Building Construction
The loose pockets in soil mass can be bridged safely by providing a raft foundation provided the soft area is smaller than

Half the column spacing
Three-fourth the column spacing
One-third the column spacing
The column spacing

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

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