This quiz works best with JavaScript enabled. Home > Cbse > Class 9 > Science > Force And Laws Of Motion > Class 9 Science Chapter 9 Force And Laws Of Motion – Quiz 6 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 9 Force And Laws Of Motion Quiz 6 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Force cannot change the velocity of an object. A) TRUE. B) FALSE. C) Only in some cases. D) None of the above. Show Answer Correct Answer: B) FALSE. 2. A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. This enables the goalkeeper to A) Exert larger force on the ball. B) Reduce the force exerted by the balls on the hands. C) Increase the rate of change of momentum. D) Decrease the rate of change of momentum. Show Answer Correct Answer: D) Decrease the rate of change of momentum. 3. A batsman hits a cricket ball which then rolls on a level ground after covering a short distance the ball comes to rest the ball close to stop because A) The batsman did not hit the ball hard enough. B) Velocity is proportional to the force exerted on the ball. C) There is a force on the ball opposing the motion. D) There is no unbalanced force on the ball so the ball would come to rest. Show Answer Correct Answer: C) There is a force on the ball opposing the motion. 4. Law of conservation of momentum states that the sum of momenta before a collision is equal to the sum of momenta after the collision provided ..... A) There is an external unbalanced force acting on them. B) There may be one external unbalanced force acting on them. C) There might be an external unbalanced force acting on them. D) There is no external unbalanced force acting on them. Show Answer Correct Answer: D) There is no external unbalanced force acting on them. 5. Which of these is an example of Newton's First Law, inertia? A) Pushing against a brick wall, and the brick wall does not move. B) Pushing against a stationary wheelbarrow, and the wheelbarrow accelerates forward. C) Pushing a wheelbarrow full of bricks, and the bricks slide back toward the handles. D) Pushing a wagon to the top of a hill, and the wagon to the top of hill and the wagon accelerates down the hill without assistance. Show Answer Correct Answer: C) Pushing a wheelbarrow full of bricks, and the bricks slide back toward the handles. 6. The Law of Conservation states:Without an ..... momentum of a system remains ..... A) Internal force; unchanged. B) External force; the same. C) Internal force; the same. D) External force; unchanged. Show Answer Correct Answer: D) External force; unchanged. 7. A passenger in a moving train tosses a coin which falls behind him. Observing this statement what can you say about the motion of the train? A) Along circular tracks. B) Uniform. C) Accelerated. D) Retarded. Show Answer Correct Answer: C) Accelerated. 8. If a 6 kg bowling ball is thrown with 28 N of force, how fast will it accelerate? A) 4.67 m/s$^{2}$. B) 0.21 m/s$^{2}$. C) 168 m/s$^{2}$. D) None of the above. Show Answer Correct Answer: A) 4.67 m/s$^{2}$. 9. A person force falling on a cemented floor get injured but a person falling on a heap of sand is not injured. Which law is used here? 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. 10. When the force on a car is doubled, the acceleration is A) Worse. B) Doubled. C) Remains same. D) None of the above. Show Answer Correct Answer: B) Doubled. 11. If net force acting on object is 0, then the force is considered to be ..... A) Equal in Direction. B) Distance/Time. C) Balanced. D) Unbalanced. Show Answer Correct Answer: C) Balanced. 12. When a bus suddenly takes a turn, the passengers are thrown outwards because of A) Inertia of direction. B) Acceleration of motion. C) Speed of motion. D) Both (b) and (c). Show Answer Correct Answer: A) Inertia of direction. 13. SI unit of impulse is ..... A) N. B) N.M. C) M/S. D) KG.M/S. Show Answer Correct Answer: B) N.M. 14. A ship of mass 3 x 10$^{7}$ kg initially at rest is pulled by a force of 5 x 10$^{4}$ N through a distance of 3 m. The speed of the ship is A) 0.1 m s$^{-1}$. B) 1.5 m s$^{-1}$. C) 60 m s$^{-1}$. D) 5 m s$^{-1}$. Show Answer Correct Answer: A) 0.1 m s$^{-1}$. 15. Force of friction always acts in the direction A) Of applied force. B) Opposite to the direction of applied force. C) At right angles to the direction of force. D) None of the above. Show Answer Correct Answer: B) Opposite to the direction of applied force. 16. WHAT ARE DIFFERENT TYPES OF INERTIA A) INERTIA OF REST. B) INERTIA OF MOTION. C) INERTIA OF DIRECTION. D) ALL OF THESE. Show Answer Correct Answer: D) ALL OF THESE. 17. Newton's third law states ..... A) For each action there is a larger reaction associated with it. B) None of these choices. C) For each action there is an equal and opposite reaction. D) For each action there is a smaller reaction associated with it. Show Answer Correct Answer: C) For each action there is an equal and opposite reaction. 18. If an object has a small mass, it wouldn't need as strong of a force to accelerate it. Which law does this describe? A) Newton's 1st Law. B) Newton's 3rd Law. C) Newton's 4th Law. D) Newton's 2nd Law. Show Answer Correct Answer: D) Newton's 2nd Law. 19. 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. 20. If you increase the mass on an object, its acceleration A) Stops. B) Decreases. C) Stays the same. D) Also increases. Show Answer Correct Answer: B) Decreases. 21. 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. 22. The equation to calculate momentum is A) P=1/2mv$^{2}$. B) P=mgh. C) P=mv. D) P=mg. Show Answer Correct Answer: C) P=mv. 23. Which law of motion is also called law of inertia? A) Law 2. B) Not mentioned. C) Law 1. D) Law 3. Show Answer Correct Answer: C) Law 1. 24. INERTIA IS DIRECTLY PROPORTIONAL TO ..... A) MASS. B) FORCE. C) MOMENTUM. D) ALL. Show Answer Correct Answer: A) MASS. 25. 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. 26. 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. 27. 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. 28. 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. 29. 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. 30. 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. 31. 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. 32. 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) 2:1. B) 1:2. C) 4:1. D) 1:4. Show Answer Correct Answer: B) 1:2. 33. 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 forward. B) Rise upwards. C) Move backward. D) Be unaffected. Show Answer Correct Answer: A) Move forward. 34. What is the standard unit force is measured in? A) Grams. B) Newtons. C) Meters. D) Pounds. Show Answer Correct Answer: B) Newtons. 35. A force of magnitude 'F' Acts on a body of mass 'm'.The acceleration of the body depends upon A) Mass of body. B) Volume of body. C) Density of body. D) Area of body. Show Answer Correct Answer: A) Mass of body. 36. Area under a v-t graph represents a physical quantity which has the unit A) M. B) M s$^{-1}$. C) M$^{3}$. D) M$^{2 }$. Show Answer Correct Answer: A) M. 37. Acceleration due to gravity, g, is ..... m/sec2. A) 19.6. B) 39.2. C) 4.9. D) 9.8. Show Answer Correct Answer: D) 9.8. 38. 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. 39. A bus travels 20 km in 30 minutes. What is the average speed of the bus? A) 40 km/h. B) 30 km/h. C) 50 km/h. D) 20 km/h. Show Answer Correct Answer: A) 40 km/h. 40. A change in speed or direction; a change in velocity A) Force. B) Acceleration. C) Net force. D) Inertia. Show Answer Correct Answer: B) Acceleration. 41. 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. 42. In a rocket, fuel burns at the rate of 1 kg/s. This fuel is ejected from the rocket with a velocity of 60 km/s. This exerts a force on the rocket equal to A) 600 N. B) 60000 N. C) 6000 N. D) 60 N. Show Answer Correct Answer: B) 60000 N. 43. In the equation F = ma, what does 'a' represent? A) Acceleration. B) Mass. C) Force. D) Velocity. Show Answer Correct Answer: A) Acceleration. 44. A person is standing in an elevator. In which situation he finds his weight less than actual when A) The elevator moves downward with constant acceleration. B) The elevator moves upward with constant acceleration. C) The elevator moves upward with uniform velocity. D) The elevator moves downward with uniform velocity. Show Answer Correct Answer: A) The elevator moves downward with constant acceleration. 45. A force produces an acceleration 5 cm/s$^{2}$ when it acts on a body of 20 g. Find the force acting on the body. A) 0.005 N. B) 0.004 N. C) 0.001 N. D) 0.002 N. Show Answer Correct Answer: C) 0.001 N. 46. When the resultant of the forces acting on the body is zero, these are called A) Balanced force. B) Unbalanced force. C) Both. D) None of the above. Show Answer Correct Answer: A) Balanced force. 