Building Construction
An arch may fail due to

All listed here
Uneven settlement of abutments
Sliding of voussoirs
Crushing of the material

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Building Construction
Negative skin friction

Is a downward drag acting on a pile due to downward movement of the surrounding compressible soil relative to the pile
Both (A) and (B)
Neither (A) not (B)
Develops due to lowering of ground water

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Building Construction
Slate

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

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