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Civil Engineering Objective Questions { Concrete Technology }

113.  The ratio of various ingredients (cement, sand, aggregates) in concrete of grade M 200, is
A. 1 : 2 : 4
B. 1 : 3 : 6
C. 1 : 1: 2
D. 1 : 1 : 2

114. If the various concrete ingredients ie cement, sand and aggregates are in the ratio of 1 : 3 : 6, the grade of concrete, is
A. M 100
B. M 150
C. M 200
D. M 250

115. Pick up the incorrect statement from the following :
A. Workability of the concrete mix decreases with an increase in the moisture content
B. Concrete for which preliminary tests are conducted, is called controlled concrete
C. Bulking of sand depends upon the fineness of grains
D. All the above

116.  Shrinkage in concrete can be reduced by using
A. low water cement ratio
B. less cement in Concrete
C. proper concrete mix
D. all the above

117.  The 28 days cube strength of mass concrete using aggregates of maximum size 5 cm for gravity dams should be
A. between 150 to 300 kg/cm2
B. between 350 to 600 kg/cm2
C. between 150 to 500 kg/cm2
D. below 200 kg/cm2

118.  While designing an air entrained concrete
A. water cement ratio is reduced
B. proportion of aggregates is reduced
C. an allowance for the entrained air is made
D. all the above

119.  An ideal ware house, is provided
A. water proof masonry walls
B. water proof roof
C. few windows which remain generally closed
D. all the above

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