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Building Materials

Building Materials
The proportions of lime and sand in the mortar normally used in brick construction are

1 : 2
1 : 8
1 : 6
1 : 4

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Building Materials
Three basic raw materials which are needed in large quantities for production of steel are

Iron ore, coal and lime stone
Iron ore, coal and sulphur
Iron ore, carbon and sulphur
Iron ore, carbon and lime stone

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Building Materials
A good brick earth should contain:

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

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Building Materials
Plaster of Paris is obtained by calcining

Gypsum
Bauxite
Lime stone
None of these

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Building Materials
The slag which floats on the surface of the molten iron generally contains

Alumina (Al2O3) 12% and MgO, CaSO4, KMnO2 and FeO 8%
Silica (SiO2) 35%
Lime (CaO) 45%
All listed here

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Building Materials
Which one of the following is used for preparing porcelain?

Quartz
All of these
Feldspar
Clay

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