This quiz works best with JavaScript enabled. Home > Class 9 > Class 9 Science Chapter 9 Force And Laws Of Motion – Quiz 9 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 9 Force And Laws Of Motion Quiz 9 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. 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. 2. 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. 3. A force of 40 N acts upon a 2 kg block. Calculate the acceleration of the object. A) 20 m/s$^{2}$. B) 20 m/s. C) 80 m/s$^{2}$. D) 80 m/s. Show Answer Correct Answer: A) 20 m/s$^{2}$. 4. The inertia of an object tends to cause it A) To increase its speed. B) To decrease its speed. C) To resist a change in its state of motion. D) To decelerate due to friction. Show Answer Correct Answer: C) To resist a change in its state of motion. 5. Who formulated the three laws of motion? A) Albert Einstein. B) Isaac Newton. C) Galileo Galilei. D) Niels Bohr. Show Answer Correct Answer: B) Isaac Newton. 6. 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) Same direction 100N. B) Same direction 200N. C) Opposite direction 100N. D) Opposite direction 200N. Show Answer Correct Answer: C) Opposite direction 100N. 7. A body at rest will come in motion if we apply ..... forces on it. A) Balanced. B) Constant. C) Unbalanced. D) Zero. Show Answer Correct Answer: C) Unbalanced. 8. 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) 62.02 kg. B) 63.69 kg. C) 263.3 kg. D) 1123.5 kg. Show Answer Correct Answer: A) 62.02 kg. 9. If net force on an object is zero. it is considered to be A) At rest. B) Having balanced force. C) Having unbalanced force. D) At motion. Show Answer Correct Answer: B) Having balanced force. 10. Force is a ..... quantity. A) Vector. B) Scalar. C) Neither scalar nor vector. D) Unitless. Show Answer Correct Answer: A) Vector. 11. A person standing in a moving bus suddenly falls forward when the bus stops. This is because: A) The force applied by the road is greater than that by the bus. B) The inertia of motion keeps the upper body moving forward while the lower body stops with the bus. C) The acceleration of the bus is greater than that of the person. 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. 12. 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. 13. If no external force acts on a body, it will A) Move with more speed. B) Change its shape. C) Break into pieces. D) Either remain in its state of rest or uniform motion. Show Answer Correct Answer: D) Either remain in its state of rest or uniform motion. 14. 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. 15. What is the change in velocity divided by time? A) Momentum. B) Force. C) Speed. D) Acceleration. Show Answer Correct Answer: D) Acceleration. 16. 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 first law. B) Newton's second law. C) Newton's third law. D) Conservation of momentum. Show Answer Correct Answer: B) Newton's second law. 17. A hockey puck sliding across the ice is an example of this type of friction. A) Air Resistance. B) Sliding. C) Rolling. D) Static. Show Answer Correct Answer: B) Sliding. 18. 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. 19. 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. 20. 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) 24 N. B) 28 N. C) 32 N. D) 10 N. Show Answer Correct Answer: A) 24 N. 21. The Law of Conservation of Momentum states: A) The total momentum before a collision is equal to the total momentum after a collision. B) The total momentum before a collision is greater than the total momentum after a collision. C) The total momentum before a collision is less than 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: A) The total momentum before a collision is equal to the total momentum after a collision. 22. IF THE MASS OF A BODY IS DOUBLED, ITS ACCELERATION WILL BE (IF APPLIED FORCE REMAINS THE SAME) A) BECOMES DOUBLE. B) NOT CHANGE. C) BECOMES HALF. D) Becomes four times. Show Answer Correct Answer: C) BECOMES HALF. 23. A CANON AFTER FIRING RECOILS DUE TO A) CONSERVATION OF ENERGY. B) BACKWARD THRUST OF GASES. C) NEWTON'S THIRD LAW OF MOTION. D) NEWTON'S FIRST LAW OF MOTION. Show Answer Correct Answer: C) NEWTON'S THIRD LAW OF MOTION. 24. Newton's second law states that greater the mass the more ..... will be needed to move the object. A) Power. B) Force. C) Distance. D) Speed. Show Answer Correct Answer: B) Force. 25. Passengers standing in a bus are thrown outwards when the bus takes a turn suddenly. This happens because of A) Outward pull on them. B) Inertia. C) Change in motion. D) Change in acceleration. Show Answer Correct Answer: B) Inertia. ← 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 10Class 9 Science Chapter 9 Force And Laws Of Motion Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books