RCC Structures Design
If K is a constant depending upon the ratio of the width of the slab to its effective span l, x is the distance of the concentrated load from the nearer support, bw is the width of the area of contact of the concentrated load measured parallel to the supported edge, the effective width of the slab be is

Kx (1 + x/l) + bw
All listed here
K/x (1 + x/d) + bw
Kx (1 - x/l) + bw

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RCC Structures Design
According to I.S. : 456, slabs which span in two directions with corners held down, are assumed to be divided in each direction into middle strips and edge strips such that the width of the middle strip, is

Two-third of the width of the slab
Half of the width of the slab
Three-fourth of the width of the slab
Four-fifth of the width of the slab

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RCC Structures Design
Pick up the assumption for the design of a pre-stressed concrete member from the following:

Variation of stress in reinforcement due to changes in external loading is negligible
A transverse plane section remains a plane after bending
All listed here
During deformation limits, Hook's law is equally applicable to concrete as well as to steel

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