Concrete Technology MCQs with answers Page - 55

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Q. The concrete in which preliminary tests are performed for designing the mix is called ?

  • (A) rich concrete
  • (B) controlled concrete
  • (C) lean concrete
  • (D) ordinary concrete

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Q. For high degree of workability, the compaction factor is ?

  • (A) 0.65
  • (B) 0.75
  • (C) 0.85
  • (D) 0.95

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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. The fineness modulus of an aggregate is roughly proportional to ?

  • (A) specific gravity of the aggregate
  • (B) shape of the aggregate
  • (C) average size of particles in the aggregate
  • (D) grading of the aggregate

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Q. The maximum particle size of fine aggregate is ?

  • (A) 2.5 mm
  • (B) 4.75 mm
  • (C) 5.85 mm
  • (D) 6.5 mm

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Q. The levelling operation that removes humps and hollows and give a true, uniform concrete surface is called ?

  • (A) screeding
  • (B) floating
  • (C) trowelling
  • (D) compacting

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Q. Which of the following statement is correct ?

  • (A) The maximum size of coarse aggregate should not exceed one-fourth of the minimum dimension of the plain concrete member
  • (B) The maximum size of coarse aggregate should not exceed one-fifth of the minimum dimension of the reinforced concrete member
  • (C) The aggregates of 40 mm, 20 mm and 10 mm sizes are commonly used for concrete works
  • (D) all of the above

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Q. According to IS: 269-1976, the requirement of an ordinary Portland cement is that ?

  • (A) the residue does not exceed 10% when sieved through IS sieve No. 9
  • (B) its expansion is not more than 10 mm for unrated cement
  • (C) its initial setting time is not less than 30 minutes
  • (D) all of the above

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Q. A compaction factor of 0.88 indicates that the workability of concrete mix is ?

  • (A) very low
  • (B) low
  • (C) medium
  • (D) high

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Q. Blast furnace slag cement is used for ?

  • (A) dams
  • (B) bridge abutments
  • (C) retaining walls
  • (D) all of these

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