Top 250+ Solved Concrete Technology MCQ Questions Answer
Q. The main object of compaction of concrete, is:
a. to eliminate air holes
b. to achieve maximum density
c. to provide intimate contact between the concrete and embedded materials
d. all the above
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. Log Angles machine is used to test the aggregate for
a. crushing strength
b. impact value
c. abrasion resistance
d. water absorption
Q. If the various concrete ingredients i.e. cement, sand and aggregates are in the ratio of 1:3:6, the grade of concrete, is
a. M 10
b. M 15
c. M 20
d. M 30
Q. Cement used for normal concrete construction, is obtained by burning a mixture of
a. silicious and argillaceous materials
b. argilaceous and calcareous materials
c. silicious and catcareous materials
d. silicious, argillaceous and calcareous materials
Q. In slump test, each layer of concrete is compacted by a steel rod 60 cm long and of 16 mm diameter for
a. 20 times
b. 25 times
c. 30 times
d. 40 times
Q. Efflorescence in cement is caused due to an excess of
a. alumina
b. iron oxide
c. silica
d. alkalis
Q. Slump test of concrete is a measure of its
a. consistency
b. compressive strength
c. tensile strength
d. impact value.
Q. Pick up the incorrect statement applicable to the field test of good cement.
a. When one thrusts one's hand into a bag of cement, one should feel warm
b. The colour of the cement is bluish
c. A handful of cement thrown into a bucket of water should sink immediately
d. All the above
Q. The most useless aggregate is one whose surface texture is
a. smooth
b. granular
c. glassy
d. honey combed and porous
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