Concrete Technology MCQs with answers Page - 28

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Q. The compaction factor is the ratio of weight of partially compacted concrete to the weight of fully compacted concrete.

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

A

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Q. If the proportions of different ingredients (cement, sand and aggregate) are in the ratio of 1 : 2 : 4, then the grade of concrete is

  • (A) M 10
  • (B) M 15
  • (C) M 20
  • (D) M 25

A

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Q. The rule of water cement ratio was established by

  • (A) Duff Abram
  • (B) Plowman
  • (C) W. Simms
  • (D) Dr. Karl Terzaghi

A

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Q. The impact value of an aggregate is generally used as an alternative to its crushing value, to know the quality of aggregate.

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

A

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Q. The workability of concrete is expressed by

  • (A) water-cement ratio
  • (B) slump value
  • (C) compaction factor
  • (D) both (a) and (b)

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Q. The sum of the percentage of tricalcium silicate and dicalcium silicate for Portland cement varies from

  • (A) 50 to 60%
  • (B) 60 to 70%
  • (C) 70 to 80%
  • (D) 80 to 90%

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Q. The percentage of water for making a cement paste of normal consistency varies from

  • (A) 15 to 25%
  • (B) 25 to 35%
  • (C) 35 to 50%
  • (D) 50 to 60%

A

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Q. Vertical sides of columns may be stripped after

  • (A) 1 to 2 days
  • (B) 7 days
  • (C) 14 days
  • (D) 21 days

A

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Q. Rapid hardening cement is used

  • (A) where high early strength is desired
  • (B) where form work is to be removed as early as possible
  • (C) for constructing road pavements
  • (D) all of the above

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Q. If 30% excess water is added, the strength of concrete is reduced by

  • (A) 30%
  • (B) 40%
  • (C) 50%
  • (D) 60%

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