Knocking sound occurs in engine when fuel

Options :
  1. ignites slowly
  2. ignites rapidly
  3. contains water
  4. none of the above


Answer and Explanation :-

Answer: Option 2

Explanation:

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I wanted a perfect ending. Now I've learned, the hard way, that some poems don't rhyme, and some stories don't have a clear beginning, middle, and end. Life is about not knowing, having to change, taking the moment and making the best of it, without knowing what's going to happen next.Delicious Ambiguity.
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