9th Class Science Sample Paper Science Olympiad Model Test Paper-21

  • question_answer
    Which one of the following statements is incorrect?

    A) If a force acting on a body of mass 1 kg produces an acceleration of \[1\text{ }m/{{s}^{2}}\]in it, the force is called one newton.

    B) The net force acting on a body is equal to the change in its momentum per unit time.

    C) According to law of inertia, when no unbalanced force is exerted on a body, it stays at rest or moves in a straight line with constant speed

    D) Momentum is a vector quantity.

    E) None of these

    Correct Answer: E

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