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Q: The grade of concrete is usually designated as M20, M25 etc. as per IS : 456-2000, where M refers to the concrete mix and the number to the specified compressive strength of a cube of concrete at 28 days expressed in N/mm2. What is the size of this cube (each side of cube) use for testing the specified compressive strength?
  • A. 150 mm
  • B. 100 mm
  • C. 250 mm
  • D. 300 mm
Correct Answer: Option A -
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Explanations:

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