7th Class Science Related to Competitive Exam Question Bank Work and energy

  • question_answer
    DIRECTIONS: On the basis of following diagram/ picture answer the questions given below: Rima's bicycle has a dynamo (a small electrical generator) and a lamp. As she pedals, the dynamo spins and her lamp lights up, helping her to see at night. Which of the following correctly shows the energy conversions that occur?

    A) Electrical energy \[\to \] kinetic energy + light energy + heat energy

    B) Kinetic energy \[\to \] chemical potential energy \[\to \] light energy

    C) Kinetic energy \[\to \] electrical energy \[\to \] light energy + heat energy

    D) Chemical potential energy \[\to \] electrical energy\[\to \]light energy

    Correct Answer: C

    Solution :

        As Priya pedals, the dynamo spins and converts kinetic energy to electrical energy. The electrical energy is converted to heat and light energy in the bicycle lamp.


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