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Multiple choice general knowledge science & technology

Which one of the following best defines a black hole?

  1. Black hole is a very high density compact mass which bends the space-time curve in such a manner that not even light can escape from it.

  2. A bright star after completing its life becomes a black hole.

  3. A very bright and dense lump of mass whose gravitation is strong enough to let nothing escape from it.

  4. none of these
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