Building Materials
Slacking of lime is affected by

Crushing the lime lumps
Keeping it exposed to air
None of these
Immersing the lime in water

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Building Materials
Pick up correct statement from the following:

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

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Building Materials
Asbestos

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

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