Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main 20253 AprilMorning Shift
Exam
JEE Main
Year
2025
Date
3 April
Shift
Morning Shift
Subject
Physics
Chapter
Thermodynamics

JEE Main 2025 · 3 April · Morning Shift · Physics · Thermodynamics

During the melting of a slab of ice at 273 K at atmospheric...

During the melting of a slab of ice at 273 K at atmospheric pressure :

Options

  1. AInternal energy of ice-water system remains unchanged.
  2. BPositive work is done by the ice-water system on the atmosphere.
  3. CInternal energy of the ice-water system decreases.
  4. DPositive work is done on the ice-water system by the atmosphere.

Correct answer

D. Positive work is done on the ice-water system by the atmosphere.

Step-by-step solution

Volume decreases during melting of ice so positive work is done on ice water system by atmosphere
Heat absorbed by ice water so Δ\DeltaQ\mathrm{Q}ispositive,workdonebyicewatersystemisnegative<br/>Hencebyfirstlawofthermodynamics<br/>is positive, work done by ice water system is negative<br/>Hence by first law of thermodynamics<br/>\Delta U=\mathrm{U}=\Delta Q+\mathrm{Q}+\Delta W=\mathrm{W}= Positive \text{ Positive }
So internal energy increases
Practice Thermodynamics on Quantrex Academy →

More from Thermodynamics

A quasi-static cycle of a monoatomic ideal gas contains an isothermal process ( ab )… JEE Advanced 2026As shown in the figure, five Carnot engines, each with efficiency η and same number of… JEE Advanced 2026Ten moles of an ideal monoatomic gas, initially in state a at atmospheric pressure and… JEE Advanced 2026One mole of diatomic gas having rotational modes only is kept in a cylinder with a piston… JEE Main 2026Initial pressure and volume of a monoatomic ideal gas are P and V . The change in… JEE Main 2026A cylinder with adiabatic walls is closed at both ends and is divided into two… JEE Main 2026Two closed vessels of same volume are joined through a narrow tube and both vessels are… JEE Main 2026A certain gas is isothermally compressed to ((1)/(3))^ rd of its initial volume ( V_o = 3… JEE Main 2026 Full Thermodynamics list All JEE Main PYQs