Civil Engineering - Building Materials

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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