A balloon ruled with hydrogen will

A. continue going upwards uninterrupted

B. reach a particular height and remain floating

C. burst after reaching some height

D. reach a particular height and start coming down

Please do not use chat terms. Example: avoid using "grt" instead of "great".

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  1. A device used to measure heights above sea level is known as
  2. A pair of stars that revolve round each other is
  3. One can be recognised by his voice alone due to the factor of
  4. The hydraulic jack to lift heavy vehicles in automobile service stations is one of the applications…
  5. The Milky Way is
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  20. The power of a lens is
  21. Choose the correct answer
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  24. Why is nuclear fusion also known as thermonuclear reaction?
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