Physics · THERMODYNAMICS

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The Zeroth Law of Thermodynamics allows us to introduce the concept of temperature as a measurable physical quantity. Reason (R): The Zeroth Law states that two systems in thermal equilibrium with a third system separately are also in thermal equilibrium with each other. In the light of the above statements, choose the correct answer from the options given below:

1. A
   Both (A) and (R) are true and (R) is the correct explanation of (A).
2. B
   Both (A) and (R) are true but (R) is NOT the correct explanation of (A).
3. C
   (A) is true but (R) is false.
4. D
   (A) is false but (R) is true.