Building Construction
The term string is used for

Outer projecting edge of a tread
A vertical member between two treads
A sloping member which supports the steps in a stair
The underside of a stair

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Building Construction
Negative skin friction

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

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