Concrete Technology MCQs with answers Page - 84

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Q. To determine the modulus of rupture, the size of test specimen used is

  • (A) 150 × 150 × 500 mm
  • (B) 100 × 100 × 700 mm
  • (C) 150 × 150 × 700 mm
  • (D) 100 × 100 × 500 mm

A

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Q. Tricalcium aluminate (C3A)

  • (A) reacts fast with water
  • (B) generates less heat of hydration
  • (C) causes initial setting and early strength of cement
  • (D) does not contribute to develop ultimate strength

A

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Q. Admixtures which cause early setting and hardening of concrete are called

  • (A) workability admixtures
  • (B) accelerators
  • (C) retarders
  • (D) air entraining agents

A

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Q. For a reinforced concrete section, the shape of shear stress diagram is

  • (A) wholly parabolic
  • (B) wholly rectangular
  • (C) parabolic above neutral axis and rectangular below neutral axis
  • (D) rectangular above neutral axis and parabolic below neutral axis

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Q. Allowable shear strength of concrete, depends upon

  • (A) shear strength
  • (B) tensile strength
  • (C) compressive strength
  • (D) none of these

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Q. The individual variation between test strength of sample should not be more than

  • (A) ±5 % of average
  • (B) ± 10 % of average
  • (C) ± 15 % of average
  • (D) ±20 % of average

A

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Q. The slab is designed as one way if the ratio of long span to short span is

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

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Q. For the construction of cement concrete dams, the maximum permissible size of the aggregates, is

  • (A) 40 mm
  • (B) 50 mm
  • (C) 60 mm
  • (D) 70 mm

A

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Q. To hydrate 500kg of cement full water needed, is

  • (A) 100 kg
  • (B) 110 kg
  • (C) 120 kg
  • (D) 130 kg

A

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Q. In a counterfort retaining wall, the main reinforcement in the stem at mid span is provided on

  • (A) front face only
  • (B) inner face only
  • (C) both front face and inner face
  • (D) none of the above

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