Multiple choice general knowledge

A "black hole" is a body in space which does not allow any radiation to come out. This property is due to its

  1. Very small size

  2. Very high density

  3. Very large size

  4. Very low density
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Black holes have extremely high density, which creates such intense gravitational pull that not even light can escape - this is the definition of a black hole. The escape velocity exceeds the speed of light. Small size alone doesn't prevent radiation escape, and large size with low density would not create a black hole.

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