Building Construction
During percussion drilling

The soil to a considerable depth below the bottom of the hole gets disturbed
Caving or mixing of strata are caused in soft soils or cohesion-less soils
All listed here
Ground water observations are hindered due to entry of the slurry in the soil below the bottom of the hole

ANSWER DOWNLOAD EXAMIANS APP

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

ANSWER DOWNLOAD EXAMIANS APP

Building Construction
Depth or height of the arch is the

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

ANSWER DOWNLOAD EXAMIANS APP