Concrete Technology MCQs with answers Page - 60

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Q. In making precast structural units for partition and wall lining purposes, the concrete should be ?

  • (A) sawdust concrete
  • (B) air-entrained concrete
  • (C) light-weight concrete
  • (D) vacuum concrete

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Q. The hardening is the phenomenon by virtue of which ?

  • (A) the cement does not undergo large change in volume when treated with water
  • (B) the plastic cement paste changes into hard mass
  • (C) the cement paste sets and develops strength
  • (D) none of the above

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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

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Q. The importance of batching is to obtain ?

  • (A) strength
  • (B) workability
  • (C) durability
  • (D) all of these

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Q. The strength and durability of concrete depends upon ?

  • (A) size of aggregates
  • (B) grading of aggregates
  • (C) moisture contents of aggregates
  • (D) all of these

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Q. The continuous strain, which the concrete undergoes due to application of external loads, is called ?

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

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Q. Reinforced cement concrete is equally strong in taking ?

  • (A) tensile and compressive stresses
  • (B) compressive and shear stresses
  • (C) tensile, compressive and shear stresses
  • (D) tensile and shear stresses

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Q. Initial setting time of ordinary Portland cement is ?

  • (A) 15 min
  • (B) 30 min
  • (C) 60 min
  • (D) 10h

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Q. The gypsum is added to the cement for ?

  • (A) providing high strength to the cement
  • (B) controlling the initial setting time of cement
  • (C) lowering the clinkering temperature
  • (D) all of the above

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Q. A suitable admixture added at the time of preparing the concrete ?

  • (A) water-proof
  • (B) acid proof
  • (C) highly strong
  • (D) all of these

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