Engineering Materials
When medium carbon steel is heated to coarsening temperature

There is no change in grain size
The grain size first increases and then decreases very rapidly
The grain size increases very rapidly
The average grain size is a minimum

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Engineering Materials
Amorphous material is one

In which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid
In which atoms align themselves in a geometric pattern upon solidification
Which is not attacked by phosphorous
Which emits fumes on melting

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