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Everyday Science Medium PMS Uploaded: 01 Sep 2026

Which gas is filled in balloons to make them float in air?

  • A Oxygen
  • B Helium
  • C Carbon dioxide
  • D Nitrogen
Correct Answer: Option B — Helium
Explanation:
Helium is lighter than air and non-flammable, making it ideal for filling balloons so they float safely.
Submitted by: PaperMCQs
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