Building Materials
A good brick earth should contain:

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

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Building Materials
Pick up correct statement from the following:

All listed here
Fibre boards are used for light weight standing members
Fibre boards are used for thermal and acoustic control
Fibre boards are obtained by impregnating a resin product on fibres

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