Building Construction
The lintels are preferred to arches because

Arches require strong abutments to withstand arch thrust
All of these
Arches require more headroom to span the openings like doors, windows etc.
Arches are difficult in construction

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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
A flap valve at the bottom of tube is provided to extract the soil sample
The tube is raised and lowered by 4 thick rope moving over a pulley suspended on a tripod stand
All listed here

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Building Construction
Depth or height of the arch is the

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

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