Top 350+ Solved Concrete Technology and Design MCQ Questions Answer
Q. For a longitudinal reinforcing bar in a column, the minimum cover shall neither be less than thediameter of bar nor less than
a. 15 mm
b. 25 mm
c. 30 mm
d. 40 mm
Q. Workability of concrete is measured by
a. vicat apparatus test
b. slump test
c. minimum void method
d. talbot richard test
Q. The main reason for providing number of reinforcing bars at a support in a simply supported beamis to resist in that zone
a. compressive stress
b. shear stress
c. bond stress
d. tensile stress
Q. The entrained air in concrete
a. increases workability
b. decreases workability
c. decreases resistance to weathering
d. increases strength
Q. According to IS: 4561978, the flexural strength of concrete is
a. directly proportional to compressive strength
b. inversely proportional to compressive strength
c. directly proportional to square root of compressive strength
d. inversely proportional to square root of compressive strength
Q. Di-calcium silicate (C2S)
a. hydrates rapidly
b. generates less heat of hydration
c. hardens rapidly
d. provides less ultimate strength to cement
Q. The limits of percentage p of the longitudinal reinforcement in a column is given by
a. 0.15% to 2%
b. 0.8% to 4%
c. 0.8% to 6%
d. 0.8% to 8%
Q. The risk of segregation is more for
a. wetter mix
b. larger proportion of maximum size aggregate
c. coarser grading
d. all the above
Q. Le-Chatelier's apparatus is used for testing
a. soundness of cement
b. hardness of cement
c. strength of cement
d. durability of cement
Q. Construction joints are generally provided in concrete
a. roads
b. retaining walls
c. lining of canals
d. all the above
Q. If a grading curve is horizontal between the portions of 20 mm I.S. Sieve and 4.75 mm I.S. Sieve,the graded aggregates do not contain
a. 20 mm particles
b. 10 mm particles
c. 4.75 mm particles
d. all the above
Q. Most common method of pre-stressing used for factory production is
a. long line method
b. freyssinet system
c. magnel-blaton system
d. lee-macall system
Q. C.R.R.I. charts are used to obtain a relationship between strength of concrete and
a. water cement ratio
b. workability
c. grading of aggregate
d. fineness modulus