Ordinary Portland Cement

Q. According the IS specification, the compressive strength of ordinary Portland cement after three days should not be less than :

1. 7 MPa
2. 1.5 MPa
3. 16 MPa
4. 21 MPa

Q. The compressive strength requirements of 53 grade O.P.C cement as per IS 12269 at 3, 7 and 28 days in N/mm${}^2$ are

1. 33, 43, 53
2. 27, 37, 53
3. 33, 47, 53
4. 27, 45, 53

Q. The specific surface (in cm${}^2$/g) of good portland cement should not be less than:

1. 500
2. 1100
3. 2250
4. 3200

Q. The two main compounds of Ordinary Portland Cement are

1. Tricalcium Silicate and Dicalcium Silicate
2. Dicalcium Silicate and Alkali Oxide
3. Tricalcium Aluminates and Alkali Oxide
4. Tricalcium Silicate and Alkali Oxide