Concrete Technology and Design of Concrete Structures
For a reinforced concrete section, the shape of shear stress diagram is

rectangular above neutral axis and parabolic below neutral axis
wholly rectangular
wholly parabolic
parabolic above neutral axis and rectangular below neutral axis

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Concrete Technology and Design of Concrete Structures
Examine the following statements :i) Factor of safety for steel should be based on its yield stress,ii) Factor of safety for steel should be based on its ultimate stress,iii) Factor of safety for concrete should be based on its yield stress,iv) Factor of safety for concrete should be based on its ultimate stress.The correct statements are

(ii) and (iv)
(i) and (iii)
(i) and (iv)
(ii) and (iii)

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