Engineering Materials
Pearlite consists of

13% cementite and 87% ferrite
13% carbon and 87% ferrite
6.67% carbon and 93.33% iron
13% ferrite and 87% cementite

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Engineering Materials
Stress relaxation is the phenomenon

Stress reduces on increasing load
In which parts are not loaded
In which stress remains constant on increasing load
In which deformation tends to loosen the joint and produces a stress reduced

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Engineering Materials
Pick up wrong statement about wrought iron

It contains carbon of the order of 0 to 0.25%
It is made by adding suitable percentage of carbon to molten iron and subjecting the product to repeated hammering and rolling
It melts at 1535°C
It is very soft and ductile

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