Degrees of Freedom, Law of Equipartition of Energy and Applications to Specific Heat Capacities of Gases NEET Questions

Physics - Kinetic Theory of Gases

Degrees of Freedom, Law of Equipartition of Energy and Applications to Specific Heat Capacities of Gases MCQ Questions


1.
The number of independent coordinates required to completely specify the position of a gas molecule in space is called its:
A.
Degrees of freedom
B.
Vibrational modes
C.
Quantum number
D.
Translational states
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ANSWER :
A. Degrees of freedom
2.
A molecule free to move in three-dimensional space has how many translational degrees of freedom?
A.
1
B.
3
C.
2
D.
5
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ANSWER :
B. 3
3.
A monatomic gas molecule (e.g., argon) has total degrees of freedom equal to:
A.
3 (only translational)
B.
5 (3 translational + 2 rotational)
C.
6 (3 translational + 3 rotational)
D.
2 (only rotational)
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ANSWER :
A. 3 (only translational)
4.
A diatomic molecule treated as a rigid rotator has how many degrees of freedom?
A.
5 (3 translational + 2 rotational)
B.
3 (only translational)
C.
7 (3 translational + 2 rotational + 2 vibrational)
D.
6 (3 translational + 3 rotational)
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ANSWER :
A. 5 (3 translational + 2 rotational)
5.
Why does a diatomic molecule like Oâ‚‚ have only 2 rotational degrees of freedom and not 3?
A.
The third rotational axis is identical to a translational axis
B.
Rotational energy along the bond axis is absorbed by vibrational modes
C.
Rotation along the axis joining the two atoms has negligible moment of inertia for quantum mechanical reasons
D.
Diatomic molecules cannot rotate at all
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ANSWER :
C. Rotation along the axis joining the two atoms has negligible moment of inertia for quantum mechanical reasons
6.
A non-linear polyatomic molecule has how many rotational degrees of freedom?
A.
2
B.
3
C.
0
D.
1
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ANSWER :
B. 3