Concrete Technology MCQs with answers Page - 40

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Q. For compacting plain concrete or one-way reinforced concrete floors, the vibrator used is ?

  • (A) internal vibrator
  • (B) screed vibrator
  • (C) form vibrator
  • (D) all of these

A

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Q. The compressive strength of an ordinary Portland cement (1:3 cement mortar cube) after 7 days test should not be less than ?

  • (A) 11 N/mm²
  • (B) 17.5 N/mm²
  • (C) 22 N/mm²
  • (D) 27 N/mm²

A

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Q. The workability of concrete by slump test is expressed as ?

  • (A) minutes
  • (B) mm/h
  • (C) mm²/h
  • (D) mm

A

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Q. To perform the initial setting time test, the water is added to the cement at the rate of .............. by weight of cement ?

  • (A) 0.72 P
  • (B) 0.78 P
  • (C) 0.85 P
  • (D) 0.95 P

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Q. To prevent segregation, the concrete should not be thrown from a height of more than ?

  • (A) 1/2 m
  • (B) 1 m
  • (C) 1.5 m
  • (D) 2 m

A

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Q. To perform the compressive strength test of cement, water is added at the rate of ?

  • (A) 0.72 P+ 3% of water
  • (B) 0.85 P+ 4% of water
  • (C) P+ 3% of water
  • (D) P+ 4% of water

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Q. The concrete mix of grade M 25 means that the compressive strength of 15 cm cubes at 28 days after mixing is ?

  • (A) 15 N/mm²
  • (B) 20 N/mm²
  • (C) 25 N/mm²
  • (D) 30 N/mm²

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Q. The test conducted in the laboratory on the specimen made out of trial ?

  • (A) preliminary test
  • (B) slump test
  • (C) works test
  • (D) none of these

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Q. The sum of percentages of all deleterious materials in the aggregate shall not exceed ?

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

A

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Q. The maximum particle size of coarse aggregate is ?

  • (A) 45 mm
  • (B) 55 mm
  • (C) 65 mm
  • (D) 75 mm

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