The slump recommended for mass concrete is about_______________?

Related Mcqs:

1. Assertion A : Normally turpentine oil is recommended as thinner for indoor painting. Reason R : Turpentine oil is costlier than other thinners. Select your answer according to the coding system given below ?

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

2. Assertion A : Paints with white lead base are not recommended for painting of iron works. Reason R : Paints with white lead base do not check rusting of iron. Select your answer according to the coding system given below ?

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

3. Which of the following cements is suitable for use in massive concrete structures such as large dams ?

   A. ordinary Portland cement
   B. low heat cement
   C. rapid hardening cement
   D. sulphate resisting cement

4. The most common admixture which is used to accelerate the initial set of concrete is______________?

   A. gypsum
   B. calcium chloride
   C. calcium carbonate
   D. none of the above

5. The basic purpose of a retarder in concrete is_____________?

   A. to increase the initial setting time of cement paste in concrete
   B. to decrease the initial setting time of cement paste in concrete
   C. to render the concrete more water tight
   D. to improve the workability of concrete mix

6. Proper amount of entrained air in concrete results in__________?

   1. better workability
   2. better resistance to freezing and thawing
   3. lesser workability
   4. less resistance to freezing and thawing The correct answer is:

    

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

7. Crushing strength of a good building stone should be more than____________?

   A. 50 MPa
   B. 100 MPa
   C. 150 MPa
   D. 200 MPa

8. Crushing strength of a first class brick should not be less than_____________?

   A. 3.5 N/mm2
   B. 7.0 N/mm2
   C. 10.5 N/mm2
   D. 14.0 N/mm2

9. After storage, the strength of cement________________?

   A. decreases
   B. increases
   C. remains same
   D. may increase or decrease

10. In case of foundations on black cotton soils, the most suitable method to increase the bearing capacity of soils is to_________________?

    A. increase the depth of foundation
    B. drain the soil
    C. compact the soil
    D. replace the poor soil