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 examples mechanical energy is transformed into heat energy?

    A) Electrolysis

    B) Rubbing two pieces of stone to generate fire.

    C) Burning of magnesium.

    D) In steam engine.

    E) None of these

    Correct Answer: B

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