Concrete Technology MCQs with answers Page - 80

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Q. The property of fresh concrete, in which the water in the mix tends to rise to the surface while placing and compacting, is called

  • (A) segregation
  • (B) bleeding
  • (C) bulking
  • (D) creep

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Q. Workability of concrete for a given water content is good if the aggregates, are

  • (A) rounded aggregate
  • (B) irregular aggregate
  • (C) angular aggregate
  • (D) flaky aggregates

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Q. For preparing ordinary concrete, the quantity of water used, is

  • (A) 5% by weight of aggregates plus 20% of weight of cement
  • (B) 10% by weight of aggregates plus 10% of weight of cement
  • (C) 5% by weight of aggregates plus 30% of weight of cement
  • (D) 30% by weight of aggregates plus 10% of weight of cement

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Q. Finer grinding of cement

  • (A) affects only the early development of strength
  • (B) affects only the ultimate strength
  • (C) both (a) and (b)
  • (D) does not affect the strength

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Q. The light weight aggregates are obtained from

  • (A) sedimentary rocks
  • (B) metamorphic rocks
  • (C) igneous rocks
  • (D) volcanic source

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Q. For walls, columns and vertical faces of all structural members, the form work is generally removed after

  • (A) 24 to 48 hours
  • (B) 3 days
  • (C) 7 days
  • (D) 14 days

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Q. For given workability the grading requiring the least amount of water is one that gives

  • (A) greatest surface area for the given cement and aggregates
  • (B) least surface area for the given cement and aggregates
  • (C) least weight for the given cement and aggregates
  • (D) greatest weight for the given cement and aggregates

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Q. Minimum pitch of transverse reinforcement in a column is

  • (A) the least lateral dimension of the member
  • (B) sixteen times the smallest diameter of longitudinal reinforcement bar to be tied
  • (C) forty-eight times the diameter of transverse reinforcement
  • (D) lesser of the above three values

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Q. Workability of concrete mix with low water cement ratio is determined by

  • (A) tensile strength test
  • (B) slump test
  • (C) compaction factor test
  • (D) flexural strength test

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Q. The effect of creep on modular ratio is

  • (A) to decrease it
  • (B) to increase it
  • (C) either to decrease or to increase it
  • (D) to keep it unchanged

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