Free Rotational and Circular Motion MCQs with Answers
521 Rotational and Circular Motion MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Angular displacement and angular velocity describe rotation, with angles measured in radians and related to time through angular speed. The connection between angular and linear quantities includes arc length, tangential speed and centripetal acceleration, so circular motion is not confused with motion at constant velocity.
Last updated
Read the Rotational and Circular Motion notesFree MDCAT chapter notes with key terms521 questions · page 2 of 27
- A. One-fourth revolution
- B. One-third revolution
- C. One half revolution
- D. One complete revolution
Explanation: A full revolution is 360 degrees, so 90 degrees is a quarter of it, equivalent to pi over 2 radians.
Correct answer: One-fourth revolution- A. Spin motion
- B. Orbital motion
- C. Rectilinear motion
- D. Translatory motion
Explanation: When a body rotates about an axis passing through itself, its particles move around that internal axis, and the motion is called spin…
Correct answer: Spin motion- A. v=rw
- B. r=vw
- C. s=r
- D. ∆s/∆t
Explanation: For a point at distance r from the axis, linear speed is related to angular speed by v = rω, where v is in m/s, r is in m, and ω is in…
Correct answer: v=rw- A. 70 km/s
- B. 60 km/s
- C. 45 km/s
- D. 30 km/s
Explanation: Earth travels around the Sun at an average orbital speed of about 30 km/s.
Correct answer: 30 km/s25. An artificial satellite revolves round the Earth in circular orbit, which quantity remains constant?
- A. Angular Momentum
- B. Angular Displacement
- C. Linear Velocity
- D. None of the above
Explanation: In a circular orbit under a central gravitational force, the force produces no torque about the Earth's centre, so angular momentum…
Correct answer: Angular Momentum- A. 0
- B. π2
- C. 2 π2
- D. 4 π2
Explanation: The speed is circumference divided by time: v = 2π(1.0 m) ÷ 2.0 s = π m/s.
Correct answer: π2- A. magnitude
- B. direction
- C. both
- D. None of these
Explanation: In uniform circular motion, the speed's magnitude remains constant but its velocity changes direction continuously, producing centripetal…
Correct answer: direction- A. Moment
- B. Momentum
- C. Torque
- D. None of these
Explanation: The turning effect of a force about a pivot is called torque, with magnitude τ = force x perpendicular distance and unit N m.
Correct answer: Torque- A. 365 days
- B. 730 days
- C. 329 days
- D. 129 days
Explanation: For circular planetary orbits, Kepler’s third law gives T proportional to r^3/2.
Correct answer: 129 days- A. 4
- B. 3
- C. 2
- D. 5
Explanation: Three properly placed geostationary communication satellites can provide continuous coverage of the Earth because each satellite covers…
Correct answer: 3- A. An inertial frame of reference
- B. Non-inertial frame
- C. Neither inertial nor non-inertial
- D. Both inertial and non-inertial
Explanation: A satellite moving in a circular orbit continually changes the direction of its velocity, so it has centripetal acceleration toward Earth.
Correct answer: Non-inertial frame- A. Venus
- B. Mercury
- C. Uranus
- D. Sun
Explanation: In the conventional school-level comparison of planetary orbits, Venus is regarded as Earth’s nearest neighboring planet because its orbit…
Correct answer: Venus- A. At the highest point
- B. At the lowest point
- C. At any point during motion
- D. At the point where gravity is not acting
Explanation: At the lowest point of a vertical circle, the stone has its greatest speed because it has lost the most gravitational potential energy.
Correct answer: At the lowest point- A. 1N
- B. 10N
- C. 2N
- D. 100N
Explanation: The required centripetal force, often described as an apparent outward centrifugal force in the rotating frame, has magnitude F = mv2/r.
Correct answer: 1N- A. F=ma
- B. F=τp/It
- C. Στ = I α
- D. All above
Explanation: The rotational form of Newton’s second law is Στ = Iα, where torque is the rotational equivalent of force, moment of inertia is the…
Correct answer: Στ = I α- A. the centripetal force upon him is less than limiting friction
- B. the centripetal force upon him is greater than limiting friction
- C. the centripetal force upon him is equal to the limiting friction
- D. the friction between the tyres of the cycle and road vanishes
Explanation: For circular motion, static friction supplies the required centripetal force up to its limiting value.
Correct answer: the centripetal force upon him is greater than limiting friction- A. 2π
- B. π/2
- C. π
- D. 20π
Explanation: The wheel's circumference is πd = π x 1 m = π m, and 30 revolutions per minute equals 0.5 revolutions per second.
Correct answer: π/2- A. Gravitational force
- B. Frictional force
- C. Coulomb force
- D. Centripetal force
Explanation: A planet needs centripetal acceleration to remain in orbit, and the gravitational force of the Sun provides this inward force.
Correct answer: Gravitational force- A. mV/r2
- B. mV/r
- C. mV2/r
- D. mV2/r2
Explanation: For circular motion, the required centripetal acceleration is v²/r, so Newton's second law gives F = m(v²/r) = mV²/r.
Correct answer: mV2/r- A. Mass of a body
- B. Velocity of body
- C. The tension in the string
- D. Centripetal acceleration
Explanation: In horizontal circular motion, the inward force required for centripetal acceleration is supplied by the string's tension.
Correct answer: The tension in the string