Top 350+ Solved Concrete Technology and Design MCQ Questions Answer
Q. The top diameter, bottom diameter and the height of a slump mould are:
a. 10 cm, 20 cm, 30 cm
b. 10 cm, 30 cm, 20 cm
c. 20 cm, 10 cm, 30 cm
d. 20 cm, 30 cm, 10 cm
Q. Which of the following has high tensile strength?
a. plain hot rolled wires
b. cold drawn wires
c. heat treated rolled wires
d. all have same tensile strength
Q. Concrete gains strength due to
a. chemical reaction of cement with sand and coarse aggregates
b. evaporation of water from concrete
c. hydration of cement
d. all the above
Q. To determine the modulus of rupture, the size of test specimen used is
a. 150 × 150 × 500 mm
b. 100 × 100 × 700 mm
c. 150 × 150 × 700 mm
d. 100 × 100 × 500 mm
Q. Tricalcium aluminate (C3A)
a. reacts fast with water
b. generates less heat of hydration
c. causes initial setting and early strength of cement
d. does not contribute to develop ultimate strength
Q. If the various concrete ingredients i.e. cement, sand and aggregates are in the ratio of 1:3:6, thegrade of concrete, is
a. m 100
b. m 150
c. m 200
d. m 250
Q. Admixtures which cause early setting and hardening of concrete are called
a. workability admixtures
b. accelerators
c. retarders
d. air entraining agents
Q. Pick up the incorrect statement from the following:
a. admixtures accelerate hydration
b. admixtures make concrete water proof
c. admixtures make concrete acid proof
d. admixtures give high strength
Q. For a reinforced concrete section, the shape of shear stress diagram is
a. wholly parabolic
b. wholly rectangular
c. parabolic above neutral axis and rectangular below neutral axis
d. rectangular above neutral axis and parabolic below neutral axis
Q. Allowable shear strength of concrete, depends upon
a. shear strength
b. tensile strength
c. compressive strength
d. none of these
Q. In slump test, each layer of concrete is compacted by a steel rod 60 cm long and of 16 mmdiameter for
a. 20 times
b. 25 times
c. 30 times
d. 50 times
Q. The individual variation between test strength of sample should not be more than
a. ±5 % of average
b. ± 10 % of average
c. ± 15 % of average
d. ±20 % of average
Q. Pick up the incorrect statement from the following:
a. concrete for which preliminary tests are conducted, is called controlled concrete
b. bulking of sand depends upon the fineness of grains
c. concrete mix 1 : 6 : 12, is used for mass concrete in piers
d. all the above
Q. The slab is designed as one way if the ratio of long span to short span is
a. less than 1
b. between 1 and 1.5
c. between 1.5 and 2
d. greater than 2
Q. For the construction of cement concrete dams, the maximum permissible size of the aggregates, is
a. 40 mm
b. 50 mm
c. 60 mm
d. 70 mm