Concrete Technology MCQs with answers Page - 8

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Admin • 833.24K Points
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Q. Maximum permissible limit of magnesia content in OPC is…

  • (A) 4 %
  • (B) 6%
  • (C) 8%
  • (D) 10%

A

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Q. Reduction in the quantity of mixing water which is possible by the use of plasticizers and admixture varies from

  • (A) 1% to 5%
  • (B) 5% to 15%
  • (C) 15% to 25%
  • (D) 25% to 35%

A

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Q. Which of the following types of concrete mixture is most commonly used in precast concrete factories?

  • (A) truck mounted mixture
  • (B) pan type mixer
  • (C) dual drum mixture
  • (D) tilting drum mixture

A

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Q. According to IS : 456-1978 minimum period stipulated for most curing of concrete using ordinary Portland cement is

  • (A) 3 days
  • (B) 7 days
  • (C) 14 days
  • (D) 28 days

A

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Q. For reinforced concrete exposed to sulphate attack minimum grade required is

  • (A) M10
  • (B) M15
  • (C) M20
  • (D) M25

A

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Q. The deterioration of concrete take place due to.

  • (A) Salt solution
  • (B) Alkalies
  • (C) Fertilizers
  • (D) All of the above

A

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Q. Cement content should be such that concrete has sufficient alkalinity (PH value).

  • (A) True
  • (B) False
  • (C) none
  • (D) all

A

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Q. For sea water concreting …………. cement shall be used.

  • (A) Portland slag cement
  • (B) Portland pozzolana slag cement
  • (C) Super sulphated cement
  • (D) All of above

A

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Q. Durability of concrete can be improved by impregnation of …………… in the voids of concrete.

  • (A) polymer
  • (B) cement
  • (C) Lime
  • (D) Soda

A

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Q. What do you mean by admixtures?

  • (A) Ingredients which are added to in cement before or after concrete mix
  • (B) Ingredients which are added to make aggregates healthier
  • (C) Ingredients added in cement to make it shinier
  • (D) Ingredients added in concrete to make good workability

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