Concrete Technology MCQs with answers Page - 67

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Q. In T-shaped R C. retaining walls, the main reinforcement in the stem is provided on

  • (A) the front face in one direction
  • (B) the front face in both directions
  • (C) the inner face in one direction
  • (D) the inner face in both directions

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Q. The aggregate containing moisture in pores and having its surface dry, is known as

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

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Q. According to ISI recommendations, the maximum depth of stress block for balanced section of a beam of effective depth d is

  • (A) 0.43 d
  • (B) 0.55 d
  • (C) 0.68 d
  • (D) 0.85 d

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Q. Pick up the correct proportions of chemical ingredients of cement

  • (A) lime : silica : alumina : iron oxide : 63 : 22 : 6 : 3
  • (B) silica : lime : alumina : iron oxide : 63 : 22 : 6 : 3
  • (C) alumina : silica : lime : iron oxide : 63 : 22 : 6 : 3
  • (D) iron oxide : alumina : silica : lime : 63 : 22 : 6 : 3

A

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Q. Internal friction between the ingredients of concrete, is decreased by using

  • (A) less water
  • (B) fine aggregates
  • (C) rich mix
  • (D) more water and coarse aggregates

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Q. Modulus of elasticity of steel as per IS: 4561978 shall be taken as

  • (A) 20 kn/cm²
  • (B) 200 kn/cm²
  • (C) 200 kn/mm²
  • (D) 2 × 106 n/cm²

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Q. The grade of concrete M 150 means that compressive strength of a 15 cm cube after 28 days, is

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

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Q. The cement becomes useless if its absorbed moisture content exceeds

  • (A) 1 %
  • (B) 2 %
  • (C) 3 %
  • (D) 5 %

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Q. In reinforced concrete footing on soil, the minimum thickness at edge should not be less than

  • (A) 100 mm
  • (B) 150 mm
  • (C) 200 mm
  • (D) 250 mm

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Q. For preparing a test-specimen, it is necessary

  • (A) to mix cement and fine aggregate by dry hand
  • (B) to mix coarse aggregates
  • (C) to mix water to the cement, fine aggregates and coarse aggregates
  • (D) all the above

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