Question

9. Which of the following is not one of the laws of thermodynamics?

• A. 1. The increase in internal energy of a closed system is equal to the difference of the heat supplied to the system and the work done by it
• B. 2. Heat cannot spontaneously flow from a colder location to a hotter location
• C. As a system approaches absolute zero the entropy of the system approaches a minimum value
• D. A perpetual motion machine can be designed by gradually lowering a system from higher temperature to lower temperature

Answer 1

Answer: (D)

A perpetual motion machine is a hypothetical machine that can do work for an infinite time without an external energy supply. This kind of machine is not possible, as it would violate either the first or second law of thermodynamics or both.
Now we can say
The correct option for the above question is

A perpetual motion machine can be designed by gradually lowering a system from higher temperature to lower temperature

Option:(D)