Concrete Technology MCQs with answers Page - 78

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Q. Shrinkage in concrete can be reduced by using

  • (A) low water cement ratio
  • (B) less cement in the concrete
  • (C) proper concrete mix
  • (D) all the above

A

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Q. The shuttering of a hall measuring 4 m × 5 m, can be removed after

  • (A) 5 days
  • (B) 7 days
  • (C) 10 days
  • (D) 14 days

A

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Q. The approximate value of the ratio between direct tensile strength and flexural strength is

  • (A) 0.33
  • (B) 0.5
  • (C) 0.75
  • (D) 1.0

A

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Q. Workability of concrete is inversely proportional to

  • (A) time of transit
  • (B) water-cement ratio
  • (C) the air in the mix
  • (D) size of aggregate

A

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Q. If a beam fails in bond, then its bond strength can be increased most economically by

  • (A) increasing the depth of beam
  • (B) using thinner bars but more in number
  • (C) using thicker bars but less in number
  • (D) providing vertical stirrups

A

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Q. Ordinary Portland cement is manufactured from

  • (A) lime stone and clay
  • (B) gypsum and lime
  • (C) pozzolana
  • (D) lime, pozzolana and clay

A

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Q. The percentage of reinforcement in case of slabs, when high strength deformed bars are used is not less than

  • (A) 0.15
  • (B) 0.12
  • (C) 0.30
  • (D) 1.00

A

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Q. Addition of pozzolana to cement

  • (A) decreases workability
  • (B) increases strength
  • (C) increases heat of hydration
  • (D) none of these

A

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Q. If 50 kg of fine aggregates and 100 kg of coarse aggregates are mixed in a concrete whose water cement ratio is 0.6, the weight of water required for harsh mix, is

  • (A) 8 kg
  • (B) 10 kg
  • (C) 12 kg
  • (D) 14 kg

A

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Q. The minimum cover to the ties or spirals should not be less than

  • (A) 15 mm
  • (B) 20 mm
  • (C) 25 mm
  • (D) 50 mm

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