Top 250+ Solved Concrete Technology MCQ Questions Answer
Q. Placing of concrete should preferably be done at a temperature of
a. 0°C
b. 10°C
c. 20°C
d. 27 ± 2°C
Q. The aggregate impact value of the aggregate used in
a. building concrete is less than 45
b. road pavement concrete is less than 30
c. runway concrete is less than 30
d. all the above.
Q. On a grading curve, the gap grading is represented by
a. a horizontal line
b. a vertical line
c. N.W. inclined line
d. N.E. inclined line
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
Q. Curing of pavements, floors, roofs and slabs, is done by
a. membrane method
b. ponding method
c. covering surface with bags
d. sprinkling water method
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. 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)
Q. An excess of flaky particles in concrete aggregates
a. decreases the workability
b. increases the quantity of water and sand
c. affects the durability of concrete
d. all the above
Q. I.S.I. has specified the full strength of concrete after
a. 7 days
b. 14 days
c. 21 days
d. 28 days
Q. The minimum percentage of chemical ingredient of cement is that of
a. magnesium oxide
b. iron oxide
c. alumina
d. lime
Q. The specifications of a cement bag for storage, are
a. weight 50 kg
b. height 18 cm
c. plan area 3000 sq. cm
d. all the above
Q. The concrete mix which causes difficulty in obtaining a smooth finish, possess
a. segregation
b. internal friction
c. harshness
d. bleeding
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