Universal time is based on

Options :
  1. Rotation of the earth on its axis
  2. Vibrations of caesium atom
  3. Revolution of earth
  4. None of the above


Answer and Explanation :-

Answer: Option 2

Explanation:

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Memory isn't the defective tape recording you've been led to believe. It's the tape player itself, playing back the tracks of music we select-and sometimes those we don't.
-James P. Kimmel The Trial of Fallen Angels