RCC Structures Design
The stresses developed in concrete and steel in reinforced concrete beam 25 cm width and 70 cm effective depth, are 62.5 kg/cm² and 250 kg/cm² respectively. If m = 15, the depth of its neutral axis is

30 cm
35 cm
25 cm
20 cm

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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
All listed here
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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