Building Construction
In a colar beam roof

There is a horizontal tie at almost the middle of rafters only
There is no horizontal tie beam
There is a horizontal tie at the feet of rafters only
There are two horizontal ties, one at the feet and other at the middle of the rafters

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Building Construction
Negative skin friction

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)
Both (A) and (B)
Develops due to lowering of ground water

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