Concrete Technology MCQs with answers Page - 15

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Q. For continuous transportation of concrete, the method used is

  • (A) transport of concrete by pans
  • (B) transport of concrete by wheel barrows
  • (C) transport of concrete by belt concrete conveyors
  • (D) transport of concrete by pumps

A

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Q. The function of aggregates in concrete is to serve as

  • (A) binding material
  • (B) filler
  • (C) catalyst
  • (D) all of these

A

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Q. The breaking up of cohesion in a mass of concrete is called

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

A

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Q. The Vee-Bee test is suitable for concrete mixes of low and very low workabilities.

  • (A) True
  • (B) False
  • (C) ---
  • (D) ---

A

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Q. The aggregate which pass through 4.75 mm IS sieve and entirely retain on 75 micron IS sieve is called

  • (A) cyclopean aggregate
  • (B) coarse aggregate
  • (C) fine aggregate
  • (D) all-in-aggregate

A

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Q. Efflorescence in cement is caused due to the excess of

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

A

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Q. Which of the following grade is not recommended by IS 456-1978?

  • (A) M 10
  • (B) M 20
  • (C) M 40
  • (D) M 55

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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. Ferro-concrete is another name given to

  • (A) plain cement concrete
  • (B) reinforced cement concrete
  • (C) prestressed cement concrete
  • (D) none of these

A

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Q. The use of air-entraining agents in concrete

  • (A) increases workability of concrete
  • (B) decreases bleeding
  • (C) decreases strength
  • (D) all of these

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