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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