Civil Engineering - Building Materials

31. 

Pick up correct statement from the following:

A. Fibre boards are used for thermal and acoustic control
B. Fibre boards are used for light weight standing members
C. Fibre boards are obtained by impregnating a resin product on fibres
D. all the above.

Answer: Option D

Explanation:

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32. 

Quartzite, a metamorphic stone is

A. hard
B. brittle
C. crystalline
D. compact
E. All the above.

Answer: Option E

Explanation:

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33. 

Pick up the correct statement from the following:

A. Plastics have generally low melting point
B. The coefficient of thermal expansion of plastics is about three times than that of steel
C. The acoustical boards prepared by impregnating fibre-glass with phenolic resins has absorption coefficient of about 0.67
D. All the above.

Answer: Option D

Explanation:

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34. 

Dextrin is

A. animal glue
B. starch glue
C. albumin glue
D. rubber based adhesive
E. none to these.

Answer: Option D

Explanation:

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35. 

Formula for quick lime, is

A. CaCO3
B. CaO
C. CO3CO2
D. none to these.

Answer: Option B

Explanation:

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