AIIMS 2018 Physics Escape Velocity MCQ Question
Assertion : Water kept in an open vessel will quickly evaporate on the surface of the moon.
Reason : The temperature at the surface of the moon is much higher than boiling point of the water.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
The statement is incorrect because the escape velocity on the Moon being lower than that on Earth does not directly correlate with the rate of evaporation of water molecules (H₂O). Evaporation depends on temperature, atmospheric pressure, and the kinetic energy of the molecules, not escape velocity. On the Moon, the lack of a significant atmosphere results in minimal pressure, which can actually lead to slower evaporation rates compared to Earth, where H₂O can evaporate more readily due to higher temperatures and atmospheric conditions. Other options are not provided, but any that suggest a direct relationship between escape velocity and evaporation rates would also be incorrect.
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