1. An ideal gas undergoes an isothermal expansion from state A to state B. In this process
(a) Q = 0, ∆U = 0, W > 0.
(b) Q > 0, ∆U = 0, W < 0.
(c) Q = 0, ∆U > 0, W > 0.
(d) Q > 0, ∆U = 0, W > 0.
(e) Q = 0, ∆U < 0, W < 0.
2. An ideal gas undergoes an isothermal process. Which of the following statements are true? (i) No heat is added to or removed from the gas. (ii) The internal energy of the gas does not change. (iii) The average kinetic energy of the molecules does not change.
(a) (i) only.
(b) (i) and (ii) only.
(c) (i) and (iii) only.
(d) (ii) and (iii) only.
(e) (i), (ii), and (iii).
(f) None of the above.