Civil Engineering - Building Materials

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:

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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:

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28. 

Brittleness of cold is due to an excess of

A. sulphur
B. carbon
C. phosphorus
D. silicon.

Answer: Option C

Explanation:

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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:

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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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