Concrete Technology MCQ – Aggregate MCQ

111. Admixtures which cause early setting and hardening of concrete are called as

  1. workability admixture
  2. super plasticizers
  3. accelerators
  4. retarders
Answer. c

112. When the cement content and workability are kept constant, the greater proportion of fine aggregate will be required if

  1. maximum size of aggregate is larger
  2. maximum size of aggregate is small
  3. all in aggregate is used
  4. rounded coarse aggregate is used
Answer. b

113. Most chemically active concrete aggregate a from

  1. sedimentary rock
  2. igneous rock
  3. sand stones
  4. metamorphic rock
Answer. b

114. The most commonly used admixture to accelerate the setting time of concrete is which of the following?

  1. Gypsum
  2. Calcium chloride
  3. Calcium Sulphate
  4. Silica fumes
Answer. b

115. Which of the following is not a workability enhancing agent ?

  1. Air entraining agents
  2. Plasticizer
  3. Super plasticizer
  4. Silica fumes
Answer. d

116. Which of the following aggregate should not be used in the manufacture of concrete as it exhibits alkali-aggregate reaction?

  1. Granite
  2. Basalt
  3. Limestone
  4. All of these
Answer. c

117. Fine aggregates are those which pass and retain on these IS sieves respectively. Their sizes are

  1. 6 mm and 75 μm
  2. 4.75 mm and 75 μm
  3. 75 μm and 4.75 mm
  4. 10 mm and 4.75 mm
Answer. b

118. The workability of concrete by Vee-Bee test is expressed in

  1. cm
  2. cm/s
  3. percentage
  4. seconds
Answer. d

119. The most commonly used admixture which increases the workability of concrete is called as

  1. plasticizers
  2. retarders
  3. accelerators
  4. air-entraining agents
Answer. a

120. The water cement ratio is expressed by

  1. based on volume of materials
  2. based on weight of materials
  3. based on density of materials
  4. based on percentage of materials used
Answer. b
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