Which of the following is the hardest substance available on earth?

A. Diamond
B. Iron
C. Platinum
D. Gold

Answer

Correct Answer: A. Diamond


Detailed About MCQs

Diamond is the hardest substance available on earth. Diamond is a solid form of the element carbon with its atoms arranged in a crystal structure. The hardness of diamond and its high dispersion of light make it useful for industrial applications and desirable as jewelry.