Building Construction
Depth of lean concrete bed placed at the bottom of a wall footing, is kept

Less than its projection beyond wall base
15 cm
Equal to its projection beyond wall base
10 cm

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Building Construction
Depth or height of the arch is the

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

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