This quiz works best with JavaScript enabled. Home > Class 9 > Class 9 Science Chapter 9 Force And Laws Of Motion – Quiz 8 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 9 Force And Laws Of Motion Quiz 8 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A boy of mass 50 Kg running at 5 m/s jumps on to a 20Kg trolley travelling in the same direction at 1.5 m/s. What is the common velocity? A) 4.5 m/s. B) 3 m/s. C) 3.5 m/s. D) 4 m/s. Show Answer Correct Answer: D) 4 m/s. 2. If the mass of a body is doubled and its velocity becomes half, then the linear momentum of the body will A) Remain same. B) Become double. C) Become half. D) Become four times. Show Answer Correct Answer: A) Remain same. 3. Balanced forces do not change the state of motion of an object. A) True. B) False. C) None of these. D) Don't Know. Show Answer Correct Answer: A) True. 4. What is the tendency of a body to resisist change in it's state of motion called? A) Inertia. B) Momentum. C) Gravitation. D) Friction. Show Answer Correct Answer: A) Inertia. 5. A high school student hits a nail with a hammer. During the collision, there is a force A) On the nail but not on the hammer. B) On the nail and also on the hammer. C) On the hammer but not on the nail. D) On neither. Show Answer Correct Answer: B) On the nail and also on the hammer. 6. Which has more inertia ..... A) Truck. B) Cat. C) Ant. D) Skateboard. Show Answer Correct Answer: A) Truck. 7. WHAT IS A INERTIA? A) 2 LAW OF MOTION. B) THE NATURAL TENDENCY OF AN OBJECT TO RESIST A CHANGE IN THEIR STATE OF REST OR OF UNIFORM MOTION. C) A PUSH OR A PULL OR A HIT. D) ALL OF THESE. Show Answer Correct Answer: B) THE NATURAL TENDENCY OF AN OBJECT TO RESIST A CHANGE IN THEIR STATE OF REST OR OF UNIFORM MOTION. 8. SI unit of linear momentum is A) Kg m /s. B) G m/s. C) Kg cm/s. D) All of these. Show Answer Correct Answer: A) Kg m /s. 9. Rockets work on the principle of Newton's A) First law. B) Second law. C) Third law. D) None of these. Show Answer Correct Answer: C) Third law. 10. A man is standing on a boat in still water. If he walks towards the shore, the boat will A) Move away from the shore. B) Remain stationary. C) Move towards the shore. D) Sink. Show Answer Correct Answer: A) Move away from the shore. 11. Which of these is an example of Newton's Second Law, F=ma A) A tug of war where both sides pull equally, and the rope doesn't move. B) A wide receiver using his hands to stop and catch a football thrown by the quarterback. C) A car traveling on a straight part of the highway with a cruise control set at constant velocity. D) A book pushing down on the desk where it is resting. Show Answer Correct Answer: A) A tug of war where both sides pull equally, and the rope doesn't move. 12. Newton's third law states that any action will have a(n) ..... and ..... reaction A) Equal and similar. B) Equal and opposite. C) Equal and different. D) Greater and opposite. Show Answer Correct Answer: B) Equal and opposite. 13. An automobile you are riding in suddenly stops, but you continue to go forward. A) Newton's 1st Law of Motion. B) Newton's 2nd Law of Motion. C) Newton's 3rd Law of Motion. D) None of the above. Show Answer Correct Answer: A) Newton's 1st Law of Motion. 14. A ball is thrown vertically upward in a train moving with uniform velocity. The ball will A) Fall behind the thrower. B) Fall ahead of the thrower. C) Return back to the thrower. D) Fall on the left of the thrower. Show Answer Correct Answer: C) Return back to the thrower. 15. When a 12 N force acts on 3 kg mass for a second, the change in velocity is (in m/s) A) 36. B) 4. C) 2. D) 8. Show Answer Correct Answer: B) 4. 16. When a number of forces acting simultaneously on a body bring about a change in its state of rest or of uniform motion in a straight line, then these forces acting on the body are said to be A) Balanced forces. B) Equal forces. C) Unbalanced forces. D) Opposite forces. Show Answer Correct Answer: D) Opposite forces. 17. A force of 3 N accelerates a mass of 3 kg at the rate of 1 m/s$^{2}$. The acceleration of a mass of 6 kg acted upon a force of 6 N is A) Twice as much. B) Half as much. C) The same. D) None of those answers. Show Answer Correct Answer: C) The same. 18. A force can be: A) A pull. B) A push. C) Neither of these. D) Both of these. Show Answer Correct Answer: D) Both of these. 19. In the equation (p) = (m) x (v)what does each letter stand for A) P = momentum, m = mass, v = vector. B) P = mass, m = momentum, v= velocity. C) P = momentum, m = mass, v = velocity. D) None of the above. Show Answer Correct Answer: C) P = momentum, m = mass, v = velocity. 20. Which factor affects inertia A) Force. B) Mass. C) Velocity. D) Acceleration. Show Answer Correct Answer: B) Mass. 21. What is a PUSH or PULL of an object? A) Motion. B) Force. C) Friction. D) Gravity. Show Answer Correct Answer: B) Force. 22. Objects with greater Inertia have greater A) Intelligence. B) Mass. C) Force. D) None of the above. Show Answer Correct Answer: B) Mass. 23. Newton's Law of Inertia describes the motion of- A) Objects at rest only. B) Objects in motion only. C) Objects at rest and objects that are in motion. D) Objects without a mass and resist being set into motion. Show Answer Correct Answer: C) Objects at rest and objects that are in motion. 24. Direction of momentum is direction of ..... A) Speed. B) Velocity. C) Accelaration. D) Force. Show Answer Correct Answer: B) Velocity. 25. Newton's third law is about A) Force and Inertia. B) Change in momentum. C) Inertia at reactions. D) Action and reaction. Show Answer Correct Answer: D) Action and reaction. ← PreviousNext →Related QuizzesClass 9 Science Chapter 9 Force And Laws Of Motion Quiz 1Class 9 Science Chapter 9 Force And Laws Of Motion Quiz 2Class 9 Science Chapter 9 Force And Laws Of Motion Quiz 3Class 9 Science Chapter 9 Force And Laws Of Motion Quiz 4Class 9 Science Chapter 9 Force And Laws Of Motion Quiz 5Class 9 Science Chapter 9 Force And Laws Of Motion Quiz 6Class 9 Science Chapter 9 Force And Laws Of Motion Quiz 7Class 9 Science Chapter 9 Force And Laws Of Motion Quiz 9Class 9 Science Chapter 9 Force And Laws Of Motion Quiz 10Class 9 Science Chapter 9 Force And Laws Of Motion Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books