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NEET Physics: Uniform Circular Motion Practice Questions

14 free multiple-choice questions on Uniform Circular Motion (Kinematics) 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. If the angular velocity of a rotating object is doubled, while the radius of the circular path remains constant, what happens to the tangential velocity of the object?

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

    Correct answer: A — It is doubled

    Tangential velocity (v) is related to angular velocity (ω) and radius (r) by the formula v = rω. If ω is doubled and r is constant, the tangential velocity v must also be doubled.

  2. Q2. The magnitude of the force required to maintain a particle in uniform circular motion is defined as:

    • ATangential force
    • BCentrifugal force
    • CGravitational force
    • DCentripetal force
    Show answer & explanation

    Correct answer: D — Centripetal force

    The net force required to cause the centripetal acceleration is called the centripetal force, which is directed towards the center of the circle.

  3. Q3. For an object moving in a circle at a constant speed, the net force acting on the object is directed:

    • APerpendicular to the path and away from the center
    • BTangentially along the path
    • CRadially inward towards the center
    • DAlong the direction of velocity
    Show answer & explanation

    Correct answer: C — Radially inward towards the center

    In uniform circular motion, the velocity is constantly changing direction, meaning there must be an acceleration directed towards the center. The net force responsible for this acceleration is the centripetal force, which is directed radially inward.

  4. Q4. In Uniform Circular Motion, if the speed of the particle is doubled while the radius of the circle remains constant, the new centripetal acceleration will be:

    • AHalf of the original acceleration
    • BDouble the original acceleration
    • CFour times the original acceleration
    • DOne-fourth of the original acceleration
    Show answer & explanation

    Correct answer: B — Double the original acceleration

    Centripetal acceleration (a_c) is proportional to the square of the velocity (v²/r). If speed doubles (v → 2v), the acceleration becomes (2v)²/r = 4v²/r, which is four times the original acceleration.

  5. Q5. In Uniform Circular Motion, the tangential acceleration is always zero. What is the nature of the tangential velocity?

    • AIt is constantly decreasing
    • BIt remains constant
    • CIt is constantly increasing
    • DIt alternates direction
    Show answer & explanation

    Correct answer: B — It remains constant

    Uniform motion implies constant speed, meaning the tangential component of velocity is constant. Tangential acceleration is zero in UCM.

  6. Q6. A particle moves in a circle with a constant speed. What is the direction of the centripetal acceleration experienced by the particle?

    • AAway from the center of the circle
    • BTowards the center of the circle
    • CUpwards
    • DDownwards
    Show answer & explanation

    Correct answer: B — Towards the center of the circle

    Centripetal acceleration is the acceleration directed towards the center of the circular path.

  7. Q7. Which physical quantity describes the rate at which the angular position of a rotating body changes?

    • AAngular velocity
    • BLinear momentum
    • CTangential velocity
    • DCentripetal acceleration
    Show answer & explanation

    Correct answer: A — Angular velocity

    Angular velocity (ω) is the measure of how fast the angular displacement is changing.

  8. Q8. Which quantity is always directed towards the center of the circle during Uniform Circular Motion?

    • ACentrifugal Force
    • BVelocity
    • CTangential Acceleration
    • DCentripetal Acceleration
    Show answer & explanation

    Correct answer: D — Centripetal Acceleration

    Centripetal acceleration is the net acceleration pointing towards the center of the circular path.

  9. Q9. In Uniform Circular Motion (UCM), the tangential component of velocity of a particle is:

    • AThe centripetal acceleration
    • BThe component responsible for the change in direction
    • CThe acceleration of the particle
    • DThe net change in velocity
    Show answer & explanation

    Correct answer: A — The centripetal acceleration

    In UCM, the tangential velocity is the component of velocity directed along the tangent to the circular path. Since the motion is uniform, the magnitude of the tangential velocity remains constant.

  10. Q10. If an object moves in a circle at a constant speed, the direction of the acceleration is always:

    • APerpendicular to the path
    • BOpposite to the velocity
    • CDirected towards the center of the circle
    • DTangential to the path
    Show answer & explanation

    Correct answer: C — Directed towards the center of the circle

    Since the speed is constant, the acceleration is purely centripetal, which is directed towards the center of the circle.

  11. Q11. The tangential acceleration of an object undergoing uniform circular motion is:

    • AConstant and non-zero
    • BMaximum possible value
    • CEqual to the centripetal acceleration
    • DZero
    Show answer & explanation

    Correct answer: D — Zero

    In uniform circular motion, the speed is constant, meaning the tangential acceleration (the rate of change of speed) is zero.

  12. Q12. Which physical quantity is the vector sum of the tangential acceleration and the centripetal acceleration in UCM?

    • ACentripetal force
    • BTangential velocity
    • CLinear momentum
    • DAcceleration vector
    Show answer & explanation

    Correct answer: D — Acceleration vector

    The total acceleration vector is the vector sum of the tangential acceleration (change in speed) and the centripetal acceleration (change in direction).

  13. Q13. For a body executing uniform circular motion, if the radius of the circular path is halved, how does the required centripetal acceleration change?

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

    Correct answer: D — It is doubled

    Centripetal acceleration a_c = v²/r. If r is halved, a_c becomes (v² / (r/2)) = 2(v²/r), so it is doubled.

  14. Q14. The direction of centripetal acceleration in uniform circular motion is always:

    • ADirected towards the center of the circle
    • BPerpendicular to the radius vector
    • COpposite to the velocity vector
    • DTangential to the path
    Show answer & explanation

    Correct answer: A — Directed towards the center of the circle

    Centripetal acceleration is the acceleration directed towards the center of the circle, which is perpendicular to the tangential velocity.

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