Building Construction
In a colar beam roof

There is a horizontal tie at almost the middle of rafters only
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
There is no horizontal tie beam

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Building Construction
Negative skin friction

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

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