Building Construction
The type of joint commonly used at the junction of a principal rafter and tie beam in timber trusses is

Butt joint
Mitred joint
Oblique mortise and tenon joint
Mortise and tenon joint

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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
A flap valve at the bottom of tube is provided to extract the soil sample
All listed here
A tube of about 2 meters length and 20 cm diameter with a cutting edge

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Building Construction
Auger boring

All of these
Is most economical up-to a depth of 5 meters
Is generally employed in cohesive and other self soils above water table
Is the most primitive method for making a hole in the ground

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Building Construction
Negative skin friction

Neither (A) not (B)
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
Both (A) and (B)

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