AIIMS 2017 Physics Degrees of Freedom Assertion Reason Question
In the following questions, a statement of assertion is given followed by a corresponding statement of reason. Assertion: Molecules of monoatomic gas has three degrees of freedom. Reason: Molecules of diatomic gas has five degrees of freedom.
If both assertion and reason are true and reason is correct explanation of assertion.
If both assertion and reason are true and reason is not correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
The assertion is true because monoatomic gases, such as helium (He) or neon (Ne), possess three translational degrees of freedom, corresponding to motion along the x, y, and z axes. However, the reason is false; diatomic gases, like oxygen (O₂) or nitrogen (N₂), actually have five degrees of freedom (three translational and two rotational) at room temperature, not five degrees of freedom due to vibrational modes, which become significant at higher temperatures. Options A and B are incorrect as they require both statements to be true, and option D is incorrect because the assertion is indeed true.
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