Engineering Materials
A reversible change in the atomic structure of steel with corresponding change in the properties is known as

Physical change
Molecular change
Solidus change
Allotropic change

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Engineering Materials
Combined carbon in iron makes the metal

Soft and gives a fine grained crystalline structure
Hard and gives a coarse grained crystalline structure
Hard and gives a fine grained crystalline structure
Soft and gives coarse grained crystalline structure

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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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