100 Best Building Materials- Cement MCQ
Q17). For ensuring quality of concrete, use
a).single sized aggegates
b).two sized aggregate
c).graded aggregates
d).coarse aggregates
Correct Answer:
graded aggregates
Explanation:
Q18). According to I.S. : 456, the number of grades of concrete mixes, is
a).3
b).4
c).5
d).7
Correct Answer:
7
Explanation:
Q19). The mixture of different ingredients of cement, is burnt at
a).1000°C
b).1200°C
c).1400°C
d).1600°C
Correct Answer:
1400°C
Explanation:
Q20). The risk of segregation is more for
a).wetter mix
b).larger proportion of maximum size aggregate
c).coarser grading
d).all the above.
Correct Answer:
all the above.
Explanation:
Q21). After casting, an ordinary cement concrete on drying
a).expands
b).mix
c).shrinks
d).none of these.
Correct Answer:
shrinks
Explanation:
Q22). Hydration of cement is due to chemical action of water with
a).Tricalcium silicate and dicalcium silicate
b).Dicalcium silicate and tricalcium aluminate
c).Tricalcium aluminate and tricalcium alumino ferrite
d).All the above.
Correct Answer:
All the above.
Explanation:
Q23). To obtain cement dry powder, lime stones and shales or their slurry, is burnt in a rotary kiln at a temperature between
a).1100° and 1200°C
b).1200° and 1300°C
c).1300° and 1400°C
d).1400° and 1500°C
Correct Answer:
1400° and 1500°C
Explanation:
Q24). Permissible compressive strength of M 300 concrete grade is
a).100 kg/cm2
b).300 kg/cm2
c).150 kg/cm2
d).200 kg/cm2
Correct Answer:
300 kg/cm2
Explanation: