AIIMS 201925 May
- Exam
- AIIMS
- Year
- 2019
- Date
- 25 May
- Subject
- Physics
- Chapter
- Kinetic Theory of Gases
AIIMS 2019 · 25 May · Physics · Kinetic Theory of Gases
Assertion : Equal masses of helium and oxygen gases are given equal...
Assertion : Equal masses of helium and oxygen gases are given equal quantities of heat. The rise in temperature of helium is greater than that in the case of oxygen.
Reason: The molecular mass of oxygen is more than the molecular mass of helium.
Options
- AIf both assertion and reason are true and reason is the correct explanation of assertion.
- BIf both assertion and reason are true but reason is not the correct explanation of assertion.
- CIf assertion is true but reason is false.
- DIf both assertion and reason are false.
Correct answer
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
Step-by-step solution
Heat given to helium is totally used up in increasing the translation energy of its molecules since it is a monoatomic gas. On the other hand, in case of oxygen, which is a diatomic gas, heat is used up in increasing the translational, rotational and vibrational energies of its molecules. The rise in temperature of a gas is due to only increase in translational energy of its molecules.