SEBA Class 9 Science Chapter 9 Force and Laws of Motion MCQs (2026–27) – Assam Eduverse
Strengthen your understanding of mechanics with SEBA Class 9 Science Chapter 9 Force and Laws of Motion MCQs (2026–27), developed according to the latest ASSEB syllabus and current board exam pattern. These SEBA Class 9 Science Chapter 9 Force and Laws of Motion MCQs include conceptual objective questions, numerical-based MCQs, and application-focused sets to support effective exam preparation.
Prepared by Assam Eduverse subject experts, these SEBA Class 9 Science Chapter 9 MCQs cover important topics such as balanced and unbalanced forces, Newton’s laws of motion, inertia, momentum, conservation of momentum, and real-life applications of force. Practicing these Force and Laws of Motion MCQs Class 9 SEBA and Assam Board Class 9 Science objective questions helps improve conceptual clarity and numerical accuracy. You can also explore more practice from Class 9 Science chapterwise MCQs and SEBA Class 9 MCQs.
Consistent revision of these ASSEB Class 9 Science Important MCQs will boost confidence and exam performance. For detailed explanations, visit SEBA Class 9 Science Chapter 9 Force and Laws of Motion Solutions, or explore additional resources like SEBA Class 9 & 10 study materials and SEBA Class 9 syllabus.
SEBA Class 9 Science Chapter 9 Force and Laws of Motion MCQs – ASSEB 2026–27 Board Exam Practice
Table of Contents
Before You Start
Test your knowledge with the SEBA Class 9 Science MCQs Quiz. Read each question carefully and select the correct answer. Your answer is checked instantly after you choose an option, and a detailed explanation appears immediately to help you learn every concept and improve your exam preparation.
Which of the following physical quantities is capable of changing the state of rest or uniform motion of an object?
✅ Correct Answer
Concept Explanation
A force is a push or a pull acting upon an object resulting from its interaction with another object. While an object's mass resists changes to its motion, only an external unbalanced force can alter its speed, bring it to rest, or change its direction of travel.
Assertion (A): A moving object will continue to drift with a completely uniform velocity if the net unbalanced external force acting on it is zero.
Reason (R): According to Newton's first law of motion, an object inherently resists any change to its current state of rest or uniform motion.
✅ Correct Answer
Concept Explanation
Newton's first law of motion (the Law of Inertia) establishes that a body cannot spontaneously modify its state of motion. If all forces acting on a moving object are perfectly balanced, there is no net external cause to slow it down or speed it up, so it continues moving with a constant velocity. The reason directly explains the assertion.
When two forces of perfectly equal magnitude act on an object in exactly opposite directions, the object will:
✅ Correct Answer
Concept Explanation
When equal and opposite forces act on a body, they constitute balanced forces. The net resultant force is exactly zero. Because there is no net unbalanced force, the object experiences no acceleration, meaning it either stays stationary or maintains its uniform velocity.
The resistive force of friction between two contacting surfaces always acts:
✅ Correct Answer
Concept Explanation
Friction is an opposing contact force that arises due to surface microscopic roughness. It opposes the relative sliding motion or tendency of motion between two surfaces, acting parallel to the contact interface and opposite to the direction of motion.
Assertion (A): A professional cricket player pulls their hands backward while catching a fast-moving cricket ball.
Reason (R): Increasing the total duration of the catch reduces the rate of change of momentum, thereby decreasing the impact force applied to the hands.
✅ Correct Answer
Concept Explanation
According to Newton's second law, force is proportional to the rate of change of momentum (Force = Change in Momentum / Time). By drawing the hands back with the ball, the player increases the time interval required to bring the ball's momentum to zero. A larger time interval drastically reduces the impact force, preventing injury.
An object maintaining a state of rest will stay at rest unless it is acted upon by an:
✅ Correct Answer
Concept Explanation
Balanced forces sum up to zero and cannot disrupt an object's current state of rest or motion. Only an unbalanced external force provides a non-zero net force, breaking the equilibrium and causing the object to accelerate or change its velocity profile.
The natural, inherent tendency of an object to resist any modification to its current state of motion is termed:
✅ Correct Answer
Concept Explanation
Inertia is a fundamental property of matter. It represents a body's resistance to changing its velocity. Because of inertia, stationary objects require an unbalanced force to start moving, and moving objects require a force to stop or turn.
Assertion (A): The calculated recoil velocity of a fired rifle is exceptionally small compared to the muzzle velocity of the escaping bullet.
