This quiz works best with JavaScript enabled. Home > Class 9 > Class 9 Science Chapter 9 Force And Laws Of Motion – Quiz 4 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 9 Force And Laws Of Motion Quiz 4 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. According to Newton's Laws, for every action there is an ..... A) Equal and opposite reaction. B) Equal and parallel reaction. C) Unequal and opposite reaction. D) Unequal and unrelated reaction. Show Answer Correct Answer: A) Equal and opposite reaction. 2. What is Newton's First Law? A) Object in motion stays in motion and an object at rest stays at rest unless acted on by a outside force. B) Force = mass x acceleration. C) For every action there is an equal and opposite reaction. D) None of the above. Show Answer Correct Answer: A) Object in motion stays in motion and an object at rest stays at rest unless acted on by a outside force. 3. A water tanker filled up to 2/3 of its height is moving with a uniform speed. On a sudden application of brakes, the water in the tank would A) Move backward. B) Move forward. C) Be unaffected. D) Rise upwards. Show Answer Correct Answer: B) Move forward. 4. How much force acts on a body whose momentum is constant? A) Zero. B) P / 2t. C) 2p / t. D) None. Show Answer Correct Answer: A) Zero. 5. Which of the following is not an illustration of Newton's third law? A) Flight of a jet. B) A cricket player lowering his hand while catching a cricket ball. C) Walking on a floor. D) Rebounding of a rubber ball. Show Answer Correct Answer: B) A cricket player lowering his hand while catching a cricket ball. 6. Which of these is evidence that an unbalanced force is acting on an object? A) The mass of the object is changing. B) The object continues moving in a straight line. C) The object remains at rest. D) The motion of the object is changing. Show Answer Correct Answer: D) The motion of the object is changing. 7. A baseball is thrown a distance of 50 meters. What is the speed if it takes 2 seconds to cover that distance? A) 100 m/s$^{2}$. B) 25 m/s$^{2}$. C) 52 m/s$^{2}$. D) 100 seconds. Show Answer Correct Answer: B) 25 m/s$^{2}$. 8. If a force of 26 N is exerted on two balls, one with a mass of 0.52 kg and the other with a mass of 0.78 kg, which ball will have the greater acceleration? A) 0.78 kg. B) 0.52 kg. C) 0.56. D) 0.89. Show Answer Correct Answer: B) 0.52 kg. 9. If a 10 kilogram object accelerates suddenly at 15 m/s$^{2}$, how much force was applied to the object? A) 150 Newtons. B) 15 Newtons. C) 150 kilograms. D) 100 kilograms. Show Answer Correct Answer: A) 150 Newtons. 10. Inertia can be of A) All of these types. B) Motion. C) Direction. D) Rest. Show Answer Correct Answer: A) All of these types. 11. A train passes over a 400 m long bridge. If the speed of the train is 30 m/s and the train takes 20 s to cross the bridge, then tell me the length of the train (your gift for correctly answering this question is a chocolate). A) 400 m. B) 200 m. C) 600 m. D) 800 m. Show Answer Correct Answer: B) 200 m. 12. 20 N is the ..... A) Mass. B) Force. C) Acceleration. D) Weight. Show Answer Correct Answer: B) Force. 13. A passenger in a moving train tosses a coin which falls behind him. It means that motion of the train is ..... A) Accelerated. B) Uniform. C) Retarded. D) Retarded. Show Answer Correct Answer: A) Accelerated. 14. Which force produces a change in motion? A) Unbalanced force. B) Balanced force. C) Gravitational force. D) Frictional force. Show Answer Correct Answer: A) Unbalanced force. 15. An object continues to stay in motion unless ..... is applied. A) Unbalanced force. B) Balanced force. C) External force. D) Frictional force. Show Answer Correct Answer: C) External force. 16. When a cannon fires a cannonball we observe Newton's third law. Which force is the reaction force? A) The cannon moving backward. B) The cannon moving forward. C) The cannonball moving forward. D) The cannonball moving backward. Show Answer Correct Answer: A) The cannon moving backward. 17. When a bird flies, its wings push air downward. As a result the air pushes back upward on the bird. Which law of motion most applies to the way the wings of a bird beat? A) Every action has an equal and opposite reaction. B) The rate of acceleration of an object depends on the amount of force applied. C) Objects in motion tend to remain in motion until acted upon by an another force. D) Force is defined by mass times acceleration. Show Answer Correct Answer: A) Every action has an equal and opposite reaction. 18. A mass is doubled and the net force is kept constant. The acceleration of the body ..... A) Is halved. B) Remains the same. C) Is doubled. D) Is tripled. Show Answer Correct Answer: A) Is halved. 19. The tendency of a body to continue in its state of rest or of uniform motion, even on the application of external force is known as A) Force. B) Momentum. C) Inertia. D) Impulse. Show Answer Correct Answer: C) Inertia. 20. Recoiling of gun is an example of ..... law of motion. A) Pear. B) An offer. C) 1 stem. D) NONE OF THESE. Show Answer Correct Answer: B) An offer. 21. During a collision ..... is always constant A) Force. B) Motion. C) Momentum. D) Velocity. Show Answer Correct Answer: C) Momentum. 22. Newton's second law states ..... A) If there is more mass then there is more acceleration. B) An object at rest wants to be in motion. C) Force = Mass x Acceleration. D) The force exerted on an object is not related to mass or acceleration. Show Answer Correct Answer: C) Force = Mass x Acceleration. 23. ASSERTION(A)-The wings of a bird push air downwards and the air must be pushing the birds upwards.Reason(R)-For every action there is an equal reaction in the same direction A) Both A and R are true and R is the correct explanation of A. B) Both A and R are true but R is not the correct explanation of A. C) A is true but R is false. D) A is false but R is true. Show Answer Correct Answer: C) A is true but R is false. 24. When two objects collide A) P1> P2. B) P1 C) P1 = P2. D) P1 * P2 = P1 + P2. Show Answer Correct Answer: C) P1 = P2. 25. Motion's first equation is. A) V=u+at. B) U=v+at. C) A = ut+in. D) T=u+vt. Show Answer Correct Answer: A) V=u+at. ← 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 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 8Class 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