Building Construction
Raft foundation are generally preferred to when the area required for individual footing, is more than

30% of total area
40% to total area
25% to total area
50% of total area

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Building Construction
Pick up the correct statements from the following:

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