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NEET Physics: Newton’s First law of motion Practice Questions

15 free multiple-choice questions on Newton’s First law of motion (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.

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  1. Q1. Which of the following is the fundamental statement of Newton's First Law of Motion?

    • AAn object remains in a state of rest or uniform motion unless acted upon by an external force.
    • BForce is the rate of change of momentum.
    • CAction and reaction forces are always equal and opposite.
    • DForce is equal to mass times acceleration.
    Show answer & explanation

    Correct answer: A — An object remains in a state of rest or uniform motion unless acted upon by an external force.

    Newton's First Law states that an object maintains its state of rest or uniform motion unless acted upon by an external net force.

  2. Q2. An object is at rest on the floor. If no external force acts on the object, what is the state of motion of the object?

    • AIt is accelerating
    • BIt remains at rest
    • CIt is moving at a constant velocity
    • DIt moves in a circular path
    Show answer & explanation

    Correct answer: B — It remains at rest

    According to Newton's First Law of Motion, an object remains in a state of rest or uniform motion unless acted upon by a net external force. If no net force acts, the object remains at rest.

  3. Q3. A body at rest has zero momentum. What is the fundamental physical property that dictates its resistance to starting motion?

    • AEnergy
    • BMass
    • CMomentum
    • DForce
    Show answer & explanation

    Correct answer: B — Mass

    Momentum is the product of mass and velocity. An object at rest has zero momentum. Its resistance to change (inertia) is defined by its mass.

  4. Q4. Inertia is the property of a body that resists any change in its state of motion. This resistance is directly proportional to the body's:

    • Aacceleration
    • Bvelocity
    • Cmass
    • Dmomentum
    Show answer & explanation

    Correct answer: C — mass

    Inertia is the resistance to change in motion. According to Newton's First Law, inertia is directly proportional to the mass of the object.

  5. Q5. An object is moving with a constant velocity. According to Newton’s First Law of Motion, the net external force acting on the object must be:

    • Azero
    • Bnegative
    • Cpositive
    • Dnon-zero
    Show answer & explanation

    Correct answer: A — zero

    If an object moves at a constant velocity (constant speed in a straight line), its acceleration is zero. According to the First Law, if acceleration is zero, the net external force acting on it must be zero.

  6. Q6. A passenger in a moving train tends to lean backward when the train is suddenly stopped. This phenomenon is explained by:

    • AInertia of Direction
    • BInertia of Rest
    • CInertia of Motion
    • DMomentum Conservation
    Show answer & explanation

    Correct answer: B — Inertia of Rest

    When the train is stopped, the passenger's body tends to remain in its state of motion (forward motion). This resistance to change in motion is due to the inertia of rest.

  7. Q7. If the net force acting on a body is zero, which statement is true regarding its acceleration?

    • AThe body is accelerating
    • BThe body is at rest
    • CThe body is changing its direction of motion
    • DThe body is moving with uniform velocity
    Show answer & explanation

    Correct answer: B — The body is at rest

    According to Newton's Second Law (which builds upon the First Law), if the net force is zero, the acceleration is zero. Therefore, the body remains at rest or moves with constant velocity (which includes rest).

  8. Q8. An object continues to move in a straight line at a constant speed. What can be concluded about the net force acting on the object?

    • AThe net force is proportional to the mass.
    • BThe net force is directed opposite to the motion.
    • CThe net force is non-zero but parallel to the motion.
    • DThe net force is zero.
    Show answer & explanation

    Correct answer: D — The net force is zero.

    According to Newton's First Law, if an object moves at a constant velocity (constant speed in a straight line), its acceleration is zero. According to the second law (F=ma), if acceleration is zero, the net external force acting on the object must be zero.

  9. Q9. Inertia is the property of an object to resist any change in its state of motion. Which of the following physical quantities is directly proportional to the inertia of an object?

    • AForce
    • BMass
    • CVelocity
    • DAcceleration
    Show answer & explanation

    Correct answer: B — Mass

    Inertia is directly proportional to the mass of the object. Mass is the measure of the amount of matter in an object, and it dictates its resistance to changes in motion.

  10. Q10. If an object is moving with a constant velocity, which statement is true regarding its momentum?

    • AIts momentum is increasing exponentially.
    • BIts momentum remains constant.
    • CIts momentum is constantly decreasing.
    • DIts momentum is zero.
    Show answer & explanation

    Correct answer: B — Its momentum remains constant.

    Momentum is defined as mass times velocity (p=mv). Since both mass (m) and velocity (v) are constant, the momentum (p) of the object also remains constant.

  11. Q11. Inertia of an object is fundamentally related to which property of matter?

    • AMomentum
    • BVelocity
    • CAcceleration
    • DMass
    Show answer & explanation

    Correct answer: D — Mass

    Inertia is the inherent property of a body by virtue of which it resists any change in its state of rest or uniform motion. This resistance is directly proportional to the mass of the object.

  12. Q12. If no external force acts on a body, its state of motion will remain unchanged. This statement directly reflects which law of motion?

    • ANewton's Third Law
    • BLaw of Conservation of Momentum
    • CNewton's First Law
    • DNewton's Second Law
    Show answer & explanation

    Correct answer: C — Newton's First Law

    Newton's First Law of Motion defines that an object remains in a state of rest or uniform motion unless acted upon by an external force.

  13. Q13. Which of the following statements best describes the condition under which an object remains in a state of rest or uniform motion?

    • AThe object is moving with constant acceleration.
    • BThe net external force acting on the object is zero.
    • CThe object is accelerating in a circular path.
    • DThe object is experiencing a non-zero kinetic energy.
    Show answer & explanation

    Correct answer: B — The net external force acting on the object is zero.

    Newton's First Law states that an object remains in a state of rest or uniform motion unless acted upon by an external net force (i.e., the net force is zero).

  14. Q14. A book rests on a table. If a constant horizontal force is applied to the book, what must happen to the book if the net force acting on it is zero?

    • AThe book will move
    • BThe book will remain at rest
    • CThe book will move backward
    • DThe book will accelerate
    Show answer & explanation

    Correct answer: B — The book will remain at rest

    If the net force acting on the book is zero, its state of motion will not change. Since it was initially at rest, it will remain at rest.

  15. Q15. The tendency of an object to resist any change in its state of rest or uniform motion is known as:

    • AAcceleration
    • BMomentum
    • CForce
    • DInertia
    Show answer & explanation

    Correct answer: D — Inertia

    Inertia is the intrinsic property of an object that measures its resistance to changes in its state of motion.

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