Thermodynamics quiz
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Which kitchen appliance works as a heat pump?
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More questions about Thermodynamics
These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.
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Which law says energy can't be created or destroyed?
Answer: First law
Why: In symbols the first law reads $\Delta U = Q - W$: internal energy changes by the heat added minus the work done.
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About what share of a petrol car's fuel energy moves it along?
Answer: About 20%
Why: Most of the fuel's energy never reaches the wheels: around 70% is lost in the engine, mainly as heat.
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Which rule sets the minimum heat released when a bit is erased?
Answer: Landauer's principle
Why: At room temperature the minimum is tiny: about 3 × 10⁻²¹ joules for each bit erased.
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What scenario leaves the universe at maximum entropy?
Answer: Heat death
Why: Despite the name, it has nothing to do with high heat: no temperature differences remain, so no work can be done.
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Why does air cool as it rises?
Answer: Expansion
Why: With no heat leaving it, rising dry air cools about 9.8 °C per kilometer just by expanding, which is called adiabatic cooling.
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What kinds of steps make up a Carnot cycle?
Answer: Isothermal and adiabatic
Why: Heat enters only at the hot temperature and leaves only at the cold one, giving the highest possible efficiency, $1 - T_c/T_h$.
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