issb general knowledge MCQ #10

The hardest natural substance on Earth is:

issb general knowledge MCQ #10

  1. Question 1

    Q1. The hardest natural substance on Earth is:

    • A) Gold
    • B) Iron
    • C) Diamond
    • D) Platinum

    Answer: Diamond

    Explanation: Diamond ranks 10 on Mohs hardness scale. Used in cutting tools. Gold/platinum are precious metals, not hardest minerals.