RCC Structures Design
Post tensioning system

Is not economical and hence not generally used
Was widely used in earlier days
None of these
Is economical for large spans and is adopted now a days

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RCC Structures Design
Based on punching shear consideration, the overall depth of a combined footing under a column A, is

(Perimeter of column A × Safe punching stress)/(Load on column A + Upward pressure × Area of the column)
None of these
(Area of the column A × Safe punching stress)/Load on column A
(Perimeter of column A × Safe punching stress)/(Load on column A × Upward pressure × Area of the column)

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

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

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