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      Question

      Among the given options, which one causes an

      echo?
      A When sound is reflected Correct Answer Incorrect Answer
      B When sound waves travel through a solid medium Correct Answer Incorrect Answer
      C When sound waves travel through a liquid medium Correct Answer Incorrect Answer
      D When sound waves travel through a vacuum Correct Answer Incorrect Answer

      Solution

      An echo is caused by: When sound is reflected.

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