Center of Mass Absorb Before You Solve MCQs Systems of Particles and Rotational Motion Physics NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

Q1:

Which of the following points is the likely position of the center of mass of the system shown in the figure?

1. $A$
2. $B$
3. $C$
4. $D$

Subtopic: Center of Mass |

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2

3

4

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Q2:

In the $\mathrm{HCl}$ molecule, the separation between the nuclei of the two atoms is about $1.27~\mathring{\text A}~(1~\mathring{\text A}=10^{10}~\text m).$ Then the approximate location of the CM of the molecule is:
(Given that a chlorine atom is about $35.5$ times as massive as a hydrogen atom and nearly all the mass of an atom is concentrated in its nucleus).

1.	$1.235~\mathring{\text A}$ from $\mathrm{H-}$ atom
2.	$2.41~\mathring{\text A}$ from $\mathrm{Cl-}$ atom
3.	$3.40~\mathring{\text A}$ from $\mathrm{Cl-}$ atom
4.	$1.07~\mathring{\text A}$ from $\mathrm{H-}$ atom

Subtopic: Center of Mass |

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From NCERT

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2

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4

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Q3:

Two blocks are joined by a light spring of spring constant,

k = 1000

$k=1000$ N/m, and are placed at rest on a horizontal frictionless table. A horizontal force of

6

$6$ N acts on the

2

$2$ kg block. The acceleration of the centre-of-mass of the system is:

1.

3

$3$ m/s²
2.

2

$2$ m/s²
3.

1.5

$1.5$ m/s²
4.

4.5

$4.5$ m/s²

Subtopic: Center of Mass |

73%

From NCERT

1

2

3

4

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Q4:

Two particles

A

$A$ and

B

$B$ initially at rest, move toward each other under the mutual force of attraction. At an instance when the speed of

A

$A$ is

v

$v$ and speed of

B

$B$ is

3 v,

$3v,$ the speed of the centre-of-mass will be:
1.

2 v

$2v$
2. zero
3.

v

$v$
4.

4 v

$4v$

Subtopic: Center of Mass |

70%

From NCERT

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