Concrete Technology MCQs with answers Page - 53

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Q. Plain cement concrete is strong in taking ?

  • (A) tensile stress
  • (B) compressive stress
  • (C) shear stress
  • (D) all of these

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Q. If the proportions of different ingredients (cement, sand and aggregate) are in the ratio of 1:2:4, then the grade of concrete is ?

  • (A) M 10
  • (B) M 15
  • (C) M 20
  • (D) M 25

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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. Segregation in concrete results in ?

  • (A) honey combing
  • (B) porous layers
  • (C) surface scaling
  • (D) all of these

A

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Q. Calcareous material used in the manufacture of cement consists of ?

  • (A) lime stone
  • (B) chalk
  • (C) shells
  • (D) all of these

A

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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. Workability of concrete mix having very low water-cement ratio should be obtained by ?

  • (A) flexural strength test
  • (B) slump test
  • (C) compaction factor test
  • (D) any one of these

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Q. The value of bulk density of the aggregate depends upon ?

  • (A) size distribution of aggregate
  • (B) shape of aggregate
  • (C) specific gravity of aggregate
  • (D) all of these

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Q. The resistance of an aggregate to compressive forces is known as ?

  • (A) crushing value
  • (B) impact value
  • (C) abrasion value
  • (D) none of these

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Q. The concrete in which no preliminary tests are performed for designing the mix is called ?

  • (A) rich concrete
  • (B) controlled concrete
  • (C) lean concrete
  • (D) all the seven grades of concrete mix

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