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31 . The under surface of an arch, is called
A. soffit B. intrados
C. haunch D. back

32 . The raft slab is projected beyond the outer walls of the structure by
A. 5 to 10 cm
B. 15 to 20 cm
C. 25 to 30 cm
D. 30 to 45 cm

33 . The process of making the back ground rough, before plastering, is
A. dubbing B. hacking
C. blistering
D. peeling

34 . Black cotton soil is unsuitable for foundations because its
A. bearing capacity is low
B. permeability is uncertain
C. particles are cohesive
D. property to undergo a volumetric change due to variation of moisture content.

35 . The loose pockets in soil mass can be bridged safely by providing a raft foundation provided the soft area is smaller than
A. the column spacing
B. one-third the column spacing
C. half the column spacing
D. three-fourth the column spacing




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