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NEET Physics: Dynamics of uniform circular motion Practice Questions

14 free multiple-choice questions on Dynamics of uniform circular 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 component of acceleration is responsible for changing the direction of the velocity in circular motion?

    • ACentripetal acceleration
    • BGravitational acceleration
    • CTangential acceleration
    • DNormal acceleration
    Show answer & explanation

    Correct answer: A — Centripetal acceleration

    Centripetal acceleration is the component of acceleration directed towards the center, which causes the change in direction of the velocity.

  2. Q2. A particle is moving in a uniform circular motion. The force directed towards the center of the circle is known as:

    • AFriction force
    • BCentripetal force
    • CGravitational force
    • DCentrifugal force
    Show answer & explanation

    Correct answer: B — Centripetal force

    The net force required to keep an object moving in a circle is called the centripetal force. This force is always directed towards the center of the circle, causing the centripetal acceleration.

  3. Q3. A particle is moving in a circle at a constant speed. What is the direction of the centripetal acceleration?

    • ATowards the center
    • BAway from the center
    • CAlong the tangent
    • DTowards the tangent
    Show answer & explanation

    Correct answer: A — Towards the center

    Centripetal acceleration is the acceleration directed towards the center of the circular path, necessary to keep the particle moving in a circle.

  4. Q4. In uniform circular motion, the acceleration experienced by an object is directed towards the:

    • ATangent to the path
    • BCenter of the circle
    • CPerpendicular to the velocity
    • DOpposite direction of the force
    Show answer & explanation

    Correct answer: B — Center of the circle

    For uniform circular motion, the acceleration is centripetal, meaning it is directed towards the center of the circle.

  5. Q5. The force required to maintain uniform circular motion is known as the:

    • ATension force
    • BCentripetal force
    • CCentrifugal force
    • DFrictional force
    Show answer & explanation

    Correct answer: B — Centripetal force

    The net force directed towards the center of the circle, which is necessary to cause the circular motion, is called the centripetal force.

  6. Q6. What is the direction of the centripetal acceleration in uniform circular motion?

    • AOpposite to the velocity
    • BTowards the center of the circle
    • CRadial outwards
    • DTangential direction
    Show answer & explanation

    Correct answer: B — Towards the center of the circle

    Centripetal acceleration is always directed towards the center of the circular path, which is the center of the circle.

  7. Q7. The centripetal acceleration of an object moving in a circle of radius R at a constant speed v is given by the formula v²/R. If the speed of the object is doubled while the radius of the circle remains the same, what happens to the centripetal acceleration?

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

    Correct answer: B — It is doubled

    Centripetal acceleration (a_c = v²/R). If v is doubled (2v), the new acceleration will be (2v)²/R = 4v²/R, which is four times the original acceleration.

  8. Q8. In a body executing uniform circular motion, what force is responsible for maintaining this motion?

    • AGravitational force
    • BCentrifugal force
    • CCentripetal force
    • DFriction force
    Show answer & explanation

    Correct answer: C — Centripetal force

    The force directed towards the center necessary to cause circular motion is called the centripetal force.

  9. Q9. A particle moves in a circular path with constant speed. The net force acting on the particle is directed towards the center of the circle. This force is known as the:

    • ACentripetal force
    • BGravitational force
    • CCentrifugal force
    • DTangential force
    Show answer & explanation

    Correct answer: A — Centripetal force

    The net force required to cause an object to move in a circular path is directed towards the center of the circle and is called the centripetal force.

  10. Q10. If the speed of an object moving in a circle is doubled, the required centripetal force will be:

    • AOne-fourth of the original force
    • BHalf of the original force
    • CDouble the original force
    • DFour times the original force
    Show answer & explanation

    Correct answer: D — Four times the original force

    Centripetal force F_c = mv²/r. If v is doubled, the force becomes m(2v)²/r = 4(mv²/r), so the force becomes four times the original value.

  11. Q11. An object moves in a circle at a constant speed. Which statement accurately describes the nature of the acceleration experienced by the object?

    • AThe acceleration is directed tangentially to the path.
    • BThe acceleration is directed towards the center of the circle.
    • CThe acceleration is zero because the speed is constant.
    • DThe acceleration is solely due to friction.
    Show answer & explanation

    Correct answer: B — The acceleration is directed towards the center of the circle.

    In uniform circular motion, although the speed is constant, the direction of the velocity is continuously changing, meaning there is a non-zero acceleration directed towards the center of the circle, which is the centripetal acceleration.

  12. Q12. When a body is executing uniform circular motion, the acceleration experienced by the body is directed towards which direction?

    • AOpposite to the velocity vector
    • BPerpendicular to the plane of motion
    • CTangential direction
    • DRadial direction (towards the center)
    Show answer & explanation

    Correct answer: D — Radial direction (towards the center)

    In uniform circular motion, even though the speed is constant, the direction of the velocity is constantly changing, meaning there is an acceleration directed towards the center of the circle. This is known as centripetal acceleration, which is directed radially inward.

  13. Q13. If a body moves in a circle of radius R with a constant speed V, the required centripetal acceleration is given by:

    • AR/V
    • BV/R
    • CV²/R
    • DR/V²
    Show answer & explanation

    Correct answer: C — V²/R

    The formula for centripetal acceleration (a_c) in uniform circular motion is a_c = v²/r. Since v=V and r=R, the acceleration is V²/R.

  14. Q14. A stone of mass 500 g is whirled in a vertical circle. The tension in the string providing the necessary centripetal force is directed:

    • ATowards the center of the circle
    • BTangential to the circle
    • CPerpendicular to the velocity vector
    • DAway from the center of the circle
    Show answer & explanation

    Correct answer: A — Towards the center of the circle

    In uniform circular motion, the required centripetal force (and thus the tension in the string providing this force) must always be directed towards the center of the circular path.

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