Building Construction
Raft foundations are used for:

Providing increased area of foundation over poor bearing capacity of soil
Counter acting the hydrostatic effect
Spanning over small soft or loose pockets
All listed here

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Building Construction
Pick up the correct statements from the following:

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

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