Concrete Technology MCQs with answers Page - 71

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Q. Most common method of pre-stressing used for factory production is

  • (A) long line method
  • (B) freyssinet system
  • (C) magnel-blaton system
  • (D) lee-macall system

A

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Q. C.R.R.I. charts are used to obtain a relationship between strength of concrete and

  • (A) water cement ratio
  • (B) workability
  • (C) grading of aggregate
  • (D) fineness modulus

A

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Q. For the design of retaining walls, the minimum factor of safety against overturning is taken as

  • (A) 1.5
  • (B) 2.0
  • (C) 2.5
  • (D) 3.0

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Q. If the depth of moist sand in a cylinder is 15 cm and the depth of the sand when fully inundated with water is 12 cm, the bulking of the moist sand, is

  • (A) 10 %
  • (B) 12 %
  • (C) 15 %
  • (D) 25 %

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Q. If the foundations of all the columns of a structure are designed on the total live and dead load basis, then

  • (A) there will be no settlement of columns
  • (B) there will be no differential settlement
  • (C) the settlement of exterior columns will be more than interior columns
  • (D) the settlement of interior columns will be more than exterior columns

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Q. Saw dust can be rendered chemically inert by boiling it in water containing

  • (A) ferrous sulphate
  • (B) potassium chloride
  • (C) ammonia
  • (D) nitric acid

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Q. A concrete having a slump of 6.5 cm, is said to be

  • (A) dry
  • (B) earth moist
  • (C) semi-plastic
  • (D) plastic

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Q. To obtain a very high strength concrete, use very fine grained

  • (A) granite
  • (B) magnetite
  • (C) barite
  • (D) volcanic scoria

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Q. Vicat apparatus is used for

  • (A) fineness test
  • (B) consistency test
  • (C) test for setting time
  • (D) test for tensile strength

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Q. Permissible compressive strength of M 200 concrete grade is

  • (A) 100 kg/cm2
  • (B) 150 kg/cm2
  • (C) 200 kg/cm2
  • (D) 250 kg/cm2

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