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Building Materials

Building Materials
The variety of pig iron used for manufacture of wrought iron, is

White forge pig
Mottled pig
Grey or foundry pig
Bessemer pig

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Building Materials
The coefficient of hardness of stones used in road work should be greater than

15
12
17
10

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Building Materials
A good brick earth should contain:

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

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

Metamorphic rocks
Sedimentary rocks
Igneous rocks
None of these

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Building Materials
Plastics are compounds of carbon with element

All of these
Hydrogen
Nitrogen
Oxygen

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Building Materials
Addition of pozzolana to ordinary Portland cement increases

Heat of hydration
Shrinkage
Permeability
Bleeding

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