Concrete Technology MCQs with answers Page - 23

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Q. The light-weight concrete is prepared by

  • (A) mixing Portland cement with sawdust in specified proportion in the concrete
  • (B) using coke-breeze, cinder or slag as aggregate in the concrete
  • (C) mixing aluminium in the concrete
  • (D) none of tha above

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Q. For compacting plain concrete or one-way reinforced concrete floors, the vibrator used is

  • (A) internal vibrator
  • (B) screed vibrator
  • (C) form vibrator
  • (D) all of these

A

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Q. The surface moisture of aggregates increases the water-cement ratio in the mix and thus

  • (A) increases
  • (B) decreases
  • (C) ---
  • (D) ---

A

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Q. For compacting large sections of mass concrete in structures, the type of vibrator used is

  • (A) internal vibrator
  • (B) screed vibrator
  • (C) both (a) and (b)
  • (D) either (a) or (b)

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Q. The presence of

  • (A) sodium carbonate and bicarbonate
  • (B) calcium chloride
  • (C) sodium chloride
  • (D) sodium sulphate

A

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Q. The tetra calcium alumino ferrite in cement has

  • (A) good
  • (B) poor
  • (C) ---
  • (D) ---

A

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Q. For reinforced concrete, the aggregate used is

  • (A) sand
  • (B) gravel
  • (C) crushed rock
  • (D) all of these

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Q. The steel mould used for slump test is in the form of a

  • (A) cube
  • (B) cylinder
  • (C) frustrum of a cone
  • (D) none of these

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Q. In order to avoid segregation, the concrete should not be thrown from a height.

  • (A) Agree
  • (B) Disagree
  • (C) ---
  • (D) ---

A

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Q. Water cement ratio may be defined as the ratio of

  • (A) volume of water to that of cement in a concrete mix
  • (B) weight of water to that of cement in a concrete mix
  • (C) volume of water to that of concrete in a concrete mix
  • (D) weight of water to that of concrete in a concrete mix

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