Concrete Technology MCQs with answers Page - 52

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Q. When float of an activity is negative ?

  • (A) it represents a situation where extra resources are available and the completion of project is not delayed
  • (B) it represents that a programme falls behind schedule and additional resources are required to complete the project in time
  • (C) the activity is critical and any delay in its performance will delay the completion of whole project
  • (D) all of the above

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Q. An aggregate having all the pores filled with water but having dry surface is called ?

  • (A) very dry aggregate
  • (B) dry aggregate
  • (C) saturated surface dry aggregate
  • (D) moist aggregate

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Q. The development of first 28 days strength is on account of the hydration of ?

  • (A) dicalcium silicate
  • (B) tricalcium silicate
  • (C) tricalcium aluminate
  • (D) tetra calcium alumino ferrite

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Q. Bulking of sand is ?

  • (A) compacting of sand
  • (B) segregating sand of particular size
  • (C) increase in volume of sand due to presence of moisture upto certain extent
  • (D) none of the above

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Q. "Colocrete" is the commercial term for ?

  • (A) high alumina cement
  • (B) coloured cement
  • (C) low heat cement
  • (D) rapid hardening cement

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Q. The presence of ............. in water has an adverse effect on the setting time of cement ?

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

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Q. For mass concrete in piers and abutments, the grade of concrete mix used, is ?

  • (A) 1:1:2
  • (B) 1:15:3
  • (C) 1:2:4
  • (D) 1:3:6

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Q. The fineness of cement is measured in terms of ?

  • (A) percentage weight retained on IS sieve number 9
  • (B) surface area in cm² per gram of the cement
  • (C) either (a) or (b)
  • (D) none of these

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Q. Under normal circumstances, the beam soffits may be removed after ?

  • (A) 2 days
  • (B) 7 days
  • (C) 14 days
  • (D) 21 days

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Q. The proportion of lime, silica, alumina and iron oxide in a good Portland cement should be ?

  • (A) 63:22: 6:3
  • (B) 63:22:3:6
  • (C) 22:63:6:3
  • (D) 22:63:3:6

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