Building Materials
For obtaining vinyl chloride acetate, the method used, is

Condensation polymerization
Addition polymerization
None of these
Co-polymerization

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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 correct explanation of A
A is false but R is true
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
Sapwood consists of

Thin layers below the bark
Innermost annular rings around the pith
Thin fibre which extends from the pith outwards and holds the annular rings together
Portion of timber between heartwood and cambium layer

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