JEE Main 2021PhysicsWork Power EnergyEasyMCQ

JEE Main 2021 — Work Power Energy Question with Solution

JEE Main 2021 (27 Aug Shift 2)

Question

The height of victoria's falls is 63 m. What is the difference in the temperature of water at the top and at the bottom of the fall? [Given 1 cal=4.2 J and specific heat of water =1 cal g-1 C∘-1

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Show full solutionCorrect option: C
Correct answer
C0.147 °C

Step-by-step explanation

Here use the concept of conservation of energy, here potential energy is converted in to heat energy, ⇒mgh=msΔθ, here m, h & s, is the mass of the liquid, height of the fall, and specific heat capacity then, g×63=Δθ×4.2×103⇒Δθ=0.147°C.

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About this question

This is a previous-year question from JEE Main 2021, covering the Work Power Energy chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.