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

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Concrete Technology and Design of Concrete Structures
Stress strain curve of high tensile steel

has a definite yield point
does not show definite yield point but yield point is defined by 0.1% proof stress
does not show definite yield point but yield point is defined by 2% proof stress,
does not show definite yield point but yield point is defined by 0.2% proof stress

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

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

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