Q47
Steel contains
A.
80% or more iron
AnswerB.
50% or more iron
C.
Alloying elements like chromium, tungsten nickel and copper
D.
Elements like phosphorus, sulphur and silicon in varying quantities
Answer: Option A
Solution
Answer: Option A
Solution:
Steel is primarily an alloy of iron and carbon, with iron being the major component.By definition, steel contains more than 80% iron, and the rest is mainly carbon (usually less than 2%) along with small amounts of other elements.
Option A is correct because it directly reflects the high percentage of iron in steel, which typically exceeds 80% in composition.
Option B is incorrect as 50% is too low to define steel; that would categorize it as a different alloy.
Option C mentions alloying elements which are used in special steels (like stainless steel), but they are present in much smaller proportions and are not defining features of all steels.
Option D lists impurities or residual elements often found in steel, but they are not the primary constituents.
Therefore, the correct answer is Option A: 80% or more iron