250+ TOP MCQs on Types of Cement and Answers

Concrete Technology Multiple Choice Questions on “Types of Cement”.

1. Which chemical compostion has highest content in OPC?
a) Alumina
b) Silica
c) Lime
d) Iron Oxide
Answer: c
Clarification: Lime forms nearly two-third (2/3) of the cement. Therefore sufficient quantity of the lime must be in the raw materials for the manufacturing of cement.

2. Excess in lime causes _______
a) The cement to shrink and integrate
b) The cement to shrink and disintegrate
c) The cement to expand and integrate
d) The cement to expand and disintegrate
Answer: d
Clarification: Sufficient quantity of lime forms di-calcium silicate (C2SiO2) and tri-calcium silicate in the manufacturing of cement.

3. Silica in excess causes ________
a) The cement to set slowly
b) The cement to set quickly
c) The cement to expand
d) The cement to disintegrate
Answer: a
Clarification: Silica gives strength to the cement. Silica in excess causes the cement to set slowly.

4. Alumina in excess causes _________
a) Reduces the strength of the cement
b) Inceases the strength of the cement
c) No change
d) Sometimes increase or decrease the strength of the cement
Answer: a
Clarification: Alumina supports to set quickly to the cement. It also lowers the clinkering temperature. Alumina in excess reduces the strength of the cement.

5. Which compound gives the colour to the cement?
a) Lime
b) Silica
c) Iron Oxide
d) Alumina
Answer: c
Clarification: Iron oxide pigments are in the form of particles ranging approximately from 0.1 to 1.0 micron. The difference in color between one pigment and another is due to the shape and surface structure of the particle.

6. Which cement contains high percentage of C₃S and less percentage of C₂S?
a) Rapid Hardening Cement
b) Ordinary Portland Cement
c) Quick Setting Cement
d) Low Heat Cement
Answer: a
Clarification: This cement contains high percentage of C₃S and less percentage of C₃S. This is infact high early strength cement.

7. When concrete is to be laid under water ___________ is to used.
a) Rapid Hardening Cement
b) Ordinary Portland Cement
c) Quick Setting Cement
d) Low Heat Cement
Answer: c
Clarification: When concrete is to be laid under water, quick setting cement is to used. This cement is manufactured by adding small percentage of aluminum sulphate (Al₂SO₄) which accelerates the setting action.

8. Which of the following is correct for Low Heat Cement?
a) Suitable for use in cold weather areas
b) Heat of hydration is reduced by tri calcium aluminate content
c) This cement requires longer period of curing
d) This cement contains high aluminate %age usually between 35-55%.
Answer: b
Clarification: In this cement the heat of hydration is reduced by tri calcium aluminate content. It contains less percentage of lime than ordinary port land cement. It is used for mass concrete works such as dams etc.