Reason (R): The total physical mass of the rifle is significantly larger than the mass of the lightweight bullet.
✅ Correct Answer
Concept Explanation
By the Law of Conservation of Momentum, the initial momentum of the system is zero, so the backward momentum of the gun must equal the forward momentum of the bullet (Mass of gun × Recoil velocity = Mass of bullet × Velocity of bullet). Since the mass of the gun is massive compared to the bullet, its recoil velocity must be tiny to keep momentum balanced.
Expressed in fundamental base components, the standard derived SI unit of force is:
✅ Correct Answer
Concept Explanation
The Newton (N) is the derived SI unit of force. From Newton's second law (Force = mass × acceleration), force equals mass (measured in kilograms, kg) multiplied by acceleration (measured in metres per second squared, m s⁻²). Combining these yields the base unit expression: kg m s⁻².
The standard International System (SI) unit used to measure linear momentum is:
✅ Correct Answer
Concept Explanation
Linear momentum (p) is defined as the product of an object's mass (m) and its velocity (v). Since mass is measured in kilograms (kg) and velocity in metres per second (m s⁻¹), multiplying them gives the standard unit: kg m s⁻¹.
Assertion (A): The physical inertia of an object is uniquely and directly dependent upon its structural mass properties.
Reason (R): Mass is the fundamental quantitative measurement of a body's inertia.
✅ Correct Answer
Concept Explanation
Inertia is not an independent type of force; it is a baseline characteristic of matter quantified by mass. A heavier object resists modifications to its speed or path much more strongly than a lighter object does, because its larger mass serves as the direct measure of its inertia.
In classical mechanics, linear momentum is defined mathematically as the product of:
✅ Correct Answer
Concept Explanation
Linear momentum represents the quantity of motion embedded within a moving body. It is a vector quantity combining how massive the object is (m) with how fast and in what direction it moves (v).
If zero net external unbalanced force acts upon a system, the total linear momentum of that closed system:
✅ Correct Answer
Concept Explanation
The Law of Conservation of Momentum states that if an isolated system experiences no external unbalanced forces, internal interactions (like collisions) can only transfer momentum between parts, leaving the total system momentum completely unchanged.
Assertion (A): When two colliding bodies interact inside an isolated system, their combined total linear momentum remains perfectly constant throughout the impact.
Reason (R): The total linear momentum of any closed, isolated system is conserved if no external unbalanced force acts on it.
✅ Correct Answer
Concept Explanation
During a collision between two objects, the action-reaction forces are internal to the two-body system. Because these internal forces cancel out and no outside unbalanced forces are acting, the total momentum before the impact equals the total momentum afterward.
Newton's second law of motion provides an explicit mathematical relationship that maps net force to:
✅ Correct Answer
Concept Explanation
Newton's second law states that the acceleration of an object is directly proportional to the net force and inversely proportional to its mass, leading to the historical equation Force = mass × acceleration (F = ma).
By algebraic definition, a net force of exactly 1 newton will produce an acceleration of 1 m/s² when applied to a body of mass:
✅ Correct Answer
Concept Explanation
One Newton is defined as the amount of force required to accelerate a 1 kilogram mass at a rate of 1 m/s². This baseline comes directly from substituting values into the second law formula (1 N = 1 kg × 1 m/s²).
When a speeding transit bus brakes suddenly to a stop, passengers find themselves thrown forward due to:
✅ Correct Answer
Concept Explanation
When the bus brakes, an external force stops the vehicle. However, the passenger's upper body is not directly tied to the brakes and tends to maintain its forward speed due to the inertia of motion, causing them to fall forward relative to the decelerating bus.
If the mass of an object is doubled while its acceleration is kept constant, the required net force will:
✅ Correct Answer
Concept Explanation
By Newton's second law (F = ma), force maintains a direct linear relationship with mass. Doubling the mass (2m) while keeping acceleration constant (a) results in a new force value of exactly double the original force.
A fast-moving truck represents a much greater danger during an impact than a heavy parked truck because the moving vehicle holds a larger:
✅ Correct Answer
Concept Explanation
While both trucks share an identical mass (and thus identical inertia), the stationary truck holds zero velocity, rendering its momentum zero (p = 0). The moving truck combines its large mass with high velocity, creating a massive momentum value that exerts a high impact force when stopped abruptly.