47. If an action force is a cue ball (white) hitting a billiard ball (various colors) when playing pool, then the reaction force is A) Exerted on the table. B) Not present. C) Exerted by the billiard ball on the cue ball. D) Exerted on all the other billiard balls. Show Answer Correct Answer: D) Exerted on all the other billiard balls. 48. What is the acceleration of an object that takes 20 seconds to change from a speed of 200 meters/second to 300 meters/second? A) 100 m/s squared. B) 5 m/s. C) 100 m/s. D) 5 m/s squared. Show Answer Correct Answer: D) 5 m/s squared. 49. The force of an object, with a certain mass accelerating at a certain rate, can be determined by using the equation below. force = mass x accelerationWhich object would have the greatest force? A) A 5 kg object accelerating at 20 m/s. B) A 5 kg object accelerating at 10 m/s. C) A 20 kg object accelerating at 4 m/s. D) A 20 kg object accelerating at 3 m/s. Show Answer Correct Answer: A) A 5 kg object accelerating at 20 m/s. 50. Which of the following best describes the velocity of an object? A) 30 m/s$^{2}$. B) 30 m/s. C) 30 m East. D) 30 m/s East. Show Answer Correct Answer: D) 30 m/s East. 51. Newton's first law of motion says that a moving body should continue to move forever, unless some external forces act on it. But a moving cycle comes to rest after some time if we stop pedaling it. Can you choose the correct reason for the stoppage of cycle?i. Air resistanceii. Gravitational pull of the earthiii. Friction of the road iii. Heat of the environmentChoose the correct option: A) (iii) and (iv). B) (i) and (iii). C) (i) and (ii). D) (ii) and (iii). Show Answer Correct Answer: B) (i) and (iii). 52. The seat belts are provided in the cars so that if the car stops suddenly due to an emergency braking, the persons sitting on the front seats are not thrown forward violently and saved from getting injured. Can you guess the law due to which a person falls in forward direction on the sudden stopping of the car? A) Newton's first law of motion. B) Newton's second law of motion. C) Newton's law of gravitation. D) Newton's third law of motion. Show Answer Correct Answer: A) Newton's first law of motion. 53. Swimming can be explained by A) Newton's law of gravitation. B) Third law of motion. C) Second law of motion. D) First law of motion. Show Answer Correct Answer: B) Third law of motion. 54. Speed is different from velocity because A) Velocity doesn't include distance. B) Velocity doesn't include time. C) Speed uses Distance /Time. D) Velocity has a direction. Show Answer Correct Answer: D) Velocity has a direction. 55. The velocity of a body of mass 20 kg decreases from 20 m/s to 5 m/s in a distance of 100 m. Force on the body is A) -27.5 N. B) -37.5 N. C) -47.5 N. D) -67.5 N. Show Answer Correct Answer: B) -37.5 N. 56. A constant retarding force of 80 N is applied to a body of mass 50 kg which is moving initially with a speed of 20 m/s. What would be the time required by the body to come to rest? A) 18 s. B) 12.5 s. C) 15 s. D) 14 s. Show Answer Correct Answer: B) 12.5 s. 57. Which has more momentum? A) Rolling a bowling ball with a large mass and low velocity. B) Throwing a baseball with a small mass and a high velocity. C) They have the same. D) None of the above. Show Answer Correct Answer: C) They have the same. 58. Newton's first law of motion is also called Galileo's law of: A) Conservation of mass. B) Friction. C) Conservation of momentum. D) Inertia. Show Answer Correct Answer: D) Inertia. 59. A 10-kg brick and a 1-kg book are dropped in a vacuum. The force of gravity on the 10-kg brick is A) 10 times as much as the force on the 1-kg book. B) Zero. C) The same as the force on the 1-kg book. D) None of the above. Show Answer Correct Answer: A) 10 times as much as the force on the 1-kg book. 60. How does acceleration of an object change relation to its mass? It is A) Directly proportional. B) Inversely proportional. C) Acceleration doesn't depend on mass at all. D) Directly to square root. Show Answer Correct Answer: B) Inversely proportional. ← PreviousNext →Related QuizzesScience QuizzesClass 9 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 7 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books