Concrete Technology and Design of Concrete Structures
According to IS : 456-1978, the fiexural strength of concrete is

inversely proportional to square root of compressive strength
directly proportional to square root of compressive strength
directly proportional to compressive strength
inversely proportional to compressive strength

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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

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

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Concrete Technology and Design of Concrete Structures
Due to circumferential action of the spiral in a spirally reinforced column

Capacity of column is decreased
Both the capacity of column and ductility of column increase
Capacity of column is decreased but ductility of column increases
Ductility of column reduces

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