According to Newton's third law of motion, action and reaction force pairs always act upon:
✅ Correct Answer
Concept Explanation
Action and reaction forces cannot cancel each other out because they act on two entirely different bodies. For instance, when you walk, your foot exerts a backward force on the ground (action), and the ground exerts an equal forward force on your foot (reaction).
When a projectile firearm is discharged, the gun recoils backward dynamically as a direct demonstration of:
✅ Correct Answer
Concept Explanation
When a bullet is fired, the gunpowder explosion exerts a powerful forward force on the bullet (action). According to Newton's third law, the bullet exerts an equal and opposite force backward on the gun (reaction), causing the weapon to kick back or recoil.
The calculated rate of change of linear momentum of an object is equal to the:
✅ Correct Answer
Concept Explanation
Newton's second law is fundamentally defined in terms of momentum: the applied net force is directly equal to the rate of change of momentum (Force = Change in Momentum / Time). This simplifies into F = ma when the mass remains constant.
Compared to lighter items, objects possessing a larger mass automatically hold:
✅ Correct Answer
Concept Explanation
Because mass serves as the direct quantitative index of inertia, a heavier object requires a much larger unbalanced force to change its state of rest or speed than a lighter object does.
When an inflated toy balloon is released, it jets forward rapidly as air escapes backward, demonstrating:
✅ Correct Answer
Concept Explanation
As the elastic balloon skin contracts, it forces the trapped air out of the nozzle backward (action). According to Newton's third law, the rushing air mass pushes the balloon structure forward with an equal and opposite force (reaction).
The vector equation F = ma serves as the definitive mathematical derivation of:
✅ Correct Answer
Concept Explanation
The equation F = ma mathematically defines Newton's second law of motion, demonstrating that the net force applied to a body produces an acceleration directly proportional to the force and inversely proportional to the body's mass.
Which of the following physical quantities is capable of changing the state of rest or uniform motion of an object?
✅ Correct Answer
Concept Explanation
A force is a push or a pull acting upon an object resulting from its interaction with another object. While an object's mass resists changes to its motion, only an external unbalanced force can alter its speed, bring it to rest, or change its direction of travel.
Assertion (A): A moving object will continue to drift with a completely uniform velocity if the net unbalanced external force acting on it is zero.
Reason (R): According to Newton's first law of motion, an object inherently resists any change to its current state of rest or uniform motion.
✅ Correct Answer
Concept Explanation
Newton's first law of motion (the Law of Inertia) establishes that a body cannot spontaneously modify its state of motion. If all forces acting on a moving object are perfectly balanced, there is no net external cause to slow it down or speed it up, so it continues moving with a constant velocity. The reason directly explains the assertion.
When two forces of perfectly equal magnitude act on an object in exactly opposite directions, the object will:
✅ Correct Answer
Concept Explanation
When equal and opposite forces act on a body, they constitute balanced forces. The net resultant force is exactly zero. Because there is no net unbalanced force, the object experiences no acceleration, meaning it either stays stationary or maintains its uniform velocity.
The resistive force of friction between two contacting surfaces always acts:
✅ Correct Answer
Concept Explanation
Friction is an opposing contact force that arises due to surface microscopic roughness. It opposes the relative sliding motion or tendency of motion between two surfaces, acting parallel to the contact interface and opposite to the direction of motion.
Assertion (A): A professional cricket player pulls their hands backward while catching a fast-moving cricket ball.
Reason (R): Increasing the total duration of the catch reduces the rate of change of momentum, thereby decreasing the impact force applied to the hands.
✅ Correct Answer
Concept Explanation
According to Newton's second law, force is proportional to the rate of change of momentum (Force = Change in Momentum / Time). By drawing the hands back with the ball, the player increases the time interval required to bring the ball's momentum to zero. A larger time interval drastically reduces the impact force, preventing injury.
An object maintaining a state of rest will stay at rest unless it is acted upon by an:
✅ Correct Answer
Concept Explanation
Balanced forces sum up to zero and cannot disrupt an object's current state of rest or motion. Only an unbalanced external force provides a non-zero net force, breaking the equilibrium and causing the object to accelerate or change its velocity profile.
The natural, inherent tendency of an object to resist any modification to its current state of motion is termed:
✅ Correct Answer
Concept Explanation
Inertia is a fundamental property of matter. It represents a body's resistance to changing its velocity. Because of inertia, stationary objects require an unbalanced force to start moving, and moving objects require a force to stop or turn.
