Question

Second law introduces the concept of:

• A. Heat
• B. Energy
• C. Entropy
• D. Volume

Hint:

The second law of thermodynamics introduces entropy — a key concept for understanding the direction and irreversibility of processes.

Answer 1

The Correct Option is C

The Second Law of Thermodynamics introduces the concept of entropy, which is a measure of the disorder or randomness in a system.
It provides a direction to thermodynamic processes and explains why certain processes are irreversible.
According to the second law:
- In any energy exchange, if no energy enters or leaves the system, the potential energy of the state will always be less than that of the initial state — also interpreted as an increase in entropy.
- Entropy increases in spontaneous processes and remains constant in ideal reversible processes.
Incorrect options:
- (1) Heat is introduced in the First Law as a form of energy transfer.
- (2) Energy conservation is the focus of the First Law.
- (4) Volume is a state property but not a direct outcome of the second law.