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PhysicsJEE Main 24 Jan 2026, Shift 1·Q4·MCQ·Moderate

Thermodynamics · Laws of thermodynamics

Density of water at 4∘4^\circC and 20∘20^\circC are 1000 kg/m31000\ \mathrm{kg/m^3} and 998 kg/m3998\ \mathrm{kg/m^3} respectively. The increase in internal energy of 4 kg water when it is heated from 4∘4^\circC to 20∘20^\circC is J.
(Specific heat capacity of water =4.2 kJ kg−1 ∘C−1= 4.2\ \mathrm{kJ\,kg^{-1}\,{}^\circ C^{-1}} and 1 atmospheric pressure =105= 10^{5} Pa)
  1. (1)315826.2
  2. (2)234699.2
  3. (3)258700.8
  4. (4)268799.2
We corrected a printing error in the original paper

Source printed “1000 kg/m3^3 and respectively” and “4.2 J/kg.”; corrected to the intended “1000 kg/m3^3 and 998 kg/m3^3 respectively” and “4.2 kJ kg−1^{-1} ∘^\circC−1^{-1}” (the values the key uses).

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