Concrete Technology MCQs with answers Page - 43

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Q. The water used for ordinary concrete is equal to 5% by weight of aggregate plus ....... by weight of cement ?

  • (A) 10%
  • (B) 20%
  • (C) 30%
  • (D) 40%

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Q. The slump test of concrete is used to measure ?

  • (A) consistency
  • (B) mobility
  • (C) homogeneity
  • (D) all of these

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Q. For reinforced cement concrete lintels and slabs, the nominal size of coarse aggregate should not exceed ?

  • (A) 10 mm
  • (B) 15 mm
  • (C) 20 mm
  • (D) 40 mm

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Q. The-concrete can be lifted by pumps through a maximum vertical distance of ?

  • (A) 10 m
  • (B) 20 m
  • (C) 30 m
  • (D) 50 m

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Q. The internal friction between the ingredients of concrete is minimised by ?

  • (A) adopting coarse aggregates
  • (B) using more water
  • (C) reducing the surface area
  • (D) all of these

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Q. The apparent specific gravity of an aggregate is defined as ?

  • (A) the weight of oven dry aggregate divided by its absolute volume, excluding the natural pores in the aggregate particles
  • (B) the weight of oven dry aggregate divided by its absolute volume, including the natural pores in the aggregate particles
  • (C) the weight of aggregate required to fill a container of unit volume
  • (D) the difference in weight of the aggregate in saturated surface dry condition and in moist condition

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Q. The usual proportion of ingredients in plain cement concrete is ?

  • (A) Portland cement (1 part), clean sand (1 and 1/2 to 8 parts) and coarse aggregate (3 to 16 parts)
  • (B) Portland cement (1 part), clean sand (3 to 16 parts) and coarse aggregate (1 and 1/2 to 8 parts)
  • (C) Portland cement (1 part), clean sand and coarse aggregate (1 and 1/2 to 8 parts)
  • (D) any one of the above

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Q. The main requirement, which a ware-house should fulfil is that ?

  • (A) its walls should be water proof masonry construction
  • (B) its roof should be leak
  • (C) it must have large number of windows
  • (D) its plinth should be very high

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Q. Which of the following statement is correct ?

  • (A) Harshness in concrete mix increases if finer aggregates to fill the voids in coarse aggregates are less
  • (B) As the internal friction of aggregates increases, the workability of concrete decreases
  • (C) As the slump value increases, the workability of concrete also increases
  • (D) all of the above

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Q. The mixer, which produces a steady stream of concrete as long as it is in operation, is known as ?

  • (A) non-tilling batch mixer
  • (B) tilting type batch mixer
  • (C) continuous mixer
  • (D) none of these

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