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Class 11 Physics Practice Test: Thermodynamics - Second Law of Thermodynamics
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The Second Law of Thermodynamics states that heat always moves from hotter objects to colder objects (or "downhill"), unless energy in some form is supplied to reverse the direction of heat flow.

This basically means that any isolated system's entropy always increases. Isolated systems evolve spontaneously towards thermal equilibrium— the system's state of maximum entropy. This also means that Universe entropy (the ultimate isolated system) only increases and never decreases.

Class 11 Physics Practice Test: Thermodynamics - Second Law of Thermodynamics
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5 Questions

1. Which of the following is the Kelvin Planck statement?
2. A process is carried out between 2 systems. It is possible for entropy of one system to decrease. True or False?
3. A process is carried out between 2 systems. It is possible for entropy of one system to decrease. True or False?
4. The second law of thermodynamics states that?
5. Which law of thermodynamics says that efficiency of a heat engine cannot be 1?

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