Concrete Technology MCQs with answers Page - 36

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Q. Under normal circumstances, the beam soffits may be removed after

  • (A) 2 days
  • (B) 7 days
  • (C) 14 days
  • (D) 21 days

A

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Q. The ratio of different ingredients (cement, sand and aggregate) in concrete mix of grade M 20 is

  • (A) 1 ; 1 : 2
  • (B) 1 ; 1.5 : 3
  • (C) 1 ; 2 : 4
  • (D) 1 ; 3 : 6

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Q. The concrete mix of grade M 25 means that the compressive strength of 15 cm cubes at 28 days after mixing is

  • (A) 15 N/mm2
  • (B) 20 N/mm2
  • (C) 25 N/mm2
  • (D) 30 N/mm2

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Q. The measuring 50 litres of aggregate, the inner dimensions of a farma should be

  • (A) 25 cm x 25 cm x 40 cm
  • (B) 29 cm x 29 cm x 48 cm
  • (C) 30 cm x 30 cm x 50 cm
  • (D) 31 cm x 31 cm x 52 cm

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Q. The test conducted in the laboratory on the specimen made out of trial concrete mix is called

  • (A) preliminary test
  • (B) slump test
  • (C) works test
  • (D) none of these

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Q. The capcity of a ware-house depends upon the

  • (A) floor area occupied by one cement bag
  • (B) height to which the cement bags are piled
  • (C) either (a) or (b)
  • (D) both (a) and (b)

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Q. For high degree of workability, the compaction factor is

  • (A) 0.65
  • (B) 0.75
  • (C) 0.85
  • (D) 0.95

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Q. The ratio of the volume of moist sand to the volume of dry sand is known as

  • (A) crushing value
  • (B) impact value
  • (C) bulking factor
  • (D) none of these

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Q. The object of curing is to

  • (A) prevent the loss of water by evaporation
  • (B) reduce the shrinkage of concrete
  • (C) preserve the properties of concrete
  • (D) all of these

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Q. The process of hardening the concrete mixes by keeping its surface moist for a certain period is called

  • (A) floating
  • (B) curing
  • (C) screeding
  • (D) none of these

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