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NEET Physics: Momentum Practice Questions

13 free multiple-choice questions on Momentum (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. Impulse is defined as the product of the force applied and the time interval over which the force acts. What is the unit of impulse?

    • AJoule
    • BNewton
    • CNewton-second
    • Dkg⋅m/s
    Show answer & explanation

    Correct answer: C — Newton-second

    Impulse (J) is Force (N) multiplied by Time (s), so the unit is Newton-second (N·s), which is equivalent to kg·m/s.

  2. Q2. A collision occurs where no external forces act on the system. According to the law of conservation of momentum, what remains constant in such a collision?

    • AThe total kinetic energy
    • BThe final velocity of the objects
    • CThe total linear momentum and kinetic energy
    • DThe total momentum
    Show answer & explanation

    Correct answer: D — The total momentum

    In the absence of external forces, the total linear momentum of the system remains constant (Law of Conservation of Momentum).

  3. Q3. A moving object has momentum p. If its mass is doubled while its velocity remains the same, how does its momentum change?

    • AIt is doubled
    • BIt is quadrupled
    • CIt is halved
    • DIt remains the same
    Show answer & explanation

    Correct answer: A — It is doubled

    Momentum (p) is defined as p=mv. If mass (m) is doubled and velocity (v) is constant, the new momentum becomes p' = (2m)v = 2(mv) = 2p. Thus, the momentum is doubled.

  4. Q4. In a collision between two objects where no external forces act on the system, which of the following quantities is strictly conserved?

    • AThe change in momentum of the objects
    • BThe total momentum and kinetic energy
    • CThe total momentum of the system
    • DThe kinetic energy of the system
    Show answer & explanation

    Correct answer: C — The total momentum of the system

    According to the Law of Conservation of Momentum, if no net external force acts on a system, the total momentum of the system remains constant, regardless of the internal forces (like the force of collision).

  5. Q5. Which of the following physical quantities is a vector quantity?

    • AMass
    • BSpeed
    • CDistance
    • DVelocity
    Show answer & explanation

    Correct answer: D — Velocity

    Velocity is the rate of change of displacement and has both magnitude and direction, making it a vector. Distance and speed are scalars, and mass is a scalar.

  6. Q6. Impulse is equal to the change in which of the following quantities?

    • AChange in force
    • BChange in kinetic energy
    • CChange in momentum
    • DChange in velocity
    Show answer & explanation

    Correct answer: C — Change in momentum

    The Impulse-Momentum Theorem states that impulse is equal to the change in momentum (Impulse = Δp).

  7. Q7. If the mass of an object remains constant, its momentum is directly proportional to its:

    • AVelocity
    • BTime
    • CForce
    • DAcceleration
    Show answer & explanation

    Correct answer: A — Velocity

    Momentum p=mv. If mass (m) is constant, momentum (p) is directly proportional to velocity (v).

  8. Q8. In a collision where no external forces act, the total momentum of the system is always:

    • ARemains constant
    • BChanges
    • CDecreases
    • DIncreases
    Show answer & explanation

    Correct answer: A — Remains constant

    The Law of Conservation of Momentum states that if no external net force acts on a system, its total momentum remains constant.

  9. Q9. The quantity of motion of a body is directly proportional to its momentum. If the mass of a body is doubled while its velocity remains constant, what happens to its momentum?

    • AIt is halved
    • BIt is doubled
    • CIt remains the same
    • DIt is quadrupled
    Show answer & explanation

    Correct answer: B — It is doubled

    Momentum (p = mv). If mass (m) is doubled and velocity (v) is constant, momentum will also be doubled.

  10. Q10. A force applied over a short time interval results in a large change in:

    • AMomentum
    • BPotential Energy
    • CRest mass
    • DMass
    Show answer & explanation

    Correct answer: A — Momentum

    Impulse (J = FΔt) is the change in momentum. A large force applied over a small time interval results in a large change in momentum.

  11. Q11. The SI unit of momentum is equivalent to which combination of base SI units?

    • AJ/s
    • Bkg⋅m/s²
    • Ckg/s
    • DN⋅s
    Show answer & explanation

    Correct answer: C — kg/s

    Momentum (p = mv) is mass times velocity. The unit is kg⋅m/s, which is equivalent to kg⋅m/s. (Note: While kg⋅m/s is often used, the fundamental relationship based on base units is kg⋅m/s.)

  12. Q12. Momentum is a vector quantity. What does the direction of momentum always depend on?

    • AThe direction of the displacement
    • BThe direction of the mass
    • CThe direction of the velocity
    • DThe direction of the applied force
    Show answer & explanation

    Correct answer: C — The direction of the velocity

    Since momentum is defined as mass times velocity (p = mv), its direction is the same as the direction of the velocity.

  13. Q13. If the momentum of an object is doubled, and its mass remains the same, how does its velocity change?

    • AIt remains the same
    • BIt is halved
    • CIt is quadrupled
    • DIt is doubled
    Show answer & explanation

    Correct answer: D — It is doubled

    Since momentum p=mv, if p is doubled and m is constant, then v must also be doubled (2p = m v' ⇒ v' = 2v).

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