Free daily NEET & JEE PYQs, quizzes & mock tests on TelegramJoin free →

NEET Physics: Force and inertia Practice Questions

13 free multiple-choice questions on Force and inertia (Laws of Motion) for NEET Physics, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.

Practice thousands more NEET questions in the app →

  1. Q1. A body is placed in a container and remains at rest. If the external force applied to it is zero, what is the state of motion of the body?

    • AIt is moving at constant velocity.
    • BIt is at rest.
    • CIt is accelerating.
    • DIt is moving with zero momentum.
    Show answer & explanation

    Correct answer: B — It is at rest.

    If the net external force is zero, the object remains in its state of rest (or uniform motion). This is a direct consequence of the First Law of Motion.

  2. Q2. A truck moving at a constant velocity travels 100 km in 2 hours. If the truck suddenly stops, which property of the truck resists the change in motion?

    • AForce
    • BAcceleration
    • CVelocity
    • DMomentum
    Show answer & explanation

    Correct answer: D — Momentum

    The property that resists the change in motion (rest or motion) is inertia. Since the truck is moving, it possesses inertia of motion, which resists the change when the external force changes (i.e., when it stops).

  3. Q3. Inertia of an object is a measure of its resistance to change in which property of motion?

    • AForce
    • BAcceleration
    • CMomentum
    • DVelocity
    Show answer & explanation

    Correct answer: B — Acceleration

    Inertia is the measure of an object's resistance to any change in its state of rest or uniform motion. It is fundamentally related to mass.

  4. Q4. An object is said to possess inertia. Inertia is fundamentally a measure of which property of a body?

    • AThe velocity of the body
    • BThe force acting on the body
    • CThe mass of the body
    • DThe acceleration produced by the force
    Show answer & explanation

    Correct answer: C — The mass of the body

    Inertia is the intrinsic property of a body that resists any change in its state of rest or state of motion. This resistance is directly proportional to the mass of the object, making mass the fundamental property measured by inertia.

  5. Q5. Which of the following statements is a correct application of Newton's Third Law of Motion?

    • AAction and reaction forces act on the same body.
    • BAction and reaction forces are always equal in magnitude but opposite in direction (and act on different bodies).
    • CForce is always repulsive.
    • DAction and reaction forces act on different bodies.
    Show answer & explanation

    Correct answer: B — Action and reaction forces are always equal in magnitude but opposite in direction (and act on different bodies).

    Newton's Third Law states that for every action, there is an equal and opposite reaction, and these forces act on two different interacting bodies.

  6. Q6. A change in the state of motion of an object is directly proportional to the net force applied to it, provided the mass is constant. This is represented by which law?

    • AFirst Law of Motion
    • BLaw of Conservation of Momentum
    • CSecond Law of Motion
    • DThird Law of Motion
    Show answer & explanation

    Correct answer: C — Second Law of Motion

    This relationship is defined by Newton's Second Law of Motion, F=ma, where force is proportional to the rate of change of momentum (F = Δp / Δt).

  7. Q7. Which physical quantity is mathematically defined as the rate of change of momentum with respect to time?

    • AMomentum
    • BAcceleration
    • CImpulse
    • DForce
    Show answer & explanation

    Correct answer: A — Momentum

    Momentum (p) is defined as the product of mass and velocity (p=mv). The rate of change of momentum is equal to the net external force acting on the body, which relates to acceleration.

  8. Q8. If the mass of an object is doubled while its velocity remains constant, its inertia will:

    • ABe halved
    • BRemain the same
    • CBe doubled
    • DBe quadrupled
    Show answer & explanation

    Correct answer: C — Be doubled

    Inertia is directly proportional to mass. If the mass is doubled, the inertia of the object is also doubled.

  9. Q9. If the net external force acting on a system of objects is zero, what must be true about the momentum of the system?

    • AThe total momentum of the system must be constant.
    • BThe total momentum of the system must be zero.
    • CThe total momentum of the system must be increasing.
    • DThe total momentum of the system must be zero only if the system is at rest.
    Show answer & explanation

    Correct answer: A — The total momentum of the system must be constant.

    According to the law of conservation of momentum, if the net external force on a system is zero, the total momentum of the system remains constant. This is a direct consequence of Newton's First Law.

  10. Q10. A body moving with constant velocity is experiencing which type of force?

    • AA force causing acceleration
    • BZero net force
    • CNon-zero force
    • DA force causing change in direction only
    Show answer & explanation

    Correct answer: B — Zero net force

    Constant velocity implies zero acceleration. According to Newton's Second Law (F=ma), if acceleration (a) is zero, the net force (F) acting on the body must be zero.

  11. Q11. If an object is brought to rest by an external force, the change in its momentum is directly proportional to the applied force and the time interval:

    • ADirectly proportional to time
    • BRelated to the mass only
    • CInversely proportional to time
    • DIndependent of time
    Show answer & explanation

    Correct answer: A — Directly proportional to time

    The impulse (change in momentum) is given by F Δt. Therefore, the change in momentum is directly proportional to the applied force and the time interval over which the force acts.

  12. Q12. An object is moving with a constant velocity. What is the net force acting on the object?

    • APositive
    • BZero
    • CDependent on mass
    • DNegative
    Show answer & explanation

    Correct answer: B — Zero

    According to Newton's First Law, if the velocity is constant (meaning acceleration is zero), the net external force acting on the object must be zero (F=ma; if a=0, then F=0).

  13. Q13. The tendency of an object to resist any change in its state of motion is defined as:

    • AMomentum
    • BInertia
    • CForce
    • DAcceleration
    Show answer & explanation

    Correct answer: B — Inertia

    Inertia is the intrinsic property of a body that resists any change in its state of rest or motion.

Keep going — practice on Padhai Karlo

Padhai Karlo gives you unlimited NEET practice: chapter-wise questions, timed quizzes, and full mock tests with an All-India Rank — free to start.

Get the free Android app →

More Laws of Motion topics

← All Laws of Motion practice