Engineering Materials
A material is known as allotropic or polymorphic if it

Responds to heat treatment
Has its atoms distributed in a random pattern
Exists in several crystal forms at different temperatures
Has a fixed structure under all conditions

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Engineering Materials
In spheroidising process, the steel is

Heated below the lower critical temperature and then cooled slowly
None of these
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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