Question

Zeroth law of thermodynamics is concerned with

• A. Thermal conductivity
• B. Thermal diffusivity
• C. Thermal resistivity
• D. Thermal equilibrium

Hint:

Zeroth law of thermodynamics is the basis of temperature measurement and thermal equilibrium.

Answer 1

The Correct Option is D

Concept:
The zeroth law of thermodynamics gives the basic idea of temperature measurement and thermal equilibrium.

Step 1: The zeroth law states that if two bodies are separately in thermal equilibrium with a third body, then they are also in thermal equilibrium with each other.

Step 2: Thermal equilibrium means there is no net heat flow between bodies.

Step 3: This happens when the bodies have the same temperature.

Step 4: The law is important because it allows temperature to be used as a measurable property.

Step 5: Therefore, the zeroth law of thermodynamics is concerned with thermal equilibrium. \[ \boxed{\text{Thermal equilibrium}} \]