Building Construction
The depth of concrete bed of the foundation depends upon

The projection of the concrete block beyond the footing over it
The upward soil pressure
The mix of the concrete
All listed here

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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
Cracks appear on the plastered surface in the form of hair cracks
In brick work, the efflorescence is removed by applying a solution of zinc sulphate and water
All listed here

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