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

Co-polymerization
Condensation polymerization
Addition polymerization
None of these

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Building Materials
Veneering means

Thin layer of superior wood glued to inferior wood
Carving out designs on timber planks
Chemically treating timber planks
Thick layer of superior wood glued to inferior wood

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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
All listed here
10 percent surface is covered with grey or white deposits, the brick has slight efflorescence
50 percent surface is covered with grey or white deposits, the brick has serious efflorescence

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