Concrete Technology MCQs with answers Page - 74

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Q. The process of mixing, transporting, placing and compacting concrete using Ordinary Port land Cement should not take more than

  • (A) 30 minutes
  • (B) 40 minutes
  • (C) 60 minutes
  • (D) 90 minutes

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Q. The strength of concrete after one year as compared to 28 days strength is about

  • (A) 10 to 15% more
  • (B) 15 to 20% more
  • (C) 20 to 25% more
  • (D) 25 to 50% more

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Q. Specified compressive strength of concrete is obtained from cube tests at the end of

  • (A) 3 days
  • (B) 7 days
  • (C) 21 days
  • (D) 28 days

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Q. If the permissible stress in steel in tension is 140 N/mm², then the depth of neutral axis for a singly reinforced rectangular balanced section will be

  • (A) 0.35 d
  • (B) 0.40 d
  • (C) 0.45 d
  • (D) dependent on grade of concrete also

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Q. A construction joint is provided where

  • (A) bending moment is small
  • (B) shear force is small
  • (C) the member is supported by other member
  • (D) all the above

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Q. Sand generally contains salt if it is obtained from:

  • (A) nala beds
  • (B) river beds
  • (C) sea beds
  • (D) none of these

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Q. According to IS: 4561978, minimum slenderness ratio for a short column is

  • (A) less than 12
  • (B) less than 18
  • (C) between 18 and 24
  • (D) more than 24

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Q. Water cement ratio is

  • (A) volume of water to that of cement
  • (B) weight of water to that of cement
  • (C) weight of concrete to that of water
  • (D) both (a) and (b) of the above

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Q. For a concrete mix 1:3:6 and water cement ratio 0.6 both by weight, the quantity of water required per bag, is

  • (A) 10 kg
  • (B) 12 kg
  • (C) 14 kg
  • (D) 16 kg

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