2. Questions Bank
  3. 9th Class
  4. Science
  5. Work and energy

9th Class Science Work and energy Question Bank Work, Energy and Sound

  • question_answer
    In which of the following multiple reflections of sound is used?

    A) In stethoscopes

    B) In megaphones

    C) Design of concert halls

    D) All the above

    E) None of these

    Correct Answer: D

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