Concrete Technology MCQs with answers Page - 21

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Q. The compressive strength of an ordinary Portland cement (1 : 3 cement mortar cube) after 7 days test should not be less than

  • (A) 11 N/mm2
  • (B) 17.5 N/mm2
  • (C) 22 N/mm2
  • (D) 27.5 N/mm2

A

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Q. If mineral oil is present in mixing water for concrete, it increases strength for a concentration upto 2 percent.

  • (A) Yes
  • (B) No
  • (C) ---
  • (D) ---

A

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Q. Concrete with higher compaction factor has less workability.

  • (A) True
  • (B) False
  • (C) ---
  • (D) ---

A

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Q. The aggregates of

  • (A) irregular
  • (B) angular
  • (C) rounded
  • (D) flaky

A

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Q. The Indian standard code specifies that the crushing strength for which the mix should be designed in the laboratory should be

  • (A) 1.25
  • (B) 1.5
  • (C) 2
  • (D) 2.5

A

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Q. For batching 1 : 2 : 4 concrete mix by volume, the ingredients required per bag of cement are

  • (A) 50 kg of cement : 70 kg of fine aggregate : 140 kg of coarse aggregate
  • (B) 50 kg of cement : 70 litres of fine aggregate : 140 litres of coarse aggregate
  • (C) 50 kg of cement : 100 kg of fine aggregate : 200 kg of coarse aggregate
  • (D) 50 kg of cement : 100 litres of fine aggregate : 200 litres of coarse aggregate

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Q. For heat and sound insulation purposes, we shall use

  • (A) vacuum concrete
  • (B) air-entrained concrete
  • (C) saw dust concrete
  • (D) both (b) and (c)

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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. Which cement is used for works economic where considerations is predominant? Reservoirs, retaining walls, swimming pools, dams, bridges, piers etc.

  • (A) Waterproof Portland Cement
  • (B) Colored Cement
  • (C) High Alumina Cement
  • (D) Blast Furnace Slag Cement

A

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Q. How many times in each layer of concrete rodded in a slump cone?

  • (A) 75
  • (B) 25
  • (C) 12 to 15
  • (D) 35 to 65

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