Practice Quiz

Praxis II General Science

Category - Major Ideas

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Mark has devised a marvelous machine that he calls the MechaMark II. It’s an engine that takes lukewarm pond or river water, converts the heat contained inside into energy, and uses that energy to cook food! This is too good to be true, because of:
  1. The law of conservation of mass.
  2. The 3rd law of thermodynamics.
  3. The 2nd law of thermodynamics.
  4. The 1st law of thermodynamics.
  5. The cyclic engine theory,
Explanation
Answer: B - This is too good to be true because of the 3rd law of thermodynamics, which states that all cycles or processes are in a state of entropy, meaning that high heat can create low heat, but low heat cannot create high heat.
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