What is the hardest mineral known to man?

More General Knowledge MCQs

• Which planet in our solar system has a ‘Great Red Spot’?
• Which bone is known as the ‘Breastbone’?
• The ‘Great Sphinx’ is located in which country?
• Which vitamin is essential for ‘Collagen’ synthesis?
• Which gas is used in ‘Light bulbs’ to prevent oxidation?