Top 350+ Solved Concrete Technology and Design MCQ Questions Answer
Q. For the construction of the retaining structures, the type of concrete mix to be used, is
a. 1 : 3 : 6
b. 1 : 2 : 4
c. 1 : 1½ : 3
d. 1 : 4 : 8
Q. The produce impermeable concrete
a. thorough mixing of concrete is required
b. proper compaction of concrete is required
c. proper curing of concrete is required
d. all the above
Q. If fineness modulus of sand is 2.5, it is graded as
a. very fine sand
b. fine sand
c. medium sand
d. coarse sand
Q. Maximum quantity of water needed per 50 kg of cement for M 15 grade of concrete is
a. 28 liters
b. 30 liters
c. 32 liters
d. 34 liters
Q. The increased cohesiveness of concrete, makes it
a. less liable to segregation
b. more liable to segregation
c. more liable to bleeding
d. more liable for surface scaling in frosty weather
Q. Concrete is unsuitable for compaction by a vibrator if it is
a. dry
b. earth moist
c. semi-plastic
d. plastic
Q. In order to obtain the best workability of concrete, the preferred shape of aggregate is
a. rounded
b. elongated
c. angular
d. all of the above
Q. Hydration of cement is due to chemical action of water with
a. tricalcium silicate and dicalcium silicate
b. dicalcium silicate and tricalcium aluminate
c. tricalcium aluminate and tricalcium alumino ferrite
d. all the above
Q. An aggregate which passes through 25 mm I.S. sieve and is retained on 20 mm sieve, is said to beflaky if its least dimension is less than
a. 22.5 mm
b. 18.5 mm
c. 16.5 mm
d. 13.5 mm
Q. For quality control of Portland cement, the test essentially done is
a. setting time
b. tensile strength
c. consistency
d. all the above
Q. Strength of concrete with passage of time
a. increases
b. decreases
c. fluctuates
d. remains constant
Q. Which of the following statements is incorrect?
a. higher vee-bee time shows lower workability
b. higher slump shows higher workability
c. higher compacting factor shows higher workability
d. none of the above