Question

The second law of thermodynamics states that?

(a) Entropy of an isolated system can never decrease over time

(b) Entropy of a pure crystalline substance at 0K is 0

(c) Energy is conserved

(d) Entropy of a system can never decrease

The question was posed to me by my school teacher while I was bunking the class.

My question is based upon Second Law of Thermodynamics topic in section Thermodynamics of Physics – Class 11

Answer 1

Correct answer is (a) Entropy of an isolated system can never decrease over time

The explanation: The second law states that entropy of an isolated system can never decrease over time. There can be a system whose entropy decreases, but, at the same time in that process another system’s increase in entropy will more than compensate for that decrease.