Building Materials
Pick up correct statement from the following:

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Fibre boards are used for light weight standing members
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
When a brick is immersed in water for 24 hours and then dried, if

All listed here
50 percent surface is covered with grey or white deposits, the brick has serious efflorescence
10 percent surface is covered with grey or white deposits, the brick has slight efflorescence
No grey or white deposits appear on the surface, the brick is free from soluble salts

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