2. Questions Bank
  3. 3rd Class
  4. Science
  5. Lights, Sound and Force

3rd Class Science Lights, Sound and Force Question Bank Light Sound and Force

  • question_answer
    Roy wants to make a list of actions that show friction produces heat. Which of the following could he include in his list?
    (a) Rubbing hands together
    (b) Scratching a match stick against the box
    (c) Sawing wood
    (d) Drilling a hole into metal sheet
    (e) Rubbing off some pencil marks with an eraser
     

    A) (a) and (e) only                  

    B) (a), (b) and (e) only

    C) (a), (b), (c) and (e) only          

    D) (a), (b), (c), (d) and (e)

    Correct Answer: D

    Solution :

    As all these actions involve two surfaces rubbing against each other, thus force of friction comes into action which produces heat.


You need to login to perform this action.
You will be redirected in 3 sec spinner