System of Particles and Rotational Motion Practice Questions
Class 11 · Physics · 1251 free MCQs with instant results and detailed explanations.
1251
Total
510
Easy
567
Medium
174
Hard
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Topics in System of Particles and Rotational Motion
Centre of Mass
331
Torque
250
Angular Momentum
300
Moment of Inertia
370
Sample Questions from System of Particles and Rotational Motion
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
Which of the following statements is true regarding the center of mass of a uniform rod of length L and mass M?
A.
The center of mass is at L/2 from one end.
B.
The center of mass is at L from one end.
C.
The center of mass is at L/4 from one end.
D.
The center of mass is at the end of the rod.
Show Answer & Explanation
Correct Answer: A
For a uniform rod, the center of mass is located exactly at its midpoint, which is at L/2 from either end.
Q2
Easy
What is the center of mass of a uniform rod of length L?
A.
L/2
B.
L/3
C.
L/4
D.
L
Show Answer & Explanation
Correct Answer: A
For a uniform rod, the center of mass is located at the midpoint.
Q3
Easy
Which of the following statements about the center of mass is true?
A.
It is always located within the body
B.
It can be outside the body
C.
It is always at the geometric center
D.
It is only defined for solid objects
Show Answer & Explanation
Correct Answer: B
The center of mass can indeed be outside the physical body, as in the case of a ring.
Q4
Medium
If the center of mass of a system is at rest, what can we conclude about the momentum of the system?
A.
It is zero
B.
It is constant
C.
It is increasing
D.
It is decreasing
Show Answer & Explanation
Correct Answer: B
The momentum of a system remains constant if there are no external forces acting on it, regardless of the center of mass being at rest.
Q5
Medium
In a rotating system, if the moment of inertia increases while the angular momentum remains constant, what happens to the angular velocity?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes zero
Show Answer & Explanation
Correct Answer: B
Angular momentum (L = IĻ) is constant; if I increases, Ļ must decrease to maintain a constant product.
Q6
Medium
A disc and a ring of the same mass are rolling down an incline. Which will reach the bottom first?
A.
The disc
B.
The ring
C.
Both reach at the same time
D.
Depends on the angle of incline
Show Answer & Explanation
Correct Answer: A
The disc has lower moment of inertia than the ring, allowing it to accelerate faster down the incline.
Q7
Medium
What happens to the center of mass of a system when an internal force acts between two particles?
A.
It moves
B.
It stays stationary
C.
It accelerates
D.
It changes direction
Show Answer & Explanation
Correct Answer: B
According to Newton's Third Law, internal forces do not affect the center of mass motion of the system.
Q8
Hard
A system consists of two particles of masses m1 and m2 located at positions x1 and x2 respectively. The center of mass of the system is located at which of the following positions?
A.
(m1*x1 + m2*x2)/(m1 + m2)
B.
(m1*x2 + m2*x1)/(m1 + m2)
C.
(x1 + x2)/2
D.
m1*x1 - m2*x2
Show Answer & Explanation
Correct Answer: A
The center of mass of a system of particles is calculated using the weighted average of their positions based on their masses.
Q9
Hard
If three particles with masses m1, m2, and m3 are in equilibrium, which of the following statements is true about their center of mass?
A.
It coincides with the centroid of the configuration.
B.
It is outside the triangle formed by their positions.
C.
It lies on the vertex of one of the particles.
D.
It can lie anywhere in space.
Show Answer & Explanation
Correct Answer: A
In equilibrium, the center of mass of a system of particles coincides with the centroid in a symmetric arrangement.
Q10
Hard
Four particles, each of mass 1 kg, are placed at the vertices of a square of side 1 m. Where is the center of mass of the system located?
A.
(0.5 m, 0.5 m)
B.
(1 m, 1 m)
C.
(0, 0)
D.
(0.25 m, 0.25 m)
Show Answer & Explanation
Correct Answer: A
The center of mass for symmetric arrangements, like a square, is at the centroid, which is at (0.5 m, 0.5 m).
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System of Particles and Rotational Motion ā Class 11 Physics Practice Questions Online
This page contains 1251 practice MCQs for the chapter System of Particles and Rotational Motion in Class 11 Physics. The questions are organized by difficulty ā 510 easy, 567 medium, 174 hard ā so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 4 topics, giving you comprehensive coverage of the entire chapter.