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:

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

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

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Building Materials
The thermosetting plastic

Becomes rigid when moulded at suitable pressure and temperature
Chars at 343°C
All listed here
At 127°C to 177°C permanently set and further application of heat does not soften it

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