Concrete Technology MCQs with answers Page - 56

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Q. If 30% excess water is added, the strength of concrete is reduced by ?

  • (A) 30%
  • (B) 40%
  • (C) 50%
  • (D) 60%

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Q. Which of the following ingredient of cement when added in excess quantity, causes the cement set slowly ?

  • (A) Lime
  • (B) Silica
  • (C) alumina
  • (D) iron oxide

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Q. The controlled concrete is used for ?

  • (A) one grade of concrete mix
  • (B) three grades of concrete mix
  • (C) five grades of concrete mix
  • (D) all the seven grades of concrete mix

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Q. Which of the following statement is wrong ?

  • (A) The concrete can not be pumped
  • (B) The concrete should have maximum creep
  • (C) The concrete structures can be put to use immediately after their construction
  • (D) all of the above

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Q. The correct proportioning various ingredients of concrete largely depends upon ?

  • (A) bulking of sand
  • (B) water content
  • (C) absorption
  • (D) all of these

A

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Q. For compacting large sections of mass concrete in structures, the type of vibrator used is ?

  • (A) internal vibrator
  • (B) screed vibrator
  • (C) form vibrator
  • (D) all of these

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Q. In lime concrete, lime is used as ?

  • (A) coarse aggregate
  • (B) fine aggregate
  • (C) binding material
  • (D) admixture

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Q. The sum of the percentage of tricalcium silicate and dicalcium silicate for Portland cement varies from ?

  • (A) 50 to 60%
  • (B) 60 to 70%
  • (C) 70 to 80%
  • (D) 80 to 90%

A

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Q. The resistance of an aggregate to wear is known as ?

  • (A) shear value
  • (B) crushing value
  • (C) abrasion value
  • (D) impact value

A

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Q. Which of following proportion of different ingredients of concrete mix confirm to the arbitrary method of mixing ?

  • (A) 1:2:5
  • (B) 1:3:7
  • (C) 1:4:8
  • (D) 1:5:9

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