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JEE Main 2025 Apr 8 Shift 2, Physics Q5: Laws of Thermodynamics

JEE Main2025Apr 8, Shift 2Physics
Q.

Water falls from a height of 200 m into a pool. Calculate the rise in temperature of the water assuming no heat dissipation from the water in the pool.

(Take m/s, specific heat of water J/(kg K))

  1. A

    K

  2. B

    K

  3. C

    K

  4. D

    K

Solution

If all the gravitational potential energy of the falling water converts to internal energy, energy conservation gives .

The mass cancels, leaving .

Substituting: K.

To the given precision, this rounds to K, matching option (4).

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