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 4 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 9 Force And Laws Of Motion Quiz 4 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which has more inertia ..... A) Ant. B) Skateboard. C) Cat. D) Truck. Show Answer Correct Answer: D) Truck. 2. 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. 3. 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. 4. 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. 5. A man is standing on a boat in still water. If he walks towards the shore, the boat will A) Remain stationary. B) Move towards the shore. C) Move away from the shore. D) Sink. Show Answer Correct Answer: C) Move away from the shore. 6. 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. 7. 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. 8. 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. 9. 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. 10. When a 12 N force acts on 3 kg mass for a second, the change in velocity is (in m/s) A) 36. B) 8. C) 4. D) 2. Show Answer Correct Answer: C) 4. 11. 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) Opposite forces. B) Equal forces. C) Unbalanced forces. D) Balanced forces. Show Answer Correct Answer: A) Opposite forces. 12. 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. 13. 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. 14. Which factor affects inertia A) Velocity. B) Acceleration. C) Force. D) Mass. Show Answer Correct Answer: D) Mass. 15. What is a PUSH or PULL of an object? A) Force. B) Gravity. C) Friction. D) Motion. Show Answer Correct Answer: A) Force. 16. Objects with greater Inertia have greater A) Intelligence. B) Mass. C) Force. D) None of the above. Show Answer Correct Answer: B) Mass. 17. 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. 18. Direction of momentum is direction of ..... A) Velocity. B) Speed. C) Force. D) Accelaration. Show Answer Correct Answer: A) Velocity. 19. 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. 20. When we vigrously a shake branch of a tree, some leaves get detached.It is due to the A) Inertia of rest. B) Inertia of motion. C) Some leaves are loosely held by the branch. D) None of the above. Show Answer Correct Answer: A) Inertia of rest. 21. The second law of motion gives the relationship between: A) Force and velocity. B) Force and acceleration. C) Acceleration and momentum. D) Momentum and mass. Show Answer Correct Answer: B) Force and acceleration. 22. A force of 40 N acts upon a 2 kg block. Calculate the acceleration of the object. A) 80 m/s. B) 20 m/s. C) 80 m/s$^{2}$. D) 20 m/s$^{2}$. Show Answer Correct Answer: D) 20 m/s$^{2}$. 23. The inertia of an object tends to cause it A) To decelerate due to friction. B) To resist a change in its state of motion. C) To decrease its speed. D) To increase its speed. Show Answer Correct Answer: B) To resist a change in its state of motion. 24. Who formulated the three laws of motion? A) Albert Einstein. B) Niels Bohr. C) Galileo Galilei. D) Isaac Newton. Show Answer Correct Answer: D) Isaac Newton. 25. A baseball bat hits a baseball with a force of 100 Newtons. What is the force and its direction exerted by the ball on the bat? A) Opposite direction 200N. B) Same direction 200N. C) Opposite direction 100N. D) Same direction 100N. Show Answer Correct Answer: C) Opposite direction 100N. 26. A body at rest will come in motion if we apply ..... forces on it. A) Constant. B) Zero. C) Balanced. D) Unbalanced. Show Answer Correct Answer: D) Unbalanced. 27. A 260.5N unbalanced force applied to push a chair across the room causing an acceleration of 4.2 m/s$^{2}$. What is the mass of the chair? A) 63.69 kg. B) 263.3 kg. C) 1123.5 kg. D) 62.02 kg. Show Answer Correct Answer: D) 62.02 kg. 28. If net force on an object is zero. it is considered to be A) Having balanced force. B) At motion. C) Having unbalanced force. D) At rest. Show Answer Correct Answer: A) Having balanced force. 