Building Construction
Slate

Has a smooth surface and contains alumina and silica
Is a metamorphic rock
Splits into thin sheets along its bedding planes
Possesses good water absorption capacity

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Building Construction
Pick up the correct statements from the following:

Cracks appear on the plastered surface in the form of hair cracks
All listed here
In brick work, the efflorescence is removed by applying a solution of zinc sulphate and water
Excessive thermal variations in the backing or plaster causes the plaster to fall

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