Building Construction
You are asked to design and supervise a truss for a factory to have spans 6 m to 9 m. The type of the truss you will use, is

Collar truss
Mansard truss
King post truss
Queen post truss

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Building Construction
Negative skin friction

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

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Building Construction
Raft foundations are used for:

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

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