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

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

1.

What is the position of the center of mass of a two-particle system?

A.

Always at the midpoint of the line joining the two masses, regardless of their values

B.

Always lies on the line joining the two masses, closer to the heavier mass, at a point dividing the line in the inverse ratio of the masses

C.

Always coincides exactly with the position of the heavier mass

D.

Independent of the masses; depends only on the distance between them

ANSWER :

B. Always lies on the line joining the two masses, closer to the heavier mass, at a point dividing the line in the inverse ratio of the masses

2.

If two masses are equal in a two-particle system, the center of mass is located at:

A.

The midpoint between them

B.

One-third the distance from either mass

C.

At one-fourth the distance from the heavier mass

D.

At the position of one of the two masses

ANSWER :

A. The midpoint between them

3.
Which of the following is true about the center of mass of a system?
A.
It always coincides with the geometric center
B.
It can be outside the body
C.
It is always inside the system
D.
It is independent of mass distribution
ANSWER :
B. It can be outside the body
4.

Two particles of masses 3 kg and 6 kg are separated by a distance of 12 m. The center of mass of the system from the 3 kg mass is:

NEET - 2018

A.

4 m

B.

6 m

C.

8 m

D.

9 m

ANSWER :

C. 8 m

5.
For a system of particles, the center of mass moves as if:
A.
Only due to internal forces
B.
Only due to external forces
C.
As if all the mass were concentrated at one point
D.
It is always at rest
ANSWER :
C. As if all the mass were concentrated at one point
6.

A system of two particles of unequal mass is rotating about their center of mass. The heavier particle:

A.

Stops periodically

B.

Moves faster

C.

Moves slower

D.

Remains at rest

ANSWER :

C. Moves slower