29. Force is a ..... quantity. A) Unitless. B) Vector. C) Neither scalar nor vector. D) Scalar. Show Answer Correct Answer: B) Vector. 30. A person standing in a moving bus suddenly falls forward when the bus stops. This is because: A) The acceleration of the bus is greater than that of the person. B) The inertia of motion keeps the upper body moving forward while the lower body stops with the bus. C) The force applied by the road is greater than that by the bus. D) The person applies a force on the bus in the forward direction. Show Answer Correct Answer: B) The inertia of motion keeps the upper body moving forward while the lower body stops with the bus. 31. More massive objects have less inertia A) True. B) False. C) None of these. D) Mass and inertia are not related. Show Answer Correct Answer: B) False. 32. If no external force acts on a body, it will A) Break into pieces. B) Move with more speed. C) Either remain in its state of rest or uniform motion. D) Change its shape. Show Answer Correct Answer: C) Either remain in its state of rest or uniform motion. 33. People sitting in a moving bus experience a jerk when the bus stops. This is because of ..... A) Inertia of rest. B) Inertia of motion. C) Frictional force. D) All of these. Show Answer Correct Answer: B) Inertia of motion. 34. What is the change in velocity divided by time? A) Momentum. B) Speed. C) Force. D) Acceleration. Show Answer Correct Answer: D) Acceleration. 35. An empty truck and a fully loaded truck are next to each other at a traffic light. When the light turns green, the lighter truck increases speed more quickly. Which of these best explains this situations A) Newton's second law. B) Newton's first law. C) Conservation of momentum. D) Newton's third law. Show Answer Correct Answer: A) Newton's second law. 36. A hockey puck sliding across the ice is an example of this type of friction. A) Sliding. B) Static. C) Air Resistance. D) Rolling. Show Answer Correct Answer: A) Sliding. 37. Among the equal-sized stone and a football, the inertia will be higher of: A) Football. B) Stone. C) Both. D) None of them. Show Answer Correct Answer: B) Stone. 38. Which law of motion is associated with the conservation of momentum? A) Newton's first law of motion. B) Newton's second law of motion. C) Newton's third law of motion. D) None of the above. Show Answer Correct Answer: C) Newton's third law of motion. 39. A gun of mass 1 kg fires 4 bullets per second each of mass 20 g with a velocity 300 m/s. The force required to hold the gun is A) 32 N. B) 10 N. C) 24 N. D) 28 N. Show Answer Correct Answer: C) 24 N. 40. The Law of Conservation of Momentum states: A) The total momentum before a collision is greater than the total momentum after a collision. B) The total momentum before a collision is less than the total momentum after a collision. C) The total momentum before a collision is equal to the total momentum after a collision. D) The total momentum before a collision is not related to the total momentum after a collision. Show Answer Correct Answer: C) The total momentum before a collision is equal to the total momentum after a collision. 41. IF THE MASS OF A BODY IS DOUBLED, ITS ACCELERATION WILL BE (IF APPLIED FORCE REMAINS THE SAME) A) BECOMES HALF. B) Becomes four times. C) BECOMES DOUBLE. D) NOT CHANGE. Show Answer Correct Answer: A) BECOMES HALF. 42. A CANON AFTER FIRING RECOILS DUE TO A) NEWTON'S FIRST LAW OF MOTION. B) BACKWARD THRUST OF GASES. C) CONSERVATION OF ENERGY. D) NEWTON'S THIRD LAW OF MOTION. Show Answer Correct Answer: D) NEWTON'S THIRD LAW OF MOTION. 43. Newton's second law states that greater the mass the more ..... will be needed to move the object. A) Force. B) Power. C) Distance. D) Speed. Show Answer Correct Answer: A) Force. 