System of Particles and Rotational Motion MCQ Question with Answers Class 11 Physics

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Understanding the System of Particles and Rotational Motion in Class 11 Physics is essential for mastering mechanics. This topic explores concepts like the center of mass, torque, angular momentum, and rotational dynamics, forming the foundation for advanced physics studies. Students often encounter questions on these topics through system of particles and rotational motion MCQs , which are crucial for competitive exams and board preparation.

Practicing Class 11 Physics MCQs on System of Particles and Rotational Motion helps clarify key ideas, such as the moment of inertia, conservation of angular momentum, and rotational equilibrium. For quick revision, students can use rotational motion multiple-choice questions with detailed answers to strengthen their understanding.

Key areas include solving system of particles MCQs with answers, exploring rotational dynamics quizzes, and tackling System of Particles and Rotational Motion objective questions. These practice materials not only enhance problem-solving skills but also ensure thorough preparation for exams. Dive into this content and master Chapter 7 Physics effectively!

Class 11 System of Particles and Rotational Motion Overview

Class 11 Physics chapter 7 System of Particles and Rotational Motion focuses on the motion of objects as a whole or in parts and introduces the concept of rotational dynamics. It extends our understanding of linear motion to systems of particles and rotating bodies, helping us analyze how objects behave in the physical world.

Center of Mass: The center of mass is the point where the entire mass of a system can be considered to act. It simplifies the study of motion for complex systems by reducing them to a single equivalent point. For example, the center of mass of a uniform rod lies at its midpoint.

Rotational Motion: Unlike translational motion, rotational motion occurs when an object spins about an axis. A familiar example is a spinning top or the wheels of a moving vehicle. To understand this motion, the concepts of angular displacement, angular velocity, and angular acceleration are introduced.

Moment of Inertia: Moment of inertia (MOI) measures how the mass of a body is distributed about the axis of rotation. It plays a role in determining how difficult it is to change an object’s rotational motion. For instance, a disc and a hoop with the same mass will roll differently due to their distinct moments of inertia.

Torque and Angular Momentum: Torque is the rotational counterpart of force. It is responsible for causing rotational motion. Angular momentum describes the rotational motion of a body and remains conserved if no external torque acts on the system, much like linear momentum in translational motion.

Rolling Motion: Rolling motion combines both translational and rotational motion, as seen in a rolling ball or a car tire. This motion requires understanding the balance between linear and angular velocities.

Applications in Real Life: This chapter explains essential principles behind the functioning of various systems, such as how athletes maintain balance, how wheels and gears operate, and why objects like gyroscopes are used for navigation.

Class 11 System of Particles and Rotational Motion MCQ with Answers

MCQs on Class 11 Chapter 7: System of Particles and Rotational Motion

Check the multiple-choice questions for the 11th Class Physics System of Particles and Rotational Motion chapter. Each MCQ has four options, and only one is correct. Select the correct option and check the answer provided.

1. The rotational inertia of a rigid body is referred to as its _________________.

Moment of energy
Moment of force
Moment of inertia
Moment of acceleration

Answer: (c) Moment of inertia

Explanation: The rotational inertia of a body, also known as the moment of inertia, determines how much resistance the body has to rotational motion. It depends on the mass distribution of the body.

2. If a body is rotating about an axis passing through its centre of mass, the angular momentum of the body is directed along its _________________.

Circumference
Radius
Axis of rotation
None of the options

Answer: (c) Axis of rotation

Explanation: When a body rotates around an axis passing through its center of mass, its angular momentum is directed along the axis of rotation, following the right-hand rule.

3. Linear velocities of all the particles of the body in rotational motion is _________________.

0
Same
Different

Answer: (d) Different

Explanation: In rotational motion, the linear velocity of each particle depends on its distance from the axis of rotation. Thus, the linear velocities are different for different particles.

4. The centre of mass of a body

lies inside the body
lies outside the body always
lies on the surface of the body always
None of the options

Answer: (c) lies on the surface of the body always

Explanation: The centre of mass can lie inside or on the surface of a body depending on its shape and mass distribution, but it doesn’t necessarily lie outside the body.

5. Centre of mass of an isolated system has a _________________.

Increasing velocity
Constant velocity
Decreasing velocity
None of the options

Answer: (b) Constant velocity

Explanation: In an isolated system, without any external forces, the center of mass moves with constant velocity (conservation of momentum).

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6. Dimensional formula for moment of inertia is _________________ .

Answer: (d) ML²

Explanation: Moment of inertia has dimensions of mass (M) and the square of distance (L²), which gives the dimensional formula ML².

7. Radius of gyration is denoted by _________________ .

Answer: (c) K

Explanation: The radius of gyration is represented by the symbol ‘K’ and indicates how mass is distributed relative to the axis of rotation.

8. A body in rotational motion possesses rotational kinetic energy given by _________________.

Answer: (b)

9. The combination of rotational motion and the translational motion of a rigid body is known as _________________.

Frictional motion
Axis motion
Angular motion
Rolling motion

Answer: (d) Rolling motion

Explanation: Rolling motion occurs when both translational motion and rotational motion happen simultaneously, such as when a wheel rolls on the ground.

10. State true or false: The position of centre of mass does not depend upon the shape, size, and distribution of the mass of the body.

True
False

Answer: (b) False

Explanation: The position of the center of mass is influenced by the shape, size, and mass distribution within a body, meaning it does depend on these factors.

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