Civil Engineering - Building Materials

21. 

To give a brilliant finish, the type of varnish used, is

A. water varnish
B. spirit varnish
C. turpentine varnish
D. oil varnish
E. none of these.

Answer: Option B

Explanation:

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22. 

Pick up the correct statement from the following:

A. Bull's trench kiln a trench excavated in ground
B. Hoffman's kiln is constructed overground
C. Tunnel Kiln is constructed as a tunnel
D. All the above.

Answer: Option D

Explanation:

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23. 

The softest rock is

A. marble
B. diamond
C. talc
D. quartz.

Answer: Option C

Explanation:

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24. 

Bitumen may be dissolved in

A. carbondioxide
B. water
C. sodium chloride
D. carbon disulphide
E. none of these.

Answer: Option D

Explanation:

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25. 

Pick up the correct statement from the following:

A. Rusting is caused due to combined action of air, moisture and carbon dioxide
B. During rusting, first ferrous bicarbonates are formed
C. On further oxidation ferrous bicarbonates get converted to ferric bicarbonates
D. Ultimately hydrated ferric oxide is formed during rusting and carbon dioxide gets liberated
E. All the above.

Answer: Option E

Explanation:

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