2. Sample Papers
  3. 9th Class
  4. Science

9th Class Science Sample Paper Science Olympiad Model Test Paper-9

  • question_answer
    The sound whose frequency is less than 20 Hz, is called:

    A) Audible sound

    B) Infrasonic sound

    C) Ultrasonic sound

    D) Sonic boom

    E) None of these

    Correct Answer: B

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