44. Passengers standing in a bus are thrown outwards when the bus takes a turn suddenly. This happens because of A) Inertia. B) Change in motion. C) Change in acceleration. D) Outward pull on them. Show Answer Correct Answer: A) Inertia. 45. What causes the motion of a body which is initially in the state of rest? A) Acceleration. B) Force. C) Displacement. D) Speed. Show Answer Correct Answer: B) Force. 46. What is the formula for calculating Momentum? A) P=mgh. B) P=Fv. C) P = at. D) P=mv. Show Answer Correct Answer: D) P=mv. 47. What formula is used to calculate force? A) Force = Mass x Acceleration. B) Mass = Force + Acceleration. C) Acceleration = Force x Mass. D) Work = Force x Distance. Show Answer Correct Answer: A) Force = Mass x Acceleration. 48. WHAT IS NEWTON'S THIRD LAW OF MOTION A) FOR EVERY ACTION THERE IS AN EQUAL AND OPPOSITE REACTION. B) IT STATES THAT THE RATE OF CHANGE OF MOMENTUM OF AN OBJECT IS DIRECTLY PROPORTIONAL TO THE APPLIED UNBALANCED FORCE. C) BOTH I AND II. D) NONE OF THESE. Show Answer Correct Answer: A) FOR EVERY ACTION THERE IS AN EQUAL AND OPPOSITE REACTION. 49. Newton's ..... Law of Motion means that for every force there is a reaction force that is equal in size, but opposite in direction. A) Second. B) Fourth. C) Third. D) First. Show Answer Correct Answer: C) Third. 50. Force is defined as: A) A hulk smash. B) A push. C) A push or a pull. D) None of the above. Show Answer Correct Answer: C) A push or a pull. 51. Momentum is a ..... quantity A) Scalar. B) Vector. C) All the above. D) None of the above. Show Answer Correct Answer: B) Vector. 52. In the following example, try to identify the number of times the velocity of ball changes: "A football player kicks a football to another player of his team who kicks the football towards the goal. The goalkeeper of the opposite team collects the football and kicks it towards a player of his own team." A) Five times. B) Four times. C) Three times. D) Six times. Show Answer Correct Answer: C) Three times. 53. STONE, 50 G OF WOOD WHICH ONE HAVING MORE INERTIA ..... A) STONE. B) WOOD. C) BOTH A AND B. D) NOINE OF THESE. Show Answer Correct Answer: A) STONE. 54. Only one force can act on an object at a time. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 55. Force required in accelerating a 3 kg mass at 5 m/s$^{2 }$and a 4 kg mass at 4 m/s$^{2}$, will be A) Zero in both the cases. B) Same in both the cases. C) Greater for 3 kg mass at 5 m/s$^{2}$. D) Greater for 4 kg mass at 4 m/s$^{2}$. Show Answer Correct Answer: D) Greater for 4 kg mass at 4 m/s$^{2}$. 56. WHEN A NET FORCE ACTS ON AN OBJECT WILL BE ACCELERATED IN THE DIRECTION OF THE FORCE WITH ACCELERATION INVERSELY PROPORTIONAL TO A) THE FORCE ON THE OBJECT. B) THE INERTIA OF THE OBJECT. C) THE VELOCITY OF THE OBJECT. D) THE MASS OF THE OBJECT. Show Answer Correct Answer: D) THE MASS OF THE OBJECT. 57. In cricket the fielder while making a catch gradually pulls his hands backwards with moving ball. This is an application of A) Newton's First Law of Motion. B) Newton's Second Law of Motion. C) Newton's Third Law of Motion. D) None of these. Show Answer Correct Answer: B) Newton's Second Law of Motion. 58. A book weighs 4 N. When held at rest in your hands, the net force on the book is A) 4 N. B) 0 N. C) 0.4 N. D) 39 N. Show Answer Correct Answer: B) 0 N. 59. Newton's second law gives the measure of A) Force. B) Displacement. C) Acceleration. D) Momentum. Show Answer Correct Answer: A) Force. 60. Acceleration is caused by a force acting on a mass. A) Newton's first law of motion. B) Newton's second law of motion. C) Newton's third law of motion. D) None of the above. Show Answer Correct Answer: B) Newton's second law of motion. ← 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 5Class 9 Science Chapter 9 Force And Laws Of Motion Quiz 6Class 9 Science Chapter 9 Force And Laws Of Motion Quiz 7 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books