Concrete Technology MCQs with answers Page - 64

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A

Admin • 833.24K Points
Coach

Q. In case of hand mixing of concrete, the extra cement to be added is

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

A

Admin • 833.24K Points
Coach

Q. If 1500 g of water is required to have a cement paste 1875 g of normal consistency, the percentage of water is,

  • (A) 20 %
  • (B) 25 %
  • (C) 30 %
  • (D) 35 %

A

Admin • 833.24K Points
Coach

Q. The percentage of voids in cement is approximately

  • (A) 25 %
  • (B) 40 %
  • (C) 60 %
  • (D) 80 %

A

Admin • 833.24K Points
Coach

Q. Water required per bag of cement, is

  • (A) 7 kg
  • (B) 14 kg
  • (C) 21 kg
  • (D) 35 kg

A

Admin • 833.24K Points
Coach

Q. The recommended value of modular ratio for reinforced brick work is

  • (A) 18
  • (B) 30
  • (C) 40
  • (D) 58

A

Admin • 833.24K Points
Coach

Q. For an ordinary Portland cement

  • (A) residual does not exceed 10% when sieved through is sieve no. 9
  • (B) soundness varies from 5 to 10 mm
  • (C) initial setting time is not less than 30 minutes
  • (D) compressive stress after 7 days, is not less than 175 kg/cm2

A

Admin • 833.24K Points
Coach

Q. The ratio of the diameter of reinforcing bars and the slab thickness is

  • (A) 1/4
  • (B) 1/5
  • (C) 1/6
  • (D) 1/8

A

Admin • 833.24K Points
Coach

Q. Pozzolana cement is used with confidence for construction of

  • (A) dams
  • (B) massive foundations
  • (C) r.c.c. structures
  • (D) all the above

A

Admin • 833.24K Points
Coach

Q. The operation of removing humps and hollows of uniform concrete surface, is known as

  • (A) floating
  • (B) screeding
  • (C) trowelling
  • (D) finishing

A

Admin • 833.24K Points
Coach

Q. 1% of voids in a concrete mix would reduce its strength by about

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

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