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Civil Engineering - Building Materials

Exercise : Building Materials - Section 7
11.
The method of addition polymerization is used for obtaining:
polythylene
polypropylene
polyvinylchloride
polystyrene
All of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
12.
Pick up the correct statement from the following:
The lime in excess makes the cement unsound and causes the cement to expand and disintegrate
The silica in excess makes the cement stronger but its setting time also increases
The excess amount of alumina weakens the cement
The addition of gypsum increases the initial setting time of cement
All the above.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
13.
A rock contains only one mineral. It is called
homogeneous
non-homogeneous
monomineralic
polymineralic.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
14.
Asbestos
is a natural fibrous mineral substance
is composed of hydrous silicates of calcium and magnesium (CaSiO3, 3MgSiO3)
contains iron oxide and alumina
all the above.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
15.
Pegmatite is a/an
intrusive igneous rock
extrusive igneous rock
sedimentary rock
metamorphic rock.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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