RCC Structures Design
The toe projection of foundation slabs is taken

As one sixth of overall height of the wall
As one third of the base
Equal to heel slab
Below ground surface

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RCC Structures Design
A pre-stressed concrete member is preferred because

Removal of cracks in the members due to shrinkage
Its dimensions are not decided from the diagonal tensile stress
All listed here
Large size of long beams carrying large shear force need not be adopted

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