Top 350+ Solved Concrete Technology and Design MCQ Questions Answer
Q. Pick up the incorrect statement from the following:
a. with passage of time, the strength of cement increases
b. with passage of time, the strength of cement decreases
c. after a period of 24 months, the strength of cement reduces to 50%
d. the concrete made with storage deteriorated cement, gains strength with time
Q. Pick up the correct statement from the following:
a. a highly absorptive aggregate reduces the workability of concrete considerably
b. the specific gravity of aggregate is important for the determination of the moisture content
c. the absorption and porosity of an aggregate influence the property of the concrete
d. all the above
Q. In a counterfort retaining wall, the main reinforcement in the stem at mid span is provided on
a. front face only
b. inner face only
c. both front face and inner face
d. none of the above
Q. Under normal conditions using an ordinary cement, the period of removal of the form work, is:
a. 7 days for beam soffits
b. 14 days for bottom slabs of spans 4.6 m and more
c. 21 days for bottom beams over 6 m spans
d. all the above
Q. Water cement ratio is generally expressed in volume of water required per
a. 10 kg
b. 20 kg
c. 30 kg
d. 50 kg
Q. To ensure constant moisture content in aggregates
a. area of each aggregate pile should be large
b. height of each aggregate pile should not exceed 1.50 m
c. aggregate pile should be left for 24 hours before aggregates are used
d. all the above
Q. The average permissible stress in bond for plain bars in tension is
a. increased by 10% for bars in compression
b. increased by 25% for bars in compression
c. decreased by 10% for bars in compression
d. decreased by 25% for bars in compression
Q. For the construction of thin R.C.C. structures, the type of cement to be avoided, is
a. ordinary portland cement
b. rapid hardening cement
c. low heat cement
d. blast furnace slag cement
Q. Which of the following R.C. retaining walls is suitable for heights beyond 6 m?
a. l-shaped wall
b. t-shaped wall
c. counterfort type
d. all of the above
Q. For batching 1:3:6 concrete mix by volume, the ingredients required per bag of 50 kg cement, are:
a. 70 litres of sand and 120 litres of aggregates
b. 70 kg of sand and 140 litres of aggregates
c. 105 litres of sand and 140 litres of aggregates
d. 105 litres of sand and 210 litres of aggregates
Q. A concrete using an air entrained cement
a. has strength less than 10% to 15%
b. has more resistance to weathering
c. is more plastic and workable
d. is free from segregation and bleeding
Q. Pick up the correct statement from the following:
a. segregation is necessary for a workable concrete
b. consistency does not affect the workability of concrete
c. if the concrete mix is dry, the slump is maximum
d. none of these
Q. The surface where two successive placements of concrete meet, is known as
a. contraction joint
b. expansion joint
c. construction joint
d. both (a) and (b)