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:
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