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RRB Junior Engineer / DMS / CMA 2019 · Question 3496 of 3719

The internal energy of a perfect gas depends on

  1. ATemperature, entropy and specific heats
  2. BTemperature onlyCorrect
  3. CTemperature, pressure and specific heats
  4. DTemperature, enthalpy and specific heats

Answer: B. Temperature only

Explanation

Explanation: If ε represents the energy of one molecule, then ε = ε trans + ε rot + ε vib + ε chem + ε nuclear If N is the number of molecules in the system, then the total internal energy is U = Nε For an ideal gas or perfect gas, there are no intermolecular forces of attraction and repulsion, and the internal energy depends only on temperature. Thus, for an ideal gas U = f(T) only.

Source: RRB JE 2019 (CBT 2) (ME) Previous Year Paper (31 Aug 2019) — prepp.in solved-paper PDF (answer key with explanations) · reliable-secondary

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