Concrete Technology MCQs with answers Page - 45

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Q. According to IS:383-1970, a good aggregate for concrete construction should be ?

  • (A) chemically inert
  • (B) sufficiently strong
  • (C) sufficiently hard and durable
  • (D) all of these

A

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Q. Water-cement ratio is, usually, expressed in ?

  • (A) litres of water required per bag of cement
  • (B) litres of water required per kg of cement
  • (C) both (a) and (b)
  • (D) none of these

A

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Q. The minimum particle size of coarse aggregate is ?

  • (A) 2.5 mm
  • (B) 4.75 mm
  • (C) 5.85 mm
  • (D) 6.5 mm

A

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Q. The value of bulk density for angular and flaky aggregates is ............ as compared to graded aggregates ?

  • (A) same
  • (B) less
  • (C) more
  • (D) none

A

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Q. The presence of calcium chloride in water ?

  • (A) accelerates setting of cement
  • (B) de-accelerates hardening of cement
  • (C) causes little effect on quality of concrete
  • (D) all of these

A

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Q. Which of the following statement is wrong ?

  • (A) The coarse sand produces a harsh and unworkable mix
  • (B) An admixture cannot increase the workability of concrete without increasing water content
  • (C) Salts of manganese cause a considerable reduction in the strength of concrete
  • (D) all of the above

A

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Q. Which of the following statement is correct ?

  • (A) Larger the size of coarse aggregate, lesser is the quantity of fine aggregate and of cement required
  • (B) If very dry aggregates are used, the workability of the mix is likely to be reduced
  • (C) Bulking is caused due to the formation of thin film of surface moisture around the sand particles
  • (D) all of the above

A

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Q. When the sand is fully saturated, its volume is ........ the volume of dry and loose sand ?

  • (A) equal to
  • (B) less than
  • (C) more than
  • (D) none of these

A

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Q. The deleterious materials present in the aggregate ?

  • (A) prevent normal hydration of cement
  • (B) reduce the strength and durability of concrete
  • (C) modify the setting action and cause efflorescence
  • (D) all of the above

A

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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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