Civil Engineering - Building Materials

26. 

Inhaling of fly-ash over a long period causes

A. silicosis
B. fibrosis of lungs
C. bronchitis
D. pneumonitis
E. All of these.

Answer: Option E

Explanation:

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27. 

Minimum required water cement ratio for a workable concrete, is

A. 0.30
B. 0.40
C. 0.50
D. 0.60
E. 1.0.

Answer: Option B

Explanation:

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28. 

Rocks formed due to alteration of original structure due to heat and excessive pressure are called

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

Answer: Option C

Explanation:

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29. 

The compound of Portland cement which contributes to the strength after two to three years is

A. Tricalcium silicate
B. Di-calcium silicate
C. Tricalcium aluminate
D. Tetracalcium alumino ferrite.

Answer: Option B

Explanation:

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30. 

For slaking of 10 kg of CaO, the theoretical amount of water is

A. 2.2 kg
B. 1.5 kg
C. 3.2 kg
D. None of these.

Answer: Option C

Explanation:

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