Top 350+ Solved Concrete Technology and Design MCQ Questions Answer
Q. Pick up the incorrect statement from the following:
a. a rich mix of concrete possesses higher strength than that a lean mix of desired workability with excessive quantity of water
b. the strength of concrete decreases as the water cement ratio increases
c. good compaction by mechanical vibrations, increases the strength of concrete
d. none of these
Q. Ordinary Portland cement is manufactured from
a. lime stone and clay
b. gypsum and lime
c. pozzolana
d. lime, pozzolana and clay
Q. The percentage of reinforcement in case of slabs, when high strength deformed bars are used isnot less than
a. 0.15
b. 0.12
c. 0.30
d. 1.00
Q. Addition of pozzolana to cement
a. decreases workability
b. increases strength
c. increases heat of hydration
d. none of these
Q. The minimum cover to the ties or spirals should not be less than
a. 15 mm
b. 20 mm
c. 25 mm
d. 50 mm
Q. According to Water-Cement Ratio Law, the strength of workable plastic concrete
a. depends upon the amount of water used in the mix
b. does not depend upon the quality of cement mixed with aggregates
c. does not depend upon the quantity of cement mixed with aggregates
d. all the above
Q. According to Whitney's theory, ultimate strain of concrete is assumed to be
a. 0.03 %
b. 0.1 %
c. 0.3 %
d. 3 %
Q. The condition not applicable to water cement ratio law, is
a. internal moisture conditions on hydration continue till complete strength is gained
b. concrete specimens may be tested at any temperature
c. concrete specimens need be of same age
d. concrete specimens need be of same size
Q. Cube strength of controlled concrete to be used for pre-tensioned and post-tensioned workrespectively should not be less than
a. 35 mpa and 42 mpa
b. 42 mpa and 35 mpa
c. 42 mpa and 53 mpa
d. 53 mpa and 42 mpa
Q. The void ratio of
a. single size coarse aggregate is roughly 0.45
b. graded coarse aggregate is roughly 0.040
c. fine aggregate is roughly 0.45
d. all the above
Q. According to IS : 382-1963, a good aggregate should be
a. chemically inert
b. sufficiently strong
c. hard and durable
d. all the above
Q. The compressive strength of 100 mm cube as compared to 150 mm cube is always
a. less
b. more
c. equal
d. none of the above