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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RCC Structures Design
In a singly reinforced beam

Steel possesses initial stresses when embedded in concrete
Plane sections transverse to the centre line of the beam before bending remain plane after bending
Compression is borne entirely by concrete
Elastic moduli for concrete and steel have different values within the limits of deformation of the beam

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