AIIMS 2019 Physics Energy Conversion MCQ Question
Assertion : Water at the foot of the water fall is always at different temperature from that at the top.
Reason : The potential energy of water at the top is converted into heat energy during falling.
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
When water (H₂O) is at the top of a fall, it possesses gravitational potential energy (PE = mgh), which is converted into kinetic energy (KE) as it descends. Upon impact or during turbulent flow, this kinetic energy is transformed into thermal energy, causing an increase in the temperature of the water due to friction and other dissipative forces. Option B is incorrect because it contradicts the principles of energy conservation, while options C and D are irrelevant as the scenario clearly supports the conversion of energy types.
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