Concrete Technology MCQs with answers Page - 5

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Q. Pozzolanic properties exist in

  • (A) shales
  • (B) fly ash
  • (C) pumicite
  • (D) all the above

A

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Q. Workability improved by adding

  • (A) fly ash
  • (B) hydrated lime
  • (C) calcium chloride
  • (D) all the above

A

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Q. If the various concrete ingredients i.e. cement, sand and aggregates are in the ratio of 1:3:6, the grade of concrete, is

  • (A) M 10
  • (B) M 15
  • (C) M 20
  • (D) M 30

A

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Q. For proper mixing about…………. revolution are required.

  • (A) 40 to 50
  • (B) 30 to 40
  • (C) 15 to 20
  • (D) 25 to 30

A

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Q. The process of mixing, transporting, placing and compacting concrete should not take more than ……. min any case.

  • (A) 90
  • (B) 80
  • (C) 70
  • (D) 60

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Q. Commonly use retarders is……

  • (A) Calcium sulphate
  • (B) Sugars
  • (C) Cellulose products.
  • (D) All of the above

A

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Q. The main object of compaction of concrete, is:

  • (A) to eliminate air holes
  • (B) to achieve maximum density
  • (C) to provide intimate contact between the concrete and embedded materials
  • (D) All the above

A

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Q. The setting time of cement is the governing factor for

  • (A) mixing of concrete
  • (B) placing of concrete
  • (C) compaction of concrete
  • (D) all of these

A

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Q. Bulk specific gravity of an aggregate is defined as

  • (A) the weight of oven dry aggregate divided by its absolute volume, excluding the natural pores in the aggregate particles
  • (B) the weight of oven dry aggregate divided by its absolute volume, including the natural pores in the aggregate particles
  • (C) the weight of aggregate required to fill a container of unit volume
  • (D) the difference in weight of the aggregate in saturated surface dry condition and in moist condition

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