Engineering Materials
Amorphous material is one

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

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Engineering Materials
Recrystallization temperature is one

At which change of allotropic form takes place
At which crystals first start forming from molten metal when it is cooled
At which crystals grow bigger in size
At which new spherical crystals first begin to form from the old deformed one when a strained metal is heated

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Engineering Materials
In spheroidising process, the steel is

None of these
Heated below the lower critical temperature and then cooled slowly
Heated up to the lower critical temperature and then cooled in still air
Heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C

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