Concrete Technology MCQs with answers Page - 39

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Q. The usual proportion of ingredients in reinforced cement concrete is

  • (A) Portland cement (1 part), clean sand (2 to 4 parts) and coarse aggregate (1 to 2 parts)
  • (B) Portland cement (1 part), clean sand (1 to 2 parts) and coarse aggregate (2 to 4 parts)
  • (C) Porland cement (1 part), clean sand and coarse aggregate (2 to 4 parts)
  • (D) any one of the above

A

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Q. Trowelling should be finished on the same day of its laying operation.

  • (A) Yes
  • (B) No
  • (C) ---
  • (D) ---

A

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Q. The continuous strain, which the concrete undergoes due to application of external loads, is called

  • (A) workability
  • (B) bleeding
  • (C) segregation
  • (D) creep

A

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Q. The development of first 28 days strength is on account of the hydration of

  • (A) dicalcium silicate
  • (B) tricalcium silicate
  • (C) tricalcium aluminate
  • (D) tetra calcium alumino ferrite

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Q. The resistance of an aggregate to the effect of hydration of cement and weather is called

  • (A) crushing value
  • (B) impact value
  • (C) abrasion value
  • (D) soundness

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Q. For reinforced cement concrete lintels and slabs, the nominal size of coarse aggregate should not exceed.

  • (A) 10 mm
  • (B) 15 mm
  • (C) 20 mm
  • (D) 40 mm

A

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Q. The slump whould not exceed 50 mm when compacting concrete with vibrators.

  • (A) Agree
  • (B) Disagree
  • (C) ---
  • (D) ---

A

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Q. The bulk density of an aggregate is the weight required to fill a container of unit volume.

  • (A) Agree
  • (B) Disagree
  • (C) ---
  • (D) ---

A

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Q. The process of hardening the concrete mixes by keeping its surface moist for a certain period called ?

  • (A) floating
  • (B) curing
  • (C) screeding
  • (D) none of these

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Q. The minimum quantity of cement to be used in controlled concrete is specified as ?

  • (A) 120 kg/cm³
  • (B) 160 kg/cm³
  • (C) 220 kg/cm²
  • (D) 280 kg/cm²

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