Assertion (A): The calculated recoil velocity of a fired rifle is exceptionally small compared to the muzzle velocity of the escaping bullet.
Reason (R): The total physical mass of the rifle is significantly larger than the mass of the lightweight bullet.
✅ Correct Answer
Concept Explanation
By the Law of Conservation of Momentum, the initial momentum of the system is zero, so the backward momentum of the gun must equal the forward momentum of the bullet (Mass of gun × Recoil velocity = Mass of bullet × Velocity of bullet). Since the mass of the gun is massive compared to the bullet, its recoil velocity must be tiny to keep momentum balanced.
Expressed in fundamental base components, the standard derived SI unit of force is:
✅ Correct Answer
Concept Explanation
The Newton (N) is the derived SI unit of force. From Newton's second law (Force = mass × acceleration), force equals mass (measured in kilograms, kg) multiplied by acceleration (measured in metres per second squared, m s⁻²). Combining these yields the base unit expression: kg m s⁻².
The standard International System (SI) unit used to measure linear momentum is:
✅ Correct Answer
Concept Explanation
Linear momentum (p) is defined as the product of an object's mass (m) and its velocity (v). Since mass is measured in kilograms (kg) and velocity in metres per second (m s⁻¹), multiplying them gives the standard unit: kg m s⁻¹.
Assertion (A): The physical inertia of an object is uniquely and directly dependent upon its structural mass properties.
Reason (R): Mass is the fundamental quantitative measurement of a body's inertia.
✅ Correct Answer
Concept Explanation
Inertia is not an independent type of force; it is a baseline characteristic of matter quantified by mass. A heavier object resists modifications to its speed or path much more strongly than a lighter object does, because its larger mass serves as the direct measure of its inertia.
In classical mechanics, linear momentum is defined mathematically as the product of:
✅ Correct Answer
Concept Explanation
Linear momentum represents the quantity of motion embedded within a moving body. It is a vector quantity combining how massive the object is (m) with how fast and in what direction it moves (v).
If zero net external unbalanced force acts upon a system, the total linear momentum of that closed system:
✅ Correct Answer
Concept Explanation
The Law of Conservation of Momentum states that if an isolated system experiences no external unbalanced forces, internal interactions (like collisions) can only transfer momentum between parts, leaving the total system momentum completely unchanged.
Assertion (A): When two colliding bodies interact inside an isolated system, their combined total linear momentum remains perfectly constant throughout the impact.
Reason (R): The total linear momentum of any closed, isolated system is conserved if no external unbalanced force acts on it.
✅ Correct Answer
Concept Explanation
During a collision between two objects, the action-reaction forces are internal to the two-body system. Because these internal forces cancel out and no outside unbalanced forces are acting, the total momentum before the impact equals the total momentum afterward.
Newton's second law of motion provides an explicit mathematical relationship that maps net force to:
✅ Correct Answer
Concept Explanation
Newton's second law states that the acceleration of an object is directly proportional to the net force and inversely proportional to its mass, leading to the historical equation Force = mass × acceleration (F = ma).
By algebraic definition, a net force of exactly 1 newton will produce an acceleration of 1 m/s² when applied to a body of mass:
✅ Correct Answer
Concept Explanation
One Newton is defined as the amount of force required to accelerate a 1 kilogram mass at a rate of 1 m/s². This baseline comes directly from substituting values into the second law formula (1 N = 1 kg × 1 m/s²).
When a speeding transit bus brakes suddenly to a stop, passengers find themselves thrown forward due to:
✅ Correct Answer
Concept Explanation
When the bus brakes, an external force stops the vehicle. However, the passenger's upper body is not directly tied to the brakes and tends to maintain its forward speed due to the inertia of motion, causing them to fall forward relative to the decelerating bus.
If the mass of an object is doubled while its acceleration is kept constant, the required net force will:
✅ Correct Answer
Concept Explanation
By Newton's second law (F = ma), force maintains a direct linear relationship with mass. Doubling the mass (2m) while keeping acceleration constant (a) results in a new force value of exactly double the original force.
A fast-moving truck represents a much greater danger during an impact than a heavy parked truck because the moving vehicle holds a larger:
✅ Correct Answer
Concept Explanation
While both trucks share an identical mass (and thus identical inertia), the stationary truck holds zero velocity, rendering its momentum zero (p = 0). The moving truck combines its large mass with high velocity, creating a massive momentum value that exerts a high impact force when stopped abruptly.
