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 hear energy during falling.

• A. If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
• B. If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.
• C. If Assertion is true but Reason is false.
• D. If both Assertion and Reason are false.

Answer 1

Answer: (A)

When the water is at top of the fall it has potential energy $m g h$ (where $m$ is the mass of the water and $h$ is the height of the fall). On falling, this potential energy is converted into kinetic energy, which further is converted into heat energy and so temperature of water increases.