Question

Which law of thermodynamics states that "energy of an isolated system is constant"?

• A. First
• B. Second
• C. Third
• D. Zeroth

Hint:

The First Law of Thermodynamics = Law of Energy Conservation. Remember, it applies specifically to isolated systems where no mass or energy is exchanged with the surroundings.

Answer 1

The Correct Option is A

Step 1: Understand the laws of thermodynamics.
First Law of Thermodynamics: Also known as the Law of Conservation of Energy. It states that the total energy of an isolated system remains constant—it can neither be created nor destroyed but can change from one form to another.
Second Law deals with entropy.
Third Law relates to entropy at absolute zero temperature.
Zeroth Law is about thermal equilibrium.
Step 2: Apply the concept.
The statement "energy of an isolated system is constant" clearly refers to the First Law of Thermodynamics.