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

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

  • question_answer
    A boy lifts a book of known weight from the surface of a table. To calculate the work done, what does he need to know?

    A)  The mass of the book

    B)  The height  

    C)  The cost of the book

    D)  The time taken by him

    Correct Answer: B

    Solution :

     \[P.E.\] is involved, mass is known. So, he requires height.


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