Which expression gives the centripetal acceleration of a body moving in a circle of radius r with angular speed ω?
Correct answer A. rω²
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Rotational and Circular Motion MCQs
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What is the SI unit of angular acceleration?
Correct answer C. rad s⁻²
Why are only very small angular displacements treated as vectors?
Correct answer B. Large angular displacements do not obey the commutative law of vector addition
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Which relation links the tangential acceleration aₜ of a point at radius r to the angular acceleration α?
Correct answer A. aₜ = rα
A rigid disc rotates about its centre. How do the angular and linear speeds of points on it compare?
Correct answer C. All points have the same angular speed, but linear speed increases with distance from the centre
Which vector relation correctly links linear velocity v, angular velocity ω and position vector r for circular motion?
Correct answer C. v = ω × r
What is the direction of the angular velocity vector of a rotating body?
Correct answer B. Along the axis of rotation, given by the right-hand rule
Approximately how many degrees are there in one radian?
Correct answer D. 57.3°
One complete revolution is equal to ____
Correct answer D. 2π rad
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How is one radian defined?
Correct answer D. The angle subtended at the centre of a circle by an arc equal in length to the radius