Analyze the two statements below. (A) When heat is supplied to a system, its temperature must rise. (B) When a system does positive work during a thermodynamic process, its volume must increase.

Step-by-step solution

Statement (A) is false because during an isothermal process or a phase change (such as melting or boiling), heat is supplied to the system but its temperature remains constant. Statement (B) is true because the work done by a thermodynamic system is given by W = P dV . Since absolute pressure P is always positive, positive work ( W > 0 ) implies that the change in volume dV must be positive, meaning the volume must increase. Hence, B is true but A is false.