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Everyday science: GK questions and answers

Why does iron rust? What is air made of? These questions cover the simple physics and chemistry behind daily life, with the units and instruments that every student should know.

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Ten questions picked at random from this topic, four choices each. Or go through every question as flash cards.

20 questions on everyday science

  1. What is the chemical formula of water? H₂O
  2. At what temperature does pure water boil at sea level? 100°C
  3. At what temperature does water freeze? 0°C
  4. Which gas do plants take in to make their food? Carbon dioxide
  5. Which gas do we need to breathe in to stay alive? Oxygen
  6. Which gas makes up the largest part of the air? Nitrogen Air is about 78 per cent nitrogen and 21 per cent oxygen.
  7. What is the process by which green plants make food called? Photosynthesis
  8. What is the chemical name of common salt? Sodium chloride
  9. Which is the hardest natural substance? Diamond
  10. Which metal is liquid at room temperature? Mercury
  11. Which is the lightest gas? Hydrogen
  12. Through which of these can sound NOT travel? Vacuum Sound needs a medium to travel.
  13. What is the SI unit of force? Newton
  14. What is the SI unit of electric current? Ampere
  15. What is the SI unit of power? Watt
  16. Which instrument measures temperature? Thermometer
  17. Which instrument measures atmospheric pressure? Barometer
  18. Which instrument records earthquakes? Seismograph
  19. Iron rusts in the presence of which two things? Oxygen and water
  20. How many colours are there in a rainbow? Seven Violet, indigo, blue, green, yellow, orange and red.

These are well-established facts, written in our own words and last checked on 11 November 2026. If your textbook says something different, follow your textbook and tell us.

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