinary concrete M 25 – M 60 → Standard concrete M 65 – M 100 → High strength concrete M 40 is used for pre-tensioned, pre stressed concrete works.
D. According to IS 456–2000 M 10 – M 20 → ordinary concrete M 25 – M 60 → Standard concrete M 65 – M 100 → High strength concrete M 40 is used for pre-tensioned, pre stressed concrete works.

Explanations:

According to IS 456–2000 M 10 – M 20 → ordinary concrete M 25 – M 60 → Standard concrete M 65 – M 100 → High strength concrete M 40 is used for pre-tensioned, pre stressed concrete works.