Centre of the Mass (Two-Particle System, Rigid Body) NEET Questions

Physics - Rotational Motion

Centre of the Mass (Two-Particle System, Rigid Body) MCQ Questions


7.

In the absence of external forces, the motion of the center of mass of a system is:

A.

Parabolic

B.

Linear

C.

Circular

D.

Elliptical

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ANSWER :

B. Linear

8.
A uniform disc and a uniform ring of equal mass and radius have their centers of mass at:
A.
Same point
B.
Different points
C.
Depends on shape
D.
Depends on density
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ANSWER :
A. Same point
9.

Three particles of masses 1 kg, 2 kg, and 3 kg are placed at the corners of an equilateral triangle of side 1 m. The center of mass of the system is at a distance from the 1 kg mass:

NEET - 2020

A.

0.5 m

B.

0.6 m

C.

0.7 m

D.

0.8 m

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ANSWER :

C. 0.7 m

10.

A projectile explodes in mid-air into two fragments. The center of mass of the system:

A.

Follows a new trajectory

B.

Comes to rest immediately at the point of explosion

C.

Moves in the original trajectory

D.

Moves randomly

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ANSWER :

C. Moves in the original trajectory

11.
In a rigid body, the distance between particles:
A.
Changes
B.
Remains fixed
C.
Deforms
D.
Changes depending on motion
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ANSWER :
B. Remains fixed
12.
The velocity of the center of mass of a system of particles is given by:
A.
Sum of individual velocities
B.
Product of individual masses
C.
Mass-weighted average of velocities
D.
Depends on forces
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ANSWER :
C. Mass-weighted average of velocities