Concrete Technology and Design of Concrete Structures
Critical section for shear in case of flat slabs is at a distance of

d/2 from periphery of column/capital/ drop panel
effective depth of slab from periphery of column/drop panel
at the periphery of column
at the drop panel of slab

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Concrete Technology and Design of Concrete Structures
According to IS : 456-1978, the fiexural strength of concrete is

inversely proportional to compressive strength
directly proportional to compressive strength
inversely proportional to square root of compressive strength
directly proportional to square root of compressive strength

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