Question:
“It is impossible for a heat engine to be 100% efficient.” This statement is related to:
“It is impossible for a heat engine to be 100% efficient.” This statement is related to:
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The Second Law of Thermodynamics limits the efficiency of all heat engines — always link efficiency-related impossibilities to this law, not the first law or enthalpy.
Updated On: June 02, 2025
- First law of thermodynamics
- Second law of thermodynamics
- Enthalpy
- Diffusion
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The Correct Option is B
Solution and Explanation
Step 1: The statement refers to the efficiency of a heat engine, which is fundamentally limited by the laws of thermodynamics.
Step 2: The Second Law of Thermodynamics states that it is impossible for any heat engine to convert all the heat it absorbs into work — some energy must always be lost to a sink. This implies no engine can be 100% efficient.
Step 3: The First Law of Thermodynamics only deals with conservation of energy and doesn't restrict efficiency. Concepts like enthalpy and diffusion are unrelated to the maximum efficiency of heat engines.
Conclusion: The impossibility of 100% efficiency directly follows from the Second Law of Thermodynamics.
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