Concrete Technology and Design of Concrete Structures
High carbon content in the steel causes

decrease in both tensile strength and ductility
decrease in tensile strength but increase in ductility
increase in tensile strength but decrease in ductility
increase in both tensile strength and ductility

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Concrete Technology and Design of Concrete Structures
In prestressed concrete

forces of tension and compressions remain unchanged but lever arm changes with the moment
both forces of tension and compres-sion as well as lever arm change
both forces of tension and compres-sion as well as lever arm remain unchanged
forces of tension and compression change but lever arm remains unchanged

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

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