Civil Engineering - Building Materials

31. 

Gniess is obtained from

A. igneous rocks
B. metamorphic rocks
C. sedimentary rocks
D. sedimentary metamorphic rocks.

Answer: Option D

Explanation:

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32. 

The rocks formed by gradual deposition, are called

A. sedimentary rocks
B. igneous rocks
C. metamorphic rocks
D. none of these.

Answer: Option A

Explanation:

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33. 

Galvanising means covering iron with a thin coat of

A. tin
B. zinc
C. glaze
D. coal tar.

Answer: Option B

Explanation:

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34. 

For preparing porcelains, the clay should be

A. sufficiently pure
B. of high degree of tanacity
C. of good plasticity
D. All the above.

Answer: Option D

Explanation:

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35. 

Polymerization helps to improve the property of

A. strength
B. rigidity
C. elasticity
D. all of these.

Answer: Option D

Explanation:

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