Concrete Technology MCQ – Aggregate MCQ

91. For a given environment, the most significant factor that influences the total shrinkage of concrete is

  1. Cement content in mix
  2. Total amount of water added at the time of mixing
  3. Size of the member concreted
  4. Maximum size of the coarse aggregates
Answer. b

92. The behavior of concrete under instantaneous load is

  1. elastic
  2. plastic
  3. anelastic
  4. viscoelastic
Answer. a

93. Self-compacting concrete is characterized by

  1. high powder component
  2. high water-powder ratio
  3. cementations materials upto 30%
  4. rough surface finish
Answer. a

94. The Ph value of water used for mixing and curing of concrete shall NOT be less than

  1. 5
  2. 6
  3. 7
  4. 8
Answer. b

95. For a beam of cross sectional size 100 mm × 200 mm, the nominal maximum size of coarse aggregate should NOT be greater than

  1. 10 mm
  2. 20 mm
  3. 25 mm
  4. 40 mm
Answer. c

96. What is the limiting value of Los Angeles abrasion value (in%) for wearing courses when these aggregates are to be used for concrete making?

  1. 40
  2. 30
  3. 35
  4. 45
Answer. b

97. Which of the following is NOT be used in concrete either as a binding material or as supplementary cementitious material?

  1. Fly ash
  2. Portland slag cement
  3. Gypsum
  4. Micro silica
Answer. c

98. Dorry abrasion test registered a loss in weight of 27 g. The respective coefficient of hardness will be

  1. 8
  2. 9
  3. 10
  4. 11
Answer. d

99. As the fineness modulus of aggregate increases its particle size

  1. increases
  2. decreases
  3. remains same
  4. none of these
Answer. a

100. Proneness to segregation of fresh concrete is cured better tested by

  1. Slump test
  2. Flow test
  3. Vee Bee test
  4. Compaction factor test
Answer. b
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