- Amal Augustine
- December 23, 2025
Torque Control and Rotational Dynamics MCQs: Smart and Powerful MCQs for Conservation Law Mastery
Torque control and rotational dynamics MCQs play a crucial role in building conceptual strength in higher-secondary and competitive physics examinations. These torque control and rotational dynamics mcqs questions test a student’s understanding of how torque, angular momentum, centre of rotation, and conservation principles govern rotational systems. From rotating stools and spinning planets to doors, wheels, and gymnasts, such torque control and rotational dynamics MCQs connect mathematical formulation with physical intuition. Practicing torque control and rotational dynamics MCQs helps learners distinguish between force and torque, understand conditions for conservation of angular momentum, and accurately analyze rotational equilibrium and motion.
Torque control and rotational dynamics MCQs focus on how rotational motion is governed by torque rather than force alone. These torque control and rotational dynamics mcqs questions test the understanding of angular momentum conservation, moment of inertia, and the conditions under which rotational systems speed up or slow down. By combining torque control with rotational dynamics MCQs, students learn how changing mass distribution, external torque, or radius affects angular velocity and angular acceleration.
Torque Control and Rotational Dynamics MCQs
1.
Total angular momentum of a rotating body remains constant if the net torque acting on it is:
A) Maximum
B) Minimum
C) Unity
D) Zero
Answer: D
2.
A person on a rotating stool folds his arms. His angular momentum about the axis of rotation:
A) Increases
B) Decreases
C) Remains unchanged
D) Doubles
Answer: C
3.
The angular momentum of a rotating body is directed:
A) Along the radius vector
B) Parallel to linear momentum
C) In the orbital plane
D) Perpendicular to the plane of rotation
Answer: D
4.
A viscous fluid dropped on a rotating platform causes angular velocity to:
A) Decrease continuously
B) Decrease initially, then increase
C) Remain unchanged
D) Increase continuously
Answer: B
5.
Motion of planets around the Sun demonstrates conservation of:
A) Mass
B) Linear momentum
C) Angular momentum
D) Energy
Answer: C
6.
Change in angular momentum from 1 J to 5 J in 5 s gives torque:
A) 5/3
B) 4/5
C) 4
D) None
Answer: B
7.
Centre of mass of a given system is most likely located at:
A) A
B) B
C) C
D) D
Answer: B
8.
Torque produced by force
F = 5i + 2j − 5k
and position vector
r = i − 2j + k is:
A) 8i + 10j + 12k
B) 8i − 10j − 8k
C) 10i − 10j − k
D) Zero
Answer: A
9.
A door requires 1 N at 1.6 m. Force required at 0.4 m is:
A) 1.2 N
B) 2.4 N
C) 3.6 N
D) 4 N
Answer: D
10.
When torque on a system is zero, which remains constant?
A) Force
B) Linear impulse
C) Linear momentum
D) None
Answer: D
11.
A gymnast lowers his arms while rotating. Which decreases?
A) Angular velocity
B) Moment of inertia
C) Angular momentum
D) Kinetic energy
Answer: B
12.
Conservation of angular momentum requires:
A) Zero external force
B) Zero external torque
C) Zero force and torque
D) No condition
Answer: B
13.
Angle between linear momentum and angular momentum in circular motion:
A) 0°
B) 45°
C) 90°
D) 180°
Answer: C
14.
If KE becomes four times, angular momentum becomes:
A) L/4
B) L/2
C) L
D) 2L
Answer: C
15.
If torque is zero, angular momentum is:
A) Constant in magnitude only
B) Constant in direction only
C) Constant in both
D) Zero
Answer: A
16.
Angular momentum of a particle with constant acceleration varies as:
A) Constant
B) Time
C) 1/time
D) Distance
Answer: B
17.
Motion of particles in solar system conserves:
A) Mass
B) Momentum
C) Angular momentum
D) Energy
Answer: C
18.
Torque per unit moment of inertia equals:
A) Angular velocity
B) Angular acceleration
C) Radius of gyration
D) Inertia
Answer: B
19.
If torque is zero, what is conserved?
A) Energy
B) Linear momentum
C) Angular momentum
D) Force
Answer: C
20.
Angular momentum is a:
A) Scalar
B) Polar vector
C) Axial vector
D) Tensor
Answer: C
21.
Angular momentum direction for planar rotation is:
A) Tangential
B) Radial
C) Perpendicular to plane
D) Along velocity
Answer: C
22.
Halving radius at constant angular velocity changes L to:
A) L/4
B) L/2
C) L
D) 3L
Answer: A
23.
Switching off external torque keeps which unchanged?
A) Linear momentum
B) Angular momentum
C) Both
D) Neither
Answer: B
24.
Initial angular acceleration of a rod released horizontally is:
A) 2g/3l
B) mgl/2
C) 3gl/2
D) 3g/2l
Answer: D
25.
Correct matching is:
A) A-II, B-I, C-IV, D-III
B) A-I, B-II, C-IV, D-III
C) A-II, B-I, C-III, D-IV
D) A-I, B-II, C-III, D-IV
Answer: A
26.
Radius of gyration of solid cylinder about axis is:
A) R
B) R/√2
C) 2R
D) √2R
Answer: B
27.
The moment of inertia of a body depends on
A. its angular velocity only
B. its mass only
C. the distribution of mass about the axis of rotation
D. the applied torque
Answer: C
28.
If the net external torque acting on a rotating system is zero, then
A. angular velocity becomes zero
B. angular acceleration becomes zero
C. angular momentum remains conserved
D. rotational kinetic energy becomes zero
Answer: C
29.
The rotational analogue of Newton’s second law is
A. τ = Iω
B. τ = Iα
C. L = Iω
D. τ = dω/dt
Answer: B
30.
A flywheel stores energy mainly due to its
A. large mass
B. high angular acceleration
C. large moment of inertia and angular speed
D. applied torque
Answer: C
Conclusion
Torque control and rotational dynamics MCQs strengthen a student’s ability to apply conservation laws, vector reasoning, and rotational kinematics in real-world scenarios. These torque control and rotational dynamics mcqs problems emphasize that rotational motion is governed not just by force, but by how and where that force acts. Mastery of such torque control and rotational dynamics MCQs builds deep conceptual clarity, reduces calculation errors, and enhances confidence for competitive exams like JEE, NEET, and state-level tests. Consistent torque control and rotational dynamics mcqs practice ensures a strong foundation in rotational mechanics and energy conservation principles.
Such torque control and rotational dynamics MCQs strengthen problem-solving skills by linking physical concepts like spinning stools, rotating discs, and rolling wheels to mathematical relations. Practicing torque control and rotational dynamics MCQs helps learners confidently analyze real-world rotational systems using conservation laws and vector principles.
Amal Augustine is the founder of ExQuizMe, a dynamic learning and quiz platform built to make education engaging, competitive, and fun. A passionate learner and an academic achiever, Amal completed his schooling at Government HSS Manjapra, graduating with 92.5% in Computer Science. He later earned his degree from St. Stephen’s College, University of Delhi, one of India’s most prestigious arts and science institutions.
Currently, Amal is pursuing his Master’s degree at National Sun Yat-sen University, Taiwan, where he continues to deepen his interest in research and technology. Throughout his school and college years, he won 50+ national-level interschool and collegiate quiz competitions, was
Beyond academics, Amal Augustine is an avid reader of science journals, a dedicated research student, and a technology enthusiast who loves programming and exploring the world of Computer Science. Through ExQuizMe, he aims to make learning accessible, enjoyable, and empowering for students across the globe.