7 MPa
11.5 MPa
16 MPa
21 MPa
Answer is Right!
Answer is Wrong!
The correct answer is A. 7 MPa.
According to IS 456:2000, the minimum compressive strength of ordinary Portland cement after three days should not be less than 7 MPa. This is to ensure that the concrete is strong enough to withstand the loads that it will be subjected to.
Option B is incorrect because the minimum compressive strength of ordinary Portland cement after three days should not be less than 7 MPa.
Option C is incorrect because the minimum compressive strength of ordinary Portland cement after three days should not be less than 7 MPa.
Option D is incorrect because the minimum compressive strength of ordinary Portland cement after three days should not be less than 7 MPa.