500 Best Concrete Technology- MCQ
Q49). In the manufacture of pozzolana cement, the amount of pozzolana material added to ordinary Portland cement clinkers is about
a).0.2
b).0.3
c).0.4
d).0.5
Correct Answer:
0.3
Explanation:
Q50). The degree of grinding of cement is called
a).fineness
b).soundness
c).impact value
d).bulking
Correct Answer:
fineness
Explanation:
Q51). The hardening is the phenomenon by virtue of which
a).the cement does not undergo large change in volume when treated with water
b).the plastic cement paste changes into hard mass
c).the cement paste sets and develops strength
d).none of the above
Correct Answer:
the cement paste sets and develops strength
Explanation:
Q52). The phenomenon by virtue of which the cement does not undergo large change in volume when treated with water, is known as
a).fineness
b).soundness
c).setting time
d).none of these
Correct Answer:
soundness
Explanation:
Q53). The fineness of cement is measured in terms of
a).percentage weight retained on IS sieve number 9
b).surface area in cm2 per gram of cement
c).either A or B
d).none of these
Correct Answer:
either A or B
Explanation:
Q54). Too much fineness of cement
a).results cracks in concrete
b).generates greater heat
c).develops early strength
d).both A and B
Correct Answer:
both A and B
Explanation:
Q55). The setting time of cement is the governing factor for
a).mixing of concrete
b).placing of concrete
c).compaction of concrete
d).all of these
Correct Answer:
all of these
Explanation:
Q56). The compressive strength of an ordinary portland cement standard cube after 7 days test should not be less than
a).11 N/mm2
b).17.5 N/mm2
c).22 N/mm2
d).27.5 N/mm2
Correct Answer:
17.5 N/mm2
Explanation: