Early attainment of strength in rapid hardening cement is mainly due to_______________?

Related Mcqs:

1. For testing compressive and tensile strength of cement, the cement mortar is made by mixing cement and standard sand in the proportions of___________________?

   A. 1:2
   B. 1:3
   C. 1:4
   D. 1:6

2. Compared to mild steel, cast iron has (1) high compressive strength (2) high tensile strength (3) low compressive strength (4) low tensile strength The correct answer is_________________?

   A. (1) and (2)
   B. (2) and (3)
   C. (3) and (4)
   D. (1)and(4)

3. Assertion A : Pure lime takes a long time to develop adequate strength. Reason R : Pure lime has slow hardening characteristics. Select your answer according to the coding system given below ?

   A. Both A and R are true and R is correct explanation of A
   B. Both A and R are true and R is not a correct explanation of A
   C. A is true but R is false
   D. A is false but R is true

4. The constituent of cement which is responsible for all the undesirable properties of cement is____________?

   A. dicalcium silicate
   B. tricalcium silicate
   C. tricalcium aluminate
   D. tetra calcium alumino ferrite

5. The main constituent of cement which is responsible for initial setting of cement is_________________?

   A. dicalcium silicate
   B. tricalcium silicate
   C. tricalcium aluminate
   D. all of the above

6. The maximum quantity of calcium chloride used as an accelerator in cement in percentage by weight of cement is_______________?

   A. 1
   B. 2
   C. 3
   D. 4

7. Quick lime is (1) slow in setting (2) rapid in slacking (3) good in strength The correct answer is____________?

   A. only (1)
   B. only (2)
   C. both (1) and (2)
   D. both (2) and (3)

8. For testing compressive strength of cement, the size of cube used is_______________?

   A. 50 mm
   B. 70.6 mm
   C. 100 mm
   D. 150 mm

9. According to IS specifications, the compressive strength of ordinary portland cement after three days should not be less than________________?

   A. 7 MPa
   B. 11.5 MPa
   C. 16 MPa
   D. 21 MPa

10. The main ingredients of Portland cement are________________?

    A. lime and silica
    B. lime and alumina
    C. silica and alumina
    D. lime and iron