Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main20253 Apr 2025Morning ShiftPhysicsThermodynamicsActual

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 Q is positive, work done by ice water system is negative Hence by first law of thermodynamics U = Q + W = 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 ) , followed by an isochoric process ( bc ) and an adiabatic process ( ca ) as shown in the figur 2026As shown in the figure, five Carnot engines, each with efficiency and same number of cycles per unit time, are operating between six heat reservoirs. The amount of heat released pe 2026Ten moles of an ideal monoatomic gas, initially in state a at atmospheric pressure and temperature T_a = 27^ C, is enclosed in a metal cylinder of volume V₀ fitted with a frictionl 2026One mole of diatomic gas having rotational modes only is kept in a cylinder with a piston system. The cross-section area of the cylinder is 4 cm ^2 . The gas is heated slowly to ra 2026Initial pressure and volume of a monoatomic ideal gas are P and V . The change in internal energy of this gas in adiabatic expansion to volume V_ final =27V is ________ J. 2026A cylinder with adiabatic walls is closed at both ends and is divided into two compartments by a frictionless adiabatic piston. Ideal gas is filled in both (left and right) the com 2026Two closed vessels of same volume are joined through a narrow tube and both vessels are filled with air of pressure 90 kPa and temperature 400 K. Keeping the temperature of one ves 2026A certain gas is isothermally compressed to ( 1 3 )^ rd of its initial volume ( V_o = 3 litre) by applying required pressure. If the bulk modulus of the gas is 3 10^5 N/m ^2 , the 2026 Full Thermodynamics list All JEE Main PYQs