Building Materials
Excess of alumina in brick earth makes the brick

Brittle and weak
To crack and warp on drying
Impermeable
To lose cohesion

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Building Materials
Acrylic sheets

Are generally unaffected by most household detergents
All of these
Possess the light transmission rate of 93%
Possess 10 to 17 times greater breakage resistance than that of glass of equivalent thickness

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Building Materials
Pick up correct statement from the following:

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

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