This quiz works best with JavaScript enabled. Home > Class 9 > Class 9 Science Chapter 9 Force And Laws Of Motion – Quiz 14 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 9 Force And Laws Of Motion Quiz 14 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. An object in motion will stay in motion until acted on by an unbalanced force. An object at rest will stay at rest until acted on by an unbalanced force. 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. 2. If you increase the mass on an object, its acceleration A) Decreases. B) Stays the same. C) Also increases. D) Stops. Show Answer Correct Answer: A) Decreases. 3. Which of these undergo a change when force is applied? A) Change in direction. B) Change in momentum. C) Change in kinetic energy. D) All of the above. Show Answer Correct Answer: D) All of the above. 4. The equation to calculate momentum is A) P=mv. B) P=1/2mv$^{2}$. C) P=mgh. D) P=mg. Show Answer Correct Answer: A) P=mv. 5. Which law of motion is also called law of inertia? A) Law 1. B) Law 2. C) Law 3. D) Not mentioned. Show Answer Correct Answer: A) Law 1. 6. INERTIA IS DIRECTLY PROPORTIONAL TO ..... A) MASS. B) FORCE. C) MOMENTUM. D) ALL. Show Answer Correct Answer: A) MASS. 7. Which law of motion defines force? A) First law of motion. B) Second law of motion. C) Third law of motion. D) None of the above. Show Answer Correct Answer: B) Second law of motion. 8. You hit a wall with a stick. The equal but opposite reaction is ..... A) The wall pushes against you. B) The stick pushes against you. C) You push against the stick. D) The wall pushes against the stick. Show Answer Correct Answer: D) The wall pushes against the stick. 9. Which is an example of first law of motion? A) When a tree is vigrously shakes some of it's leaves fall from the tree. B) Huge damage to the train takes place when a moving train suddenly colloid against a stationary train. C) All the above. D) None of the above. Show Answer Correct Answer: A) When a tree is vigrously shakes some of it's leaves fall from the tree. 10. Which of the following is an example of Newton's third law? A) A ball rolling on the ground stops due to friction. B) A rocket moves forward by expelling gases backward. C) A person falling off a moving bus. D) An object at rest remains at rest. Show Answer Correct Answer: B) A rocket moves forward by expelling gases backward. 11. Mass is a measure of an object's inertia. Objects with greater mass have a greater inertia; objects with less mass have less inertia. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 12. What is balanced force? A) The force acting on a body is zero then the force in called balanced force. B) If the resultant force of all the force acting on the body is not zero then the force is balanced force. C) All the above. D) None of the above. Show Answer Correct Answer: A) The force acting on a body is zero then the force in called balanced force. 13. Newton's First Law States ..... A) Objects at rest tend to stay at rest unless acted on by an outside force. B) Objects accelerate often and it is difficult to know when or how they will accelerate. C) Objects in motion tend to stay in motion unless acted on by an outside force. D) Both A & C. Show Answer Correct Answer: D) Both A & C. 14. A driver accelerates his car first at the rate of 4 m/s$^{2}$ and then at the rate of 8 m/s$^{2 }$. Calculate the ration of the forces exerted by the engines? A) 4:1. B) 1:2. C) 2:1. D) 1:4. Show Answer Correct Answer: B) 1:2. 15. A water tanker filled up to 2 / 3 of its height is moving with a uniform speed. On sudden application of the brake, 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. 16. What is the standard unit force is measured in? A) Newtons. B) Pounds. C) Grams. D) Meters. Show Answer Correct Answer: A) Newtons. 17. A force of magnitude 'F' Acts on a body of mass 'm'.The acceleration of the body depends upon A) Volume of body. B) Density of body. C) Area of body. D) Mass of body. Show Answer Correct Answer: D) Mass of body. 18. F = on 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: B) Newton's 2nd Law of Motion. 19. Acceleration due to gravity, g, is ..... m/sec2. A) 4.9. B) 9.8. C) 19.6. D) 39.2. Show Answer Correct Answer: B) 9.8. 20. A car traveling at 90 kilometers/hour when it suddenly stops. The passengers in the car will A) Continue to move in a straight line and will slide forward in the car. B) Come to a stop at the same time the car stops. C) Be pushed against the door on the passenger side. D) Be pushed against the door on the driver's side. Show Answer Correct Answer: A) Continue to move in a straight line and will slide forward in the car. 21. A bus travels 20 km in 30 minutes. What is the average speed of the bus? A) 20 km/h. B) 30 km/h. C) 40 km/h. D) 50 km/h. Show Answer Correct Answer: C) 40 km/h. 22. Define Force? A) Any push on an object is known as force. B) Any pull on an object is known as Force. C) Any push or pull on an object is known as force. D) None of the above. Show Answer Correct Answer: C) Any push or pull on an object is known as force. 23. A change in speed or direction; a change in velocity A) Acceleration. B) Force. C) Inertia. D) Net force. Show Answer Correct Answer: A) Acceleration. 24. Law of conservation of momentum states that the sum of momenta before collision is equal to the sum of momenta after collision provided ..... A) There is no external unbalanced force acting on them. B) There is external unbalanced force acting on them. C) There maybe one external unbalanced force acting on them. D) There might be an external unbalanced force acting on them. Show Answer Correct Answer: A) There is no external unbalanced force acting on them. 25. Law of conservation of momentum A) Friction exist between rough. B) The total momentum remains conserved in an isolated system. C) Momentum area power of motion of an object. D) None of the above. Show Answer Correct Answer: B) The total momentum remains conserved in an isolated system. ← 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 8Class 9 Science Chapter 9 Force And Laws Of Motion Quiz 9Class 9 Science Chapter 9 Force And Laws Of Motion Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books