Class 9 Science upendersingha@gmail.com September 6, 2024 0 Comments Forces and Laws of Motion NCERT Class 9 Science – Force and Laws of Motion: Extended Multiple Choice Questions NCERT Class 9 Science – Force and Laws of Motion: Extended Multiple Choice Questions 1. Which of Newton’s laws is also known as the law of inertia? a) First law b) Second law c) Third law d) Fourth law 2. What does Newton’s Second Law relate to? a) Speed b) Force c) Momentum d) All of the above 3. What is the formula for calculating weight? a) W = mg b) W = m/v c) W = F/m d) W = F/v 4. What type of friction occurs between stationary objects? a) Kinetic friction b) Static friction c) Sliding friction d) Rolling friction 5. Which law can be demonstrated using a rocket? a) First law b) Second law c) Third law d) All of the above 6. What is the SI unit of force? a) Joule b) Newton c) Pascal d) Watt 7. Which of the following is an example of balanced forces? a) A book resting on a table b) A car accelerating c) A person jumping d) A ball rolling down a hill 8. What is the momentum of an object with mass 2 kg moving at a velocity of 5 m/s? a) 2 kg m/s b) 5 kg m/s c) 7 kg m/s d) 10 kg m/s 9. According to Newton’s Third Law, action and reaction forces are: a) Always balanced b) Always unbalanced c) Equal in magnitude and opposite in direction d) Equal in magnitude and same in direction 10. What is the acceleration of an object with mass 5 kg when a force of 10 N is applied to it? a) 0.5 m/s² b) 2 m/s² c) 5 m/s² d) 10 m/s² 11. Which of the following is NOT a contact force? a) Friction b) Tension c) Normal force d) Gravitational force 12. What happens to the acceleration of an object if the force applied to it is doubled and its mass is halved? a) It remains the same b) It doubles c) It quadruples d) It becomes half 13. Which of the following is an example of inertia? a) A car accelerating b) A ball rolling down a hill c) Passengers moving forward when a bus stops suddenly d) A book sliding on a table 14. What is the relationship between mass and inertia? a) Mass is inversely proportional to inertia b) Mass is directly proportional to inertia c) Mass and inertia are unrelated d) Mass is the square of inertia 15. In the equation F = ma, what does ‘a’ represent? a) Area b) Acceleration c) Altitude d) Amplitude Submit Reset ↑
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