Civil Engineering - Building Materials
Exercise :: Building Materials - Section 1
26. |
Which one of the following is acid resistant asbestos: |
A. |
actinolite asbestos | B. |
amosite asbestos | C. |
anthophylite asbestos | D. |
crocidolite asbestos | E. |
All the above. |
Answer: Option E
Explanation:
|
27. |
Due to attack of dry rot, the timber |
A. |
cracks | B. |
shrinks | C. |
reduces to powder | D. |
none of these. |
Answer: Option C
Explanation:
|
28. |
Brittleness of cold is due to an excess of |
A. |
sulphur | B. |
carbon | C. |
phosphorus | D. |
silicon. |
Answer: Option C
Explanation:
|
29. |
For the manufacture of Portland cement, the proportions of raw materials used, are |
A. |
lime 63% ; silica 22% ; other ingredients 15% | B. |
lime 22% ; silica 63% ; other ingredients 15% | C. |
silica 40% ; lime 40% ; other ingredients 20% | D. |
silica 70% ; lime 20% ; other ingredients 10%. |
Answer: Option A
Explanation:
|
30. |
Asbestos cement |
A. |
is brittle | B. |
warps due to changes in humidity | C. |
strength is lowered when saturated by water | D. |
all the above. |
Answer: Option D
Explanation:
|