Consider the following statements:
A. Zeroth law of thermodynamics gives concept of temperature
B. First law of thermodynamics gives concept of internal energy
C. In isothermal expansion of ideal gas, $\Delta Q \ne \Delta W$
D. Product of intensive and extensive variables is extensive
E. The ratio of any extensive variable to mass will be an extensive variable
Choose the correct combination of statements from the options given below:
Answer: (C) A, B and D Only
- A: true, thermal equilibrium defines temperature.
- B: true, the first law introduces internal energy as a state function.
- C: false. In an isothermal process $\Delta U = 0$, so $\Delta Q = \Delta W$.
- D: true. For example, pressure × volume scales with the size of the system.
- E: false. Extensive ÷ mass (e.g. specific heat, specific volume) is intensive.
Correct: A, B and D.
Solution by Sreeraj P, M.Sc Physics