Concrete Technology MCQs with answers Page - 26

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Q. The sound absorption coefficient of light weight concrete is nearly

  • (A) twice
  • (B) three times
  • (C) four times
  • (D) six times

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Q. The construction joints in cement concrete

  • (A) should be located where bending moment is large
  • (B) should be located where shear force is large
  • (C) should not be provided at the corners
  • (D) should be spaced at a distance of 3 m apart in case of huge structures

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Q. During field test, the cement is said to be pure and of good quality when

  • (A) the colour of cement is uniformly greenish grey
  • (B) a handful of cement, thrown into a bucket of water, floats
  • (C) hand is thrusted into a bag of cement, it feels cool
  • (D) all of the above

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Q. A good concrete should have minimum thermal expansion.

  • (A) Yes
  • (B) No
  • (C) ---
  • (D) ---

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Q. Workability of concrete mix having very low water-cement ratio should be obtained by

  • (A) flexural strength test
  • (B) slump test
  • (C) compaction factor test
  • (D) any one of these

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Q. The process of removing the irregularities from the surface of concrete left after screeding is called floating.

  • (A) Correct
  • (B) Incorrect
  • (C) ---
  • (D) ---

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Q. Each layer of concrete placed in the mould, in preliminary test, is compacted 25 times with a 20 mm diameter rod and 60 cm in length

  • (A) Right
  • (B) Wrong
  • (C) ---
  • (D) ---

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Q. "Colocrete" is the commercial term for

  • (A) high alumina cement
  • (B) coloured cement
  • (C) low heat cement
  • (D) rapid hardening cement

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Q. In transportation of concrete by pumps

  • (A) the slump should not be less than 50 mm and more than 80 mm
  • (B) the water cement ratio should remain between 0.5 to 0.65
  • (C) the number of bends in a pipe line should be as small as possible
  • (D) all of the above

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Q. When the batching of material is done by weight

  • (A) the bucket in which the material is to be weighed should be cleaned thoroughly
  • (B) the weighing machine should be levelled before placing the material
  • (C) the chart should be prepared indicating the weight of each material used for different strengths of concrete
  • (D) all of the above

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