Building Materials
The compound of Portland cement which reacts immediately with water and also sets first is

Di-calcium silicate
Tetra calcium alumino ferrite
Tri-calcium silicate
Tri-calcium aluminate

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Building Materials
The plywood

Cannot be bent more easily than ordinary wood of same thickness
Has greater impact resistance to blows than ordinary wood
Can be spilt in the plane of the panel
Has good strength along the panel only

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

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