Civil Engineering - Building Materials
Exercise :: Building Materials - Section 7
| 11. |
The method of addition polymerization is used for obtaining: |
| A. |
polythylene | | B. |
polypropylene | | C. |
polyvinylchloride | | D. |
polystyrene | | E. |
All of these. |
Answer: Option E
Explanation:
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| 12. |
Pick up the correct statement from the following: |
| A. |
The lime in excess makes the cement unsound and causes the cement to expand and disintegrate | | B. |
The silica in excess makes the cement stronger but its setting time also increases | | C. |
The excess amount of alumina weakens the cement | | D. |
The addition of gypsum increases the initial setting time of cement | | E. |
All the above. |
Answer: Option E
Explanation:
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| 13. |
A rock contains only one mineral. It is called |
| A. |
homogeneous | | B. |
non-homogeneous | | C. |
monomineralic | | D. |
polymineralic. |
Answer: Option C
Explanation:
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| 14. |
Asbestos |
| A. |
is a natural fibrous mineral substance | | B. |
is composed of hydrous silicates of calcium and magnesium (CaSiO3, 3MgSiO3) | | C. |
contains iron oxide and alumina | | D. |
all the above. |
Answer: Option D
Explanation:
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| 15. |
Pegmatite is a/an |
| A. |
intrusive igneous rock | | B. |
extrusive igneous rock | | C. |
sedimentary rock | | D. |
metamorphic rock. |
Answer: Option A
Explanation:
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