Concrete Technology MCQs with answers Page - 66

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Q. A concrete using an air entrained cement

  • (A) has strength less than 10% to 15%
  • (B) has more resistance to weathering
  • (C) is more plastic and workable
  • (D) is free from segregation and bleeding

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Q. A beam curved in plan is designed for

  • (A) bending moment and shear
  • (B) bending moment and torsion
  • (C) shear and torsion
  • (D) bending moment, shear and torsion

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Q. High carbon content in the steel causes

  • (A) decrease in tensile strength but increase in ductility
  • (B) increase in tensile strength but decrease in ductility
  • (C) decrease in both tensile strength and ductility
  • (D) increase in both tensile strength and ductility

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Q. Particles of 0.002 mm size are that of

  • (A) clay
  • (B) sand
  • (C) gravel
  • (D) none of these

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Q. Ultimate strength of cold drawn high steel wires

  • (A) increases with increase in diameter of bar
  • (B) decreases with increase in diameter of bar
  • (C) does not depend on diameter of bar
  • (D) none of the above

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Q. The cement whose strength is a little lower than the ordinary cement during the first three months but attains afterwards the same strength, is known as

  • (A) low-heat portland cement
  • (B) rapid hardening portland cement
  • (C) portland blast slag cement
  • (D) portland pozzolana cement

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Q. The dimensions of a 35 litre forma for measuring aggregates by volume, are:

  • (A) length 30 cm, breadth 25 cm, height 30 cm
  • (B) length 39 cm, breadth 25 cm, height 32 cm
  • (C) length 27 cm, breadth 27 cm, height 48 cm
  • (D) length 220 cm, breadth 25 cm, height 40 cm

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Q. Ratio of permissible stress in direct compression and bending compression is

  • (A) less than 1
  • (B) between 1 and 1.5
  • (C) between 1.5 and 2.0
  • (D) greater than 2

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Q. Concrete containing

  • (A) siliceous aggregates, has higher co-efficient of expansion
  • (B) igneous aggregates, has intermediate coefficient of expansion
  • (C) lime stones, has lowest co-efficient of expansion
  • (D) all the above

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Q. The lower water cement ratio in concrete, introduces

  • (A) smaller creep and shrinkage
  • (B) greater density and smaller permeability
  • (C) improved frost resistance
  • (D) all the above

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