Building Materials
Cast iron

All listed here
Is obtained by purifying pig iron
Is manufactured in required shapes
May contain 2 to 5 per cent of carbon with other impurities

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Building Materials
Asbestos

Contains iron oxide and alumina
Is a natural fibrous mineral substance
All of these
Is composed of hydrous silicates of calcium and magnesium (CaSiO3, 3MgSiO3)

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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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