# Rotational Dynamics MCQs with Answers Pdf Download

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## Rotational Dynamics MCQs with Answers Class 12:

**1. The moment of inertia of a body does not depend upon the________**

(a) mass of the body

(b) position of the axis of rotation

(c) distribution of the mass

(d) the angular acceleration of the body

**Answer: D**

**Read:** Physics NEET MCQs

**2. The SI unit of moment of inertia is________**

(a) gram-cm²

(b) kg-m²

(c) kg/m²

(d) kg-m

**Answer: B**

**3. The dimensional formula for the moment of inertia of a body is______**

(a) L⁰M¹T-²

(b) L²M¹T⁰

(c) L¹M¹T-¹

(d) L⁰M²T-¹

**Answer: B**

**4. The dimensional formula for the radius of gyration of a body is______**

(a) L⁰M⁰T⁰

(b) L¹M⁰T⁰

(c) L¹M¹T⁰

(d) L⁰M²T-¹

**Answer: B**

**5. The SI unit of torque is_______**

(a) N/m

(b) Nm²

(c) N-m

(d) N²m

**Answer: C**

**6. Which is the axial vector from the following?**

(a) Linear Momentum

(b) Torque

(c) Velocity

(d) Acceleration

**Answer: B**

**7. The rotational analogue of force is_________**

(a) Moment of Inertia

(b) Angular Momentum

(c) Torque

(d) Angular Acceleration

**Answer: C**

**8. The physical quantity in translational motion, which is analogous to torque in rotational motion is________**

(a) Mass

(b) Linear Momentum

(c) Force

(d) Work

**Answer: C**

**9. Torque per unit moment of inertia is________**

(a) Radius of gyration

(b) Angular velocity

(c) Angular displacement

(d) Angular acceleration

**Answer: D**

**10. The physical quantity in translational motion, which is analogous to the moment of inertia in rotational motion is________**

(a) Velocity

(b) Force

(c) Energy

(d) Mass

**Answer: D**

**11. Moment of inertia depends upon________**

(a) position of the axis of rotation

(b) distribution of particles

(c) mass

(d) all of these

**Answer: D**

**12. If all the ice on the polar caps of the earth melts, due to global warming then the day will be________**

(a) 24 hours

(b) more than 24 hours

(c) less than 24 hours

(d) 12 hours

**Answer: B**

**13. Which of the following types of circular bodies, Same mass and radius will have the largest moment of inertia?**

(a) Solid disc

(b) Cylindrical disc

(c) Ring

(d) Annular disc

**Answer: C**

**14. A flywheel rotating about a fixed axis has a kinetic energy of 225 J when its angular speed is 30 rad/s. What is the moment of inertia of the flywheel about its axis of rotation?**

(a) 0.5 kg m²

(b) 0.6 kg m²

(c) 0.8 kg m²

(d) 0.3 kg m²

**Answer: A**

**15. The mass of a flywheel is concentrated near its rim. This is done to_______**

(a) decrease its moment of inertia

(b) increase its moment of inertia

(c) increase the strength of the flywheel

(d) increase its linear momentum

**Answer: B**

**16. A wheel of mass 4 kg and radius of gyration 0.4 m is making 300 r.p.m. Its moment of inertia is_______**

(a) 6.4 kg m²

(b) 0.64 kg m²

(c) 0.32 kg m²

(d) 64 kg m²

**Answer: B**

**17. Two circular rings A and B of radii nR and R are made from the same wire. The M.I. of A about an axis passing through the center and perpendicular to the plane of A is 27 times that of the smaller loop B. What is the value of n?**

(a) 2

(b) 3

(c) 4

(d) 5

**Answer: B**

**18. When the speed of a flywheel is increased from 240 r.p.m. to 360 r.p.m., the energy spent is 484 J. What is the moment of inertia of the flywheel?**

(a) 4.9 kg-m²

(c) 2 kg-m²

(b) 9.8 kg-m²

(d) 15 kg-m²

**Answer: A**

**19. A torque of 100 N-m acting on a wheel at rest, rotates it through 200 radians in 10s. What is the moment of inertia of the wheel?**

(a) 10 kg-m²

(b) 15 kg-m²

(c) 20 kg-m²

(d) 25 kg-m²

**Answer: D**

**20. If the external torque acting on a body is zero, then it’s______**

(a) angular momentum is zero

(b) angular momentum is conserved

(c) angular momentum is the maximum

(d) angular acceleration is the maximum

**Answer: B**

**21. When the external torque acting on a system is zero, then there will be a conservation of______**

(a) total energy

(b) angular momentum

(c) linear momentum

(d) mass

**Answer: B**

**22. When a torque acting on a system is increased, then which one of the following quantities will increase?**

(a) linear momentum

(b) Angular momentum

(c) force

(d) Displacement

**Answer: B**

**23. The moment of inertia of a copper disc, rotating about an axis passing through its center and perpendicular to its plane_______**

(a) increases if its temperature is increased

(b) changes in its axis of rotation are changed

(c) increases if its angular velocity is increased

(d) both (a) and (b) are correct

**Answer: D**

**24. when a steady torque acts on a body, the body_______**

(a) rotates at a constant speed

(b) continues in its state of rest or of uniform motion along a straight line

(c) gets a linear acceleration

(d) gets an angular acceleration

**Answer: D**

**25. The moment of inertia of a body is considered only in the case of_________**

(a) Rectilinear motion

(b) Rotational motion

(c) Curvilinear motion

(d) Translational motion

**Answer: B**

**26. When the external torque acting on a rotating body is zero, the quantity that will remain constant is the_________**

(a) linear momentum

(b) angular momentum

(c) force

(d) linear displacement

**Answer: B**

**27. Which is the wrong relation from the following?**

(a) Force = Mass x Acceleration

(b) Torque = Moment of Inertia x Angular Acceleration

(c) Moment of Inertia = Torque x Angular Acceleration

(d) Angular Momentum = Moment of Inertia x Angular Velocity

**Answer: C**

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