Building Materials
When a brick is immersed in water for 24 hours and then dried, if

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

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Building Materials
Pick up correct statement from the following:

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

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