Building Materials
Assertion A : Pure lime takes a long time to develop adequate strength.Reason R : Pure lime has slow hardening characteristics.Select your answer according to the coding system given below:

Both A and R is true and R is not a correct explanation of A
A is true but R is false
A is false but R is true
Both A and R is true and R is correct explanation of A

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Building Materials
Pick up correct statement from the following:

All listed here
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

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