current affairs MCQ #149

Which is the hardest among the following?

current affairs MCQ #149

  1. Question 1

    Q1. Which is the hardest among the following?

    • A) Radium
    • B) Diamond
    • C) Graphite
    • D) Gold

    Answer: Diamond

    Explanation: Diamond is the hardest natural substance known, scoring 10 on the Mohs hardness scale, harder than all other listed materials.