Building Materials
In order of increasing percentage of silica, the correct sequence is

Sandy clay, calcareous clay, pure clay
Calcareous clay, pure clay, sandy clay
Pure clay, sandy clay, calcareous clay
None of these

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Building Materials
Priming consists of

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

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