Concrete Technology MCQs with answers Page - 6

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A

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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. In preliminary test, the concrete is placed in the mould in

  • (A) two
  • (B) three
  • (C) four
  • (D) five

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Q. To perform the initial setting time test, the water is added to the cement at the rate of

  • (A) 0.72 P
  • (B) 0.78 P
  • (C) 0.85 P
  • (D) 0.95 P

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Q. Excess quantity of water

  • (A) makes the concrete mix harsh
  • (B) makes the concrete mix unworkable
  • (C) causes segregation in concrete
  • (D) causes bleeding in concrete

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Q. The minimum particle size of fine aggregate is

  • (A) 0.0075 mm
  • (B) 0.075 mm
  • (C) 0.75 mm
  • (D) 0.95 mm

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Q. To prevent segregation, the concrete should not be thrown from a height of more than

  • (A) 1/2 m
  • (B) 1 m
  • (C) 1.5 m
  • (D) 2 m

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Q. The tricalcium aluminate in cement has the property of

  • (A) reacting fast with water
  • (B) causing initial setting of cement
  • (C) generating large amount of heat hydration
  • (D) all of these

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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 construction joints are generally provided in concrete

  • (A) roads
  • (B) retaining walls
  • (C) lining of tunnels
  • (D) all of these

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