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Building Materials

Building Materials
Which of the following metamorphic rocks has the most weather resisting characteristics?

Marble
Slate
Lime stone
Quartzite

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Building Materials
Softer variety of steel may be obtained by

Open hearth process
Crucible process
Cementation process
Bessemer process

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Building Materials
A good brick earth should contain:

Not more than 5% of lime
About 20% to 30% of alumina
About 50% to 60% of silica
All listed here

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Building Materials
Which of the following stresses is used for identifying the quality of structural steel?

Ultimate stress
None of these
Proof stress
Yield stress

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Building Materials
Crushing strength of a first class brick should not be less than

10.5 N/mm²
14.0 N/mm²
7.0 N/mm²
3.5 N/mm²

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Building Materials
Red short iron cracks when bent due to the presence of

Carbon
Phosphorus
Silicon
Sulphur

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