Multiple Choice Question (MCQ)
Question: What is the compressive strength of 150 mm cube at 28 days ordinary concrete of grade M20?
A.
15 N/mm<sup>2</sup>
B.
20 N/mm<sup>2</sup>
C.
25 N/mm<sup>2</sup>
D.
30 N/mm<sup>2</sup>
Correct Answer: 20 N/mm<sup>2</sup>