Concrete Technology MCQs with answers Page - 70

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Admin • 833.24K Points
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Q. The size of fine aggregates does not exceed

  • (A) 2.75 mm
  • (B) 3.00 mm
  • (C) 3.75 mm
  • (D) 4.75 mm

A

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Q. The main reason for providing number of reinforcing bars at a support in a simply supported beam is to resist in that zone

  • (A) compressive stress
  • (B) shear stress
  • (C) bond stress
  • (D) tensile stress

A

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Q. The entrained air in concrete

  • (A) increases workability
  • (B) decreases workability
  • (C) decreases resistance to weathering
  • (D) increases strength

A

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Q. According to IS: 4561978, the flexural strength of concrete is

  • (A) directly proportional to compressive strength
  • (B) inversely proportional to compressive strength
  • (C) directly proportional to square root of compressive strength
  • (D) inversely proportional to square root of compressive strength

A

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Q. Slump test is done for

  • (A) clay
  • (B) sand
  • (C) lime
  • (D) concrete

A

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Q. Di-calcium silicate (C2S)

  • (A) hydrates rapidly
  • (B) generates less heat of hydration
  • (C) hardens rapidly
  • (D) provides less ultimate strength to cement

A

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Q. The limits of percentage p of the longitudinal reinforcement in a column is given by

  • (A) 0.15% to 2%
  • (B) 0.8% to 4%
  • (C) 0.8% to 6%
  • (D) 0.8% to 8%

A

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Q. The risk of segregation is more for

  • (A) wetter mix
  • (B) larger proportion of maximum size aggregate
  • (C) coarser grading
  • (D) all the above

A

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Q. Construction joints are generally provided in concrete

  • (A) roads
  • (B) retaining walls
  • (C) lining of canals
  • (D) all the above

A

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Q. If a grading curve is horizontal between the portions of 20 mm I.S. Sieve and 4.75 mm I.S. Sieve, the graded aggregates do not contain

  • (A) 20 mm particles
  • (B) 10 mm particles
  • (C) 4.75 mm particles
  • (D) all the above

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