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If P kg/m2 is the upward pressure on the slab of a plain concrete footing whose projection on either side of the wall is a cm, the depth of foundation D is given by

D = 0.00775 aP
D = 0.0775 aP
D = 0.07775 aP
D = 0.775 Pa

Correct Answer: D = 0.00775 aP

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