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MHT-CET Thermodynamics — practice questions — page 3

Explore 76 free Thermodynamics questions in MHT-CET Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Thermodynamics questions and exercises with answers

Showing questions 61–76 of 76.

At absolute zero, a system is in the state of minimum thermal energy known as itsRead the answer and worked solution →For an isolated system, the first law implies that its total energyRead the answer and worked solution →Natural processes tend toward spatial uniformity of temperature. Which law describes this?Read the answer and worked solution →The zeroth law makes thermal equilibrium a relation of which type?Read the answer and worked solution →Which statement denies the possibility of a perfect refrigerator?Read the answer and worked solution →Which statement rules out a heat engine that converts all absorbed heat into work?Read the answer and worked solution →What limit does the Second Law set on a heat engine's efficiency?Read the answer and worked solution →A book on a desk never hops up by cooling the desk. Which law forbids this?Read the answer and worked solution →Irreversibility comes from non-equilibrium states and which other cause?Read the answer and worked solution →A Carnot engine takