Building Construction
Depth or height of the arch is the

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

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Building Construction
In the method of tube boring of soil investigation, the following is essential:

A tube of about 2 meters length and 20 cm diameter with a cutting edge
All listed here
The tube is raised and lowered by 4 thick rope moving over a pulley suspended on a tripod stand
A flap valve at the bottom of tube is provided to extract the soil sample

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