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NEET Physics: kinetic and potential energies Practice Questions

11 free multiple-choice questions on kinetic and potential energies (Work, Energy, and Power) 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. The kinetic energy of a body is directly proportional to the square of its speed. If the speed of a moving object is doubled, how does its kinetic energy change?

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

    Correct answer: D — It is quadrupled

    Kinetic energy (KE) is given by KE = 1/2 mv². If the speed (v) is doubled to 2v, the new KE is 1/2 m (2v)² = 1/2 m (4v²) = 4 (1/2 mv²), meaning the kinetic energy is quadrupled.

  2. Q2. When an object is at rest, what is its kinetic energy?

    • AUndefined
    • BZero
    • CMaximum
    • DEqual to potential energy
    Show answer & explanation

    Correct answer: B — Zero

    Kinetic energy depends on motion. If an object is at rest (velocity is zero), its kinetic energy is zero.

  3. Q3. If the total mechanical energy of a system is conserved, what relationship must exist between the change in kinetic energy and the change in potential energy?

    • AKE must remain constant regardless of PE changes
    • BThe change in KE is equal to the negative change in PE
    • CKE increases while PE decreases
    • DKE increases while PE increases
    Show answer & explanation

    Correct answer: B — The change in KE is equal to the negative change in PE

    According to the law of conservation of energy, the change in kinetic energy (ΔKE) must be equal to the negative change in potential energy (ΔPE). Thus, ΔKE = -ΔPE, meaning KE + PE = constant.

  4. Q4. Which type of energy is associated with the motion of an object?

    • APotential Energy
    • BThermal Energy
    • CKinetic Energy
    • DChemical Energy
    Show answer & explanation

    Correct answer: C — Kinetic Energy

    Kinetic energy (KE) is the energy possessed by an object due to its motion. Potential energy (PE) is stored energy due to position or configuration.

  5. Q5. The energy stored in an object due to its position relative to the Earth (due to gravity) is known as:

    • AMechanical Energy
    • BKinetic Energy
    • CPotential Energy
    • DThermal Energy
    Show answer & explanation

    Correct answer: C — Potential Energy

    Energy stored due to position or configuration is called Potential Energy.

  6. Q6. Two objects of the same mass are at the same height. Which statement is true regarding their gravitational potential energy?

    • ATheir potential energies are different.
    • BTheir kinetic energies are equal.
    • CTheir potential energies are equal.
    • DTheir potential energies are zero.
    Show answer & explanation

    Correct answer: C — Their potential energies are equal.

    Since PE = mgh, if the mass (m) and height (h) are the same for both objects, their gravitational potential energies must be equal.

  7. Q7. The kinetic energy of a particle is directly proportional to the square of its speed. If the speed of the particle is tripled, how does its kinetic energy change?

    • ANine times
    • BHalves
    • CTriples
    • DDoubles
    Show answer & explanation

    Correct answer: A — Nine times

    Kinetic Energy (KE) is given by KE = 1/2mv². If the speed (v) is tripled (3v), the new KE will be 1/2m(3v)² = 9/2mv², which is nine times the original KE.

  8. Q8. A ball is thrown vertically upwards. At the maximum height reached, what is the value of its kinetic energy?

    • AMaximum
    • BHalf of the total potential energy
    • CEqual to its potential energy at the starting point
    • DZero
    Show answer & explanation

    Correct answer: D — Zero

    At the maximum height, the vertical velocity of the ball is momentarily zero. Since KE = 1/2 mv², if v=0, the kinetic energy of the ball at the peak height is zero.

  9. Q9. Gravitational potential energy depends on which two physical quantities?

    • AMass and Height
    • BSpeed and Force
    • CMass and Acceleration
    • DMass and Velocity
    Show answer & explanation

    Correct answer: A — Mass and Height

    Gravitational Potential Energy (PE) is defined by PE = mgh, where m is the mass, g is the acceleration due to gravity, and h is the height relative to a reference point.

  10. Q10. The potential energy of an object due to gravity depends primarily on which two physical quantities?

    • AMass and velocity
    • BMass and acceleration
    • CForce and distance
    • DMass and height
    Show answer & explanation

    Correct answer: D — Mass and height

    Gravitational potential energy (PE = mgh) depends directly on the mass (m) of the object and the height (h) at which it is located.

  11. Q11. Which of the following quantities is a measure of the energy possessed by an object due to its motion?

    • AKinetic Energy
    • BWork Done
    • CPotential Energy
    • DPower
    Show answer & explanation

    Correct answer: A — Kinetic Energy

    Kinetic energy (KE) is the energy an object possesses due to its motion.

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