Concrete Technology MCQs with answers Page - 34

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Q. Pezzolana is essentially a silicious material containing clay upto

  • (A) 20%
  • (B) 40%
  • (C) 60%
  • (D) 80%

A

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Q. The resistance of an aggregate to sudden compressive forces is called impact value.

  • (A) Correct
  • (B) Incorrect
  • (C) ---
  • (D) ---

A

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Q. The controlled concrete is used for

  • (A) one grade of concrete mix
  • (B) three grades of concrete mix
  • (C) five grades of concrete mix
  • (D) all the seven grades of concrete mix

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Q. The admixtures are added in concrete to

  • (A) accelerate the rate of setting and hardening of cement
  • (B) make the concrete water proof, acid proof etc.
  • (C) reduce the bleeding and segregation of concrete mix
  • (D) all of the above

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Q. The aggregate is said to be elongated when

  • (A) its least dimension is three-fifth of its mean dimension
  • (B) its least dimension is equal to its mean dimension
  • (C) its length is equal to its mean dimension
  • (D) its length is equal to 1.8 times its mean dimension

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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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Q. The cement, widely used in retaining walls, is

  • (A) rapid hardening cement
  • (B) low heat cement
  • (C) sulphate resisting cement
  • (D) ordinary Portland cement

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Q. The presence of tricalcium silicate in cement

  • (A) hydrates the cement rapidly
  • (B) generates less heat of hydration
  • (C) offers high resistance to sulphate attack
  • (D) all of these

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Q. If sea water is used for preparing concrete mix, it

  • (A) reduces strength
  • (B) corrodes steel reinforcement
  • (C) causes efflorescence
  • (D) all of these

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Q. Vibrated concrete needs

  • (A) less
  • (B) high
  • (C) ---
  • (D) ---

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