The GATE Grind

GATE 2016 ME (ME2) – Question 27

Thermodynamics · Ideal and real gases · 1 mark · Multiple choice

The internal energy of an ideal gas is a function of

  1. temperature and pressure
  2. volume and pressure
  3. entropy and pressure
  4. temperature only

Practise this question in The GATE Grind →

Show answer and explanation

Correct answer: (D) temperature only

Explanation

For a fixed-composition ideal gas, internal energy depends on temperature alone: du=cv(T)dT. Pressure and volume can change at constant temperature without changing u. Therefore **temperature only, D**. This is a caloric property of the ideal-gas model.