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

  • question_answer
    DIRECTIONS: Read the following three statements carefully and choose the correct option. Statement 1: Kinetic energy of a body is quadrupled, when its velocity is doubled. Statement 2: Kinetic energy is proportional to square of velocity. Statement 3: Kinetic energy is the energy of body due to its motion.

    A) Statement (1) and (3) are incorrect while statement (2) is correct.

    B) Statement (1) and (2) are incorrect while (3) is correct.

    C) All the statements are correct.

    D) All the statements are incorrect.

    Correct Answer: C

    Solution :

         \[K=\frac{1}{2}m{{v}^{2}}\therefore K\propto {{v}^{2}}\]


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