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

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Concrete Technology and Design of Concrete Structures
Assertion A : The load factor for live load is greater than that for dead load.Reason R : The live loads are more uncertain than dead loads.Select your answer based on the coding system given below :

A is false but R is true.
Both A and R are true and R is the correct explanation of A.
Both A and R are true but R is not the correct explanation of A.
A is true but R is false.

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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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Concrete Technology and Design of Concrete Structures
If the foundations of all the columns of a structure are designed on the total live and dead load basis, then

the settlement of interior columns will be more than exterior columns
the settlement of exterior columns will be more than interior columns
there will be no differential settlement
there will be no settlement of columns

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