Home » MCQ on Class 9 Science Chapter 8: Force And Laws Of Motion

MCQ on Class 9 Science Chapter 8: Force And Laws Of Motion

By Abdur Rohman / June 22, 2024

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Chapter 8 of class 9 science as per the NCERT syllabus is Force And Laws Of Motion which deals with Balanced and Unbalanced Forces, First Law of Motion, Inertia and Mass, Second Law of Motion, Third Law of Motion, etc.

Here, we have discussed 30 Multiple Choice Questions based on these topics of the chapter. These questions will help you to learn more about the chapter and test your knowledge.

For each question below, there are four options out of which only one option is correct. After selecting your answer, click on the submit button to see the score and review your answers.

MCQ on Class 9 Science Chapter 8

1. What term describes the natural state of an object at rest according to early scientists?

A. Motion B. Inertia C. Rest D. Equilibrium

2. If a marble is released on a frictionless inclined plane, what will it do according to Galileo?

A. Roll indefinitely B. Come to a stop C. Roll and then stop D. Roll back to its original height

3. What causes a ball to eventually stop when rolled on the ground?

A. Its weight B. Friction C. Gravity D. Air resistance

4. What is the effect of balanced forces on an object?

A. Change in motion B. Change in shape C. No change in state D. Change in direction

5. What happens to an object in motion if no unbalanced force acts on it?

A. It stops B. It speeds up C. It changes direction D. It continues moving at constant speed

6. Which of the following can a force change in an object?

A. Only its speed B. Speed and direction C. Only its direction D. Neither speed nor direction

7. What is inertia?

A. The tendency to change motion B. The resistance to change in motion C. The force acting on an object D. The speed of an object

8. According to Newton’s first law, what will happen to an object at rest if no external force acts on it?

A. It will start moving B. It will remain at rest C. It will change direction D. It will accelerate

9. What happens when an unbalanced force is applied to an object?

A. It accelerates B. It stays at rest C. It slows down D. It deforms

10. What is the unit of force in the SI system?

A. Joule B. Newton C. Kilogram D. Meter

11. Who formulated the three fundamental laws of motion?

A. Isaac Newton B. Albert Einstein C. Galileo Galilei D. James Clerk Maxwell

12. What is the relationship between mass and inertia?

A. Inertia is independent of mass B. Inertia decreases with mass C. Inertia increases with mass D. Inertia is equal to mass

13. What is required to change the velocity of an object according to the second law of motion?

A. Balanced force B. No force C. Unbalanced force D. Frictional force

14. What does the second law of motion state about force and momentum?

A. Force is proportional to the rate of change of momentum B. Force is inversely proportional to the rate of change of momentum C. Force is equal to momentum D. Force is independent of momentum

15. What is the unit of momentum?

A. Newton B. kg m/s C. Joule D. Watt

16. What happens when a fast-moving cricket ball is caught by a fielder?

A. The ball gains speed B. The fielder pulls his hands backward C. The ball remains in the air D. The ball slows down immediately

17. According to Newton’s third law, what happens when you push a wall?

A. The wall moves B. Nothing happens C. The wall pushes back with equal force D. The wall breaks

18. What happens to the acceleration of an object if the force applied to it is doubled?

A. The acceleration doubles B. The acceleration is halved C. The acceleration remains the same D. The acceleration quadruples

19. If a truck and a car have the same velocity, which one has more momentum?

A. The car B. The truck C. Both have the same momentum D. None of the above

20. What is the effect of friction on a moving object?

A. Speeds up the object B. Changes its direction C. Keeps its speed constant D. Slows down the object

21. Why does a boat move backward when a sailor jumps forward?

A. The boat is light B. Action and reaction forces C. Lack of friction D. Due to the weight of the sailor

22. What do safety belts in cars provide in case of a sudden stop?

A. Comfort B. Safety C. Speed D. Direction

23. What is the direction of momentum?

A. Opposite to velocity B. Perpendicular to velocity C. Same as velocity D. Independent of velocity

24. Why do passengers lurch forward when a bus suddenly stops?

A. Due to balanced forces B. Due to friction C. Due to inertia D. Due to acceleration

25. How can the effect of friction be minimized?

A. By increasing mass B. By using lubricants C. By using rough surfaces D. By applying more force

26. Which law states that the acceleration of an object is directly proportional to the net force acting on it?

A. Newton’s First Law B. Newton’s Second Law C. Newton’s Third Law D. Law of Inertia

27. What happens to a marble released from rest on a double inclined plane with equal inclinations?

A. It stops at the bottom B. It climbs up one side and stops C. It climbs up the opposite side to the same height D. It rolls indefinitely

28. What property of an object resists changes in its state of motion?

A. Force B. Velocity C. Inertia D. Acceleration

29. How is force related to the change in momentum according to Newton’s second law?

A. Force is proportional to the rate of change of momentum B. Force is inversely proportional to the rate of change of momentum C. Force is equal to momentum D. Force is independent of momentum

30. When you step out of a boat onto the shore, why does the boat move backward?

A. Due to inertia B. Due to friction C. Due to gravity D. Due to action and reaction forces

Review Your Answers Above

The Bottom Line

I hope these 30 MCQs on Force And Laws Of Motion of Class 9 Science Chapter 8 have helped you in your studies and preparation.

If you have any queries, or comments or find any mistake in the above questions, feel free to contact me in the comment section below.

I would love to hear from you.

Abdur Rohman

Abdur Rohman is an Electrical Engineer from Charaideo, Assam, who wears multiple hats as a part-time teacher, blogger, entrepreneur, and digital marketer. Passionate about education, he founded The Assam School blog to provide free, comprehensive textbook solutions, MCQs (Multiple Choice Questions), and other academic content for students from Class V to XII.

MCQ on Class 9 Science Chapter 8

1. What term describes the natural state of an object at rest according to early scientists?

2. If a marble is released on a frictionless inclined plane, what will it do according to Galileo?

3. What causes a ball to eventually stop when rolled on the ground?

4. What is the effect of balanced forces on an object?

5. What happens to an object in motion if no unbalanced force acts on it?

6. Which of the following can a force change in an object?

7. What is inertia?

8. According to Newton’s first law, what will happen to an object at rest if no external force acts on it?

9. What happens when an unbalanced force is applied to an object?

10. What is the unit of force in the SI system?

11. Who formulated the three fundamental laws of motion?

12. What is the relationship between mass and inertia?

13. What is required to change the velocity of an object according to the second law of motion?

14. What does the second law of motion state about force and momentum?

15. What is the unit of momentum?

16. What happens when a fast-moving cricket ball is caught by a fielder?

17. According to Newton’s third law, what happens when you push a wall?

18. What happens to the acceleration of an object if the force applied to it is doubled?

19. If a truck and a car have the same velocity, which one has more momentum?

20. What is the effect of friction on a moving object?

21. Why does a boat move backward when a sailor jumps forward?

22. What do safety belts in cars provide in case of a sudden stop?

23. What is the direction of momentum?

24. Why do passengers lurch forward when a bus suddenly stops?

25. How can the effect of friction be minimized?

26. Which law states that the acceleration of an object is directly proportional to the net force acting on it?

27. What happens to a marble released from rest on a double inclined plane with equal inclinations?

28. What property of an object resists changes in its state of motion?

29. How is force related to the change in momentum according to Newton’s second law?

30. When you step out of a boat onto the shore, why does the boat move backward?

The Bottom Line

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