1 .	Which of the following is mixed to make steel hard ?
[ A ]    Quantity of carbon [ B ]    Quantity of Manganese [ C ]    Quantity of Silicon [ D ]    Quantity of Chromium
Answer : Option A Explanation : Carbon strengthens iron by distorting its crystal lattice. This distortion is similar in effect to work hardening. It is unfortunately a very complex effect and depends on how the steel is heat treated and exactly what percentage of carbon is added (<4% by wt. normally)
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