Concrete Technology MCQs with answers Page - 81

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Q. The type of aggregates not suitable for high strength concrete and for pavements subjected to tension, is

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

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Q. The maximum percentage of chemical ingredient of cement is that of

  • (A) magnesium oxide
  • (B) iron oxide
  • (C) silica
  • (D) lime

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Q. The commercial name of white and coloured cement in India, is

  • (A) colorcrete
  • (B) silvicrete
  • (C) snowcem
  • (D) all the above

A

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Q. Increase in the moisture content in concrete

  • (A) reduces the strength
  • (B) increases the strength
  • (C) does not change the strength
  • (D) all of the above

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Q. The 28 days cube strength of mass concrete using aggregates of maximum size 5 cm for gravity dams should be

  • (A) between 150 to 300 kg/cm2
  • (B) between 350 to 600 kg/cm2
  • (C) between 150 to 500 kg/cm2
  • (D) below 200 kg/cm2

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Q. Select the incorrect statement

  • (A) lean mixes bleed more as compared to rich ones.
  • (B) bleeding can be minimized by adding pozzolana finer aggregate
  • (C) bleeding can be increased by addition of calcium chloride
  • (D) none of the above

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Q. Permissible compressive strength of M 150 concrete grade is

  • (A) 100 kg/cm2
  • (B) 150 kg/cm2
  • (C) 200 kg/cm2
  • (D) 250 kg/cm2

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Q. Curing a concrete for long period ensures better

  • (A) volume stability
  • (B) strength
  • (C) water resistance
  • (D) all the above

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Q. Batching error means inaccuracy in the quantity of

  • (A) aggregates
  • (B) cement
  • (C) water
  • (D) all the above

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Q. If the storey height is equal to length of RCC wall, the percentage increase in strength is

  • (A) 0
  • (B) 10
  • (C) 20
  • (D) 30

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