Building Construction
Raft foundations are used for:

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

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Building Construction
Pick up the correct statements from the following:

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
All listed here
Excessive thermal variations in the backing or plaster causes the plaster to fall

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