Civil Engineering - Building Materials

21. 

Wrought iron contains carbon about

A. 1.5% to 5.5%
B. 0.5% to 1.75%
C. 0.1% to 0.25%
D. none to these.

Answer: Option C

Explanation:

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22. 

The main constituent of fly-ash, is

A. aluminium oxide
B. silica
C. ferrous oxide
D. All of these.

Answer: Option D

Explanation:

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23. 

Bitumen in

A. solid state, is called asphalt
B. semi fluid state, is called mineral tar
C. fluid state, is called petroleum
D. all the above.

Answer: Option D

Explanation:

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24. 

The plastics made from cellulose resin

A. are as clear as glass
B. are tough and strong
C. possess excellent electrical properties
D. All the above.

Answer: Option D

Explanation:

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25. 

Kaolin is chemically classified as

A. metamorphic rock
B. argillaceous rock
C. calcareous rock
D. silicious rock.

Answer: Option B

Explanation:

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