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.
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Read the Rotational and Circular Motion notesFree MDCAT chapter notes with key terms521 questions · page 3 of 27
- A. WA. 180°
- B. 0°
- C. 90°
- D. 45°
Explanation: For circular motion, linear velocity is tangent to the path, while angular velocity points along the rotation axis.
Correct answer: 90°- A. along the axis of rotation
- B. along the tangent
- C. directed towards the centre
- D. directed away from the centre
Explanation: The instantaneous linear velocity of a point on a circular path is tangent to the circle at that point.
Correct answer: along the tangent- A. T = πv
- B. T = πw
- C. T = 2πr
- D. T = 2πr/v
Explanation: The period is the time for one revolution, whose distance is the circumference 2πr m.
Correct answer: T = 2πr/v- A. 42000km
- B. 36000km
- C. 24000 km
- D. 18000 km
Explanation: A geostationary orbit has an orbital radius of about 42,000 km measured from Earth's centre.
Correct answer: 42000km- A. 3 hours
- B. 6 hours
- C. 12 hours
- D. 24 hours
Explanation: A geostationary satellite must have the same angular speed as Earth's rotation, completing one revolution in Earth's rotational period.
Correct answer: 24 hours- A. 8 Kms-1
- B. 8.1 Kms-1
- C. 7.9 Kms-1
- D. 8 ms-1
Explanation: The speed needed for a low Earth satellite is v = √(GM/r), which gives approximately 7.9 km s-1 near Earth's surface.
Correct answer: 7.9 Kms-1- A. Acceleration
- B. Linear acceleration
- C. Angular acceleration
- D. Direction of motion of the body
Explanation: Torque is the rotational analogue of force and produces angular acceleration according to τ = Iα, where τ is torque in N m, I is moment of…
Correct answer: Angular acceleration- A. N.m
- B. joule
- C. Both a and b are correct
- D. Neither a nor b is correct
Explanation: Torque equals force multiplied by perpendicular distance, so its SI unit is N m: N x m = kg m s^-2 x m = kg m² s^-2.
Correct answer: N.m- A. [ML2T-2]
- B. [MLT-2]
- C. [ML2T]
- D. [ML-2T-2]
Explanation: Torque is force multiplied by distance, so its dimensions are [MLT^-2] x [L] = [ML2T^-2].
Correct answer: [ML2T-2]- A. Can produce torque
- B. Cannot produce torque
- C. Some time can produce torque some time cannot
- D. Has no relation with torque
Explanation: A central force acts along the line joining the body to the centre, so the position vector and force are parallel.
Correct answer: Cannot produce torque51. It is easier to turn a steering wheel with both hands than with a single hand because______________?
- A. Accelerating force increases on the wheel
- B. Two forces act on the wheel
- C. Two hands provide a firm grip
- D. The couple acts on the wheel
Explanation: Using both hands can produce a couple, in which two equal and opposite forces act along different lines and create a turning effect.
Correct answer: The couple acts on the wheel- A. Torque and energy
- B. Momentum and impulse
- C. Energy and work
- D. Mass and moment of inertia
Explanation: Torque and energy both have dimensions ML²T^-2, momentum and impulse both have dimensions MLT^-1, and energy and work both have dimensions…
Correct answer: Mass and moment of inertia- A. light year
- B. radian
- C. angstrom
- D. micron
Explanation: A light year, angstrom and micron are units of length: approximately 9.46 × 10^15 m, 10^-10 m and 10^-6 m respectively.
Correct answer: radian- A. Vibratory motion
- B. Linear motion
- C. Rotatory motion
- D. Angular motion
Explanation: When motion is described by the angle swept out in a given time, the relevant quantity is angular motion, or angular displacement per time…
Correct answer: Angular motion- A. π /3 x r
- B. π/6 x r
- C. V/30 x r
- D. π / 180 x r
Explanation: The arc distance travelled by a point on the rim is s = rθ, with θ measured in radians. Since 30° = 30π/180 = π/6 rad, s = r × π/6 = πr/6.
Correct answer: π/6 x r- A. π radian
- B. 2π radian
- C. π/2 radian
- D. 4π radian
Explanation: One complete turn covers the full circumference and corresponds to an angular displacement of 2π radians.
Correct answer: 2π radian- A. 67.3°
- B. 57.3°
- C. 87.3°
- D. 60°
Explanation: One radian is the angle subtended when the arc length equals the radius, and its degree measure is 180°/π = 57.3°.
Correct answer: 57.3°- A. Plane angle
- B. Solid angle
- C. Both plane angle and solid angle
- D. Neither plane angle nor solid angle
Explanation: A steradian measures a solid angle, defined by the area cut out on a sphere divided by the square of its radius.
Correct answer: Solid angle- A. π
- B. 3π
- C. 6π
- D. 12π
Explanation: A rate of 360 revolutions per minute is 360/60 = 6 revolutions per second.
Correct answer: 12π- A. π
- B. π/2
- C. π/30
- D. π/180
Explanation: The seconds hand completes 1 revolution, or 2π rad, in 60 s. Its angular speed is therefore ω = 2π rad/60 s = π/30 rad s^-1.
Correct answer: π/30