Concrete Technology - Concrete Technology objective questions and answers

11.  The concrete mix which does not give smooth finish easily is said to possess

   A. Hardness

   B. Roughness

   C. Internal friction

   D. Bleeding

12.  Which of the following acts as accelerator for concrete?

   A. Potassium chlorate

   B. Calcium chloride

   C. Copper sulphate

   D. Zinc oxide

13.  The entertained air in concrete results in

   A. Increased strength

   B. Decreased workability

   C. Increased workability

   D. Increased resistance to weathering

14.  Shrinkage in concrete increases its

   A. Tensile strength

   B. Flexural strength

   C. Bond strength

   D. Compressive strength

15.  If a concrete gives more strength than the design value

   A. Cement content is reduced

   B. Water percentage is increased

   C. Proportion of sand is changed

   D. Water / cement ratio is changed

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