Concrete Technology MCQs with answers Page - 65

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Q. For a continuous slab of 3 m × 3.5 m size, the minimum overall depth of slab to satisfy vertical deflection limits is

  • (A) 50 mm
  • (B) 75 mm
  • (C) 100 mm
  • (D) 120 mm

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Q. The shrinkage of concrete

  • (A) is proportional to water content is the mix
  • (B) is proportional to cement concrete
  • (C) increases with age of concrete
  • (D) all the above

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Q. The maximum thickness of concrete floor of a cement warehouse, is

  • (A) 10 cm
  • (B) 15 cm
  • (C) 20 cm
  • (D) 25 cm

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Q. Too wet concrete may cause

  • (A) weakness of concrete
  • (B) excessive laitance
  • (C) segregation
  • (D) all the above

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Q. Maximum percentage reinforcement in case of slabs is limited to

  • (A) 2
  • (B) 4
  • (C) 6
  • (D) 8

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Q. The commonly used material in the manufacture of cement is

  • (A) sand stone
  • (B) slate
  • (C) lime stone
  • (D) graphite

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Q. According to I.S. : 456, the number of grades of concrete mixes, is

  • (A) 3
  • (B) 4
  • (C) 5
  • (D) 7

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Q. For the construction of thin R.C.C. structures, the type of cement to be avoided, is

  • (A) ordinary portland cement
  • (B) rapid hardening cement
  • (C) low heat cement
  • (D) blast furnace slag cement

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Q. Which of the following R.C. retaining walls is suitable for heights beyond 6 m?

  • (A) l-shaped wall
  • (B) t-shaped wall
  • (C) counterfort type
  • (D) all of the above

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Q. For batching 1:3:6 concrete mix by volume, the ingredients required per bag of 50 kg cement, are:

  • (A) 70 litres of sand and 120 litres of aggregates
  • (B) 70 kg of sand and 140 litres of aggregates
  • (C) 105 litres of sand and 140 litres of aggregates
  • (D) 105 litres of sand and 210 litres of aggregates

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