📊 Science
Q. A balloon filled with helium rises in air as
  • (A) helium pushes down on the air below the balloon
  • (B) air exerts an upward force on the balloon
  • (C) helium is less dense than air
  • (D) the balloon is weightless
✅ Correct Answer: (C) helium is less dense than air

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Ram Sharma
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