Building Materials
The compound of Portland cement which reacts immediately with water and also sets first is

Tri-calcium silicate
Tetra calcium alumino ferrite
Di-calcium silicate
Tri-calcium aluminate

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Building Materials
Pick up correct statement from the following:

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
All listed here

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