Building Construction
While investigating the site, a thick layer of fairly firm clay over a deep layer of soft clay is encountered. In such a situation, the following type of foundation is useful:

None of these
Pile formation
Grillage foundation
Raft foundation

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Building Construction
Depth or height of the arch is the

None of these
Vertical distance between springing line and intrados
Perpendicular distance between springing line and extrados
Perpendicular distance between intrados and extrados

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