Concrete Technology MCQs with answers Page - 79

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Q. According to Water-Cement Ratio Law, the strength of workable plastic concrete

  • (A) depends upon the amount of water used in the mix
  • (B) does not depend upon the quality of cement mixed with aggregates
  • (C) does not depend upon the quantity of cement mixed with aggregates
  • (D) all the above

A

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Q. Sands of zone I are:

  • (A) course
  • (B) medium
  • (C) medium to fine
  • (D) fine

A

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Q. The condition not applicable to water cement ratio law, is

  • (A) internal moisture conditions on hydration continue till complete strength is gained
  • (B) concrete specimens may be tested at any temperature
  • (C) concrete specimens need be of same age
  • (D) concrete specimens need be of same size

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Q. If the slump of a concrete mix is 60 mm, its workability is

  • (A) very low
  • (B) low
  • (C) medium
  • (D) high

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Q. Cube strength of controlled concrete to be used for pre-tensioned and post-tensioned work respectively should not be less than

  • (A) 35 mpa and 42 mpa
  • (B) 42 mpa and 35 mpa
  • (C) 42 mpa and 53 mpa
  • (D) 53 mpa and 42 mpa

A

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Q. The void ratio of

  • (A) single size coarse aggregate is roughly 0.45
  • (B) graded coarse aggregate is roughly 0.040
  • (C) fine aggregate is roughly 0.45
  • (D) all the above

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Q. According to IS : 382-1963, a good aggregate should be

  • (A) chemically inert
  • (B) sufficiently strong
  • (C) hard and durable
  • (D) all the above

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Q. The compressive strength of 100 mm cube as compared to 150 mm cube is always

  • (A) less
  • (B) more
  • (C) equal
  • (D) none of the above

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Q. The diameter of the Vicat plunger is 10 mm and its length varies from

  • (A) 20 mm to 30 mm
  • (B) 30 mm to 40 mm
  • (C) 40 mm to 50 mm
  • (D) 50 mm to 60 mm

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Q. If the effective plan area of a warehouse is 54 sq. m, and maximum height of piles permitted is 270 cm, the number of cement bags to be stored, is

  • (A) 2000 bags
  • (B) 2200 bags
  • (C) 2400 bags
  • (D) 2700 bags

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