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Building Materials

Building Materials
Initial setting time of cement for asbestos cement products should be not less than

90 minutes
30 minutes
75 minutes
50 minutes

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Building Materials
The ratio of the thickness of web to that of flange of steel rolled structural beams and channels is

Less than 1
Equal to 1
Less than 1 in beams but greater than 1 in channels
Greater than 1

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

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

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Building Materials
The standard size of masonry bricks, is

20 cm x 10 cm x 10 cm
21 cm x 11 cm x 11 cm
19 cm x 9 cm x 9 cm
18 cm x 8 cm x 8 cm

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Building Materials
For the manufacture of Portland cement, the proportions of raw materials used, are

Silica 70% ; lime 20% ; other ingredients 10%
Lime 22% ; silica 63% ; other ingredients 15%
Silica 40% ; lime 40% ; other ingredients 20%
Lime 63% ; silica 22% ; other ingredients 15%

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Building Materials
The moisture content in a well seasoned timber is

4 % to 6 %
15 % to 20 %
10 % to 12 %
100 %

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