Building Construction
Raft foundations are used for:

Providing increased area of foundation over poor bearing capacity of soil
All listed here
Spanning over small soft or loose pockets
Counter acting the hydrostatic effect

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

The tube is raised and lowered by 4 thick rope moving over a pulley suspended on a tripod stand
All listed here
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

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Building Construction
Negative skin friction

Is a downward drag acting on a pile due to downward movement of the surrounding compressible soil relative to the pile
Develops due to lowering of ground water
Neither (A) not (B)
Both (A) and (B)

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