Top 350+ Solved Concrete Technology and Design MCQ Questions Answer
Q. An aggregate is known as cyclopean aggregate if its size is more than
a. 4.75 mm
b. 30 mm
c. 60 mm
d. 75 mm
Q. Workability of concrete mix with low water cement ratio is determined by
a. tensile strength test
b. slump test
c. compaction factor test
d. flexural strength test
Q. The effect of creep on modular ratio is
a. to decrease it
b. to increase it
c. either to decrease or to increase it
d. to keep it unchanged
Q. The type of aggregates not suitable for high strength concrete and for pavements subjected totension, is
a. rounded aggregate
b. irregular aggregate
c. angular aggregate
d. flaky aggregate
Q. The maximum percentage of chemical ingredient of cement is that of
a. magnesium oxide
b. iron oxide
c. silica
d. lime
Q. The commercial name of white and coloured cement in India, is
a. colorcrete
b. silvicrete
c. snowcem
d. all the above
Q. An excess of flaky particles in concrete aggregates
a. decreases the workability
b. increases the quantity of water and sand
c. more than 15% are not desirable
d. all the above
Q. Increase in the moisture content in concrete
a. reduces the strength
b. increases the strength
c. does not change the strength
d. all of the above
Q. The 28 days cube strength of mass concrete using aggregates of maximum size 5 cm for gravitydams 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
Q. Select the incorrect statement
a. lean mixes bleed more as compared to rich ones.
b. bleeding can be minimized by adding pozzolana finer aggregate
c. bleeding can be increased by addition \of calcium chloride
d. none of the above
Q. Permissible compressive strength of M 150 concrete grade is
a. 100 kg/cm2
b. 150 kg/cm2
c. 200 kg/cm2
d. 250 kg/cm2
Q. Cement used for normal concrete construction, is obtained by burning a mixture of
a. siliceous and argillaceous materials
b. argillaceous and calcareous materials
c. siliceous and calcareous materials
d. siliceous, argillaceous and calcareous materials
Q. As compared to ordinary Portland cement, high alumina cement has
a. higher initial setting time but lower final setting time
b. lower initial setting time but higher final setting time
c. higher initial and final setting times
d. lower initial and final setting times
Q. The maximum amount of dust which may be permitted in aggregates is
a. 5% of the total aggregates for low workability with a coarse grading
b. 10% of the total aggregates for low workability with a fine grading
c. 20% of the total aggregates for a mix having high workability with fine grading
d. all the above
Q. Bulking of sand is
a. mixing of different sizes of sand particles
b. mixing of lime with sand
c. maximum water with sand
d. swelling of sand when wetted