This quiz works best with JavaScript enabled. Home > Class 9 > Class 9 Science Chapter 9 Force And Laws Of Motion – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 9 Force And Laws Of Motion Quiz 1 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Momentum is related to Newton's first law. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 2. Which law says that for every action there is an equal and opposite reaction? A) Newton's First Law of Motion. B) Newton's Second Law of Motion. C) Newton's Third Law of Motion. D) Newton's Fourth Law of Motion. Show Answer Correct Answer: C) Newton's Third Law of Motion. 3. Two skaters begin at rest. Skater 1 has a smaller mass than Skater 2. After they push off each other, ..... A) Skater 1 experiences a greater change in momentum. B) Skater 1 has a greater velocity than Skater 2. C) Skater 2 experiences a greater change in momentum. D) Skater 1 experiences a greater force. Show Answer Correct Answer: B) Skater 1 has a greater velocity than Skater 2. 4. The inertia of a moving object depends on:i. Mass of the objectii. Momentum of the objectiii. Speed of the object iv. Shape of the objectChoose the correct option: A) (i) and (ii). B) Only (i). C) Only (ii). D) (iii) and (iv). Show Answer Correct Answer: B) Only (i). 5. If an unbalanced force acts on a stationary object, the object will:. A) Remain stationary. B) Move away from the force. C) Accelerate in the direction of the force. D) Accelerate in the opposite direction of the force. Show Answer Correct Answer: C) Accelerate in the direction of the force. 6. What is the product of an objects mass and velocity? A) Momentum. B) Gravity. C) Inertia. D) Weight. Show Answer Correct Answer: A) Momentum. 7. IF A & B ARE TWO OBJECTS WITH MASSES 60 Kg AND 34 Kg RESPECTIVELY, THEN A) A HAS MORE INERTIA THAN B. B) B HAS MORE INERTIA THAN A. C) A & B HAVE SAME INERTIA. D) NONE OF THE TWO HAS INWERTIA. Show Answer Correct Answer: A) A HAS MORE INERTIA THAN B. 8. When a balloon held between the hands is pressed, its shape changes. This happens because: A) Balanced forces act on the balloon. B) Unbalanced forces act on the balloon. C) Frictional forces act on the balloon. D) Gravitational force acts on the balloon. Show Answer Correct Answer: A) Balanced forces act on the balloon. 9. Newton's first law of motion states that: A) An object will remain at rest or in uniform motion unless acted upon by an external force. B) Force is equal to mass times acceleration. C) For every action, there is an equal and opposite reaction. D) Momentum is conserved in a collision. Show Answer Correct Answer: A) An object will remain at rest or in uniform motion unless acted upon by an external force. 10. The speed of a car weighing 1500 Kg increases from 40 m/s to 50 m/s. Calculate the change in its momentum. A) 1500 kg m/s. B) 150 kg m/s. C) 15000 kg m/s. D) 2500 kg m/s. Show Answer Correct Answer: C) 15000 kg m/s. 11. A bag lies on top of a table. Which statement correctly describes the situation? A) The bag exerts no force on the table. B) There are no forces acting on the bag. C) The bag is absolutely at rest in any reference frame. D) There are may forces acting on the bag but they balance each other. Show Answer Correct Answer: D) There are may forces acting on the bag but they balance each other. 12. A water tank filled upto 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) Come to the rest. D) Be unaffected. Show Answer Correct Answer: B) Move forward. 13. Oliver stepped onto a three-car subway train with standing room only. What caused him to fall backward into other riders when the train suddenly moved forward? A) He was riding in the last car of the train. B) He had heat exhaustion from the overcrowded train. C) Oliver's body resisted a change in the subway train's inertia. D) Oliver's body was responding to the force of gravity. Show Answer Correct Answer: C) Oliver's body resisted a change in the subway train's inertia. 14. Which principle is followed in a take off of a rocket? A) Moment of inertia. B) Conservation of momentum. C) Newton's third law of motion. D) Newton's law of gravitation. Show Answer Correct Answer: B) Conservation of momentum. 15. What is the correct equation of second law of motion? A) F = on. B) A = am. C) F = m-a. D) F = m+a. Show Answer Correct Answer: A) F = on. 16. Frictional Force acts in the A) Same direction as motion. B) Opposite direction of motion. C) Friction force is not real. D) All of the above. Show Answer Correct Answer: B) Opposite direction of motion. 17. What is the Force that slows down and gradually stops motion? A) Acceleration. B) Friction. C) Gravity. D) Inertia. Show Answer Correct Answer: B) Friction. 18. The linear momentum of an object is 250 g cm/s. If the velocity of the object is 5 m/s, then the mass of the object is A) 0.5g. B) 0.5kg. C) 5kg. D) 5g. Show Answer Correct Answer: A) 0.5g. 19. The momentum of an object depends upon the object's ..... & ..... A) Size and shape. B) Mass and speed. C) Mass and veloctiy. D) Mass and energy. Show Answer Correct Answer: C) Mass and veloctiy. 20. The SI units for force are ..... A) Kilograms. B) Newtons. C) Meters per second. D) Pounds. Show Answer Correct Answer: B) Newtons. 21. When a carpet is beaten with a stick, dust comes out of it is an example of A) Inertia of rest. B) Inertia of motion. C) Conservation of linear momentum. D) All of these. Show Answer Correct Answer: A) Inertia of rest. 22. RATE OF CHANGE OF MOMENTUM IS EQUAL TO A) ACCELERATION. B) WORK DONE. C) FORCE. D) IMPULSE. Show Answer Correct Answer: C) FORCE. 23. When an object is at rest velocity and acceleration is zero A) Object starts to move. B) Object continues to be at rest. C) Object continues to be at motion. D) None of the option. Show Answer Correct Answer: B) Object continues to be at rest. 24. A cricketer catches a ball of mass 150g in 0.1 s moving with a speed of 20m/s, then he experiences a force of A) 300 N. B) 30 N. C) On. D) 0.3 N. Show Answer Correct Answer: B) 30 N. 25. When we talk about a force acting on a body, it usually means: A) Electrical force. B) Balanced force. C) Unbalanced force. D) Nuclear force. Show Answer Correct Answer: C) Unbalanced force. 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