Building Materials
When a brick is immersed in water for 24 hours and then dried, if

10 percent surface is covered with grey or white deposits, the brick has slight efflorescence
All listed here
50 percent surface is covered with grey or white deposits, the brick has serious efflorescence
No grey or white deposits appear on the surface, the brick is free from soluble salts

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Building Materials
Priming consists of

One part of white lead, 8 parts of chalk and one part of linseed oil
One part of white lead, 8 parts of chalk and four parts of twice boiled linseed oil
None to these
8 parts of white lead, one part of chalk and four parts of twice boiled linseed oil

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Building Materials
The basic purpose of a retarder in concrete is

To improve the workability of concrete mix
To increase the initial setting time of cement paste in concrete
To render the concrete more water tight
To decrease the initial setting time of cement paste in concrete

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