According to Newton's third law of motion, action and reaction force pairs always act upon:
✅ Correct Answer
Concept Explanation
Action and reaction forces cannot cancel each other out because they act on two entirely different bodies. For instance, when you walk, your foot exerts a backward force on the ground (action), and the ground exerts an equal forward force on your foot (reaction).
When a projectile firearm is discharged, the gun recoils backward dynamically as a direct demonstration of:
✅ Correct Answer
Concept Explanation
When a bullet is fired, the gunpowder explosion exerts a powerful forward force on the bullet (action). According to Newton's third law, the bullet exerts an equal and opposite force backward on the gun (reaction), causing the weapon to kick back or recoil.
The calculated rate of change of linear momentum of an object is equal to the:
✅ Correct Answer
Concept Explanation
Newton's second law is fundamentally defined in terms of momentum: the applied net force is directly equal to the rate of change of momentum (Force = Change in Momentum / Time). This simplifies into F = ma when the mass remains constant.
Compared to lighter items, objects possessing a larger mass automatically hold:
✅ Correct Answer
Concept Explanation
Because mass serves as the direct quantitative index of inertia, a heavier object requires a much larger unbalanced force to change its state of rest or speed than a lighter object does.
When an inflated toy balloon is released, it jets forward rapidly as air escapes backward, demonstrating:
✅ Correct Answer
Concept Explanation
As the elastic balloon skin contracts, it forces the trapped air out of the nozzle backward (action). According to Newton's third law, the rushing air mass pushes the balloon structure forward with an equal and opposite force (reaction).
The vector equation F = ma serves as the definitive mathematical derivation of:
✅ Correct Answer
Concept Explanation
The equation F = ma mathematically defines Newton's second law of motion, demonstrating that the net force applied to a body produces an acceleration directly proportional to the force and inversely proportional to the body's mass.
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SEBA Class 9 Science Chapter 9 Force and Laws of Motion MCQs – Important Objective Questions
A strong understanding of Force and Laws of Motion is essential for mastering the fundamentals of Physics. Regular practice of well-structured MCQs based on the latest SEBA (ASSEB) syllabus helps students build conceptual clarity and become familiar with the types of objective and numerical questions asked in examinations.
These SEBA Class 9 Science Chapter 9 MCQs cover important topics such as inertia, momentum, Newton’s laws of motion, the relation F = ma, action and reaction forces, and the principle of conservation of momentum. Since this chapter involves both theoretical understanding and numerical application, consistent practice is key to improving accuracy and confidence.
By solving these important objective questions for Class 9 Science, students can enhance their ability to apply formulas correctly, interpret physical situations, and solve numerical problems efficiently. It also helps in avoiding common mistakes related to sign conventions, units, and conceptual differences between force-related quantities.
Consistent MCQ practice improves speed, precision, and confidence. Students become more comfortable with exam patterns, manage time effectively, and can revise the chapter quickly before tests or final examinations.
To perform well in school assessments and board-level exams, students should make these MCQs a regular part of their study routine. With continuous practice and a clear understanding of concepts, scoring high in this chapter becomes much more achievable and less stressful.
FAQs – SEBA Class 9 Science Chapter 9 Force and Laws of Motion MCQs
1. How many MCQs come from Force and Laws of Motion in SEBA Class 9 exam?
About 4–5 MCQs usually come from this chapter. Focus on laws, numericals, and formulas to score easy marks quickly.
2. What are the most important MCQs from Chapter 9 Force and Laws of Motion?
Important MCQs focus on Newton’s laws, inertia, momentum, and numericals. Practice chapter-wise questions from Assam Eduverse for better exam confidence.
3. Is Force and Laws of Motion a difficult chapter for SEBA Class 9 students?
No, it’s easy if you understand concepts and practice numericals. Start with formulas, then solve MCQs regularly to build confidence.
4. Where can I download SEBA Class 9 Force and Laws of Motion MCQs with answers?
You can download chapter-wise MCQs PDFs from trusted sites like Assam Eduverse. Always revise solved examples before attempting MCQs.
5. Do numericals come in MCQs from Force and Laws of Motion?
Yes, simple numericals based on F=ma and momentum appear in MCQs. Practice basic calculations to avoid mistakes in the exam.
6. How to prepare quickly for Force and Laws of Motion MCQs before exam?
Revise formulas, practice previous MCQs, and focus on concepts like inertia and action-reaction. Solve at least 40–50 MCQs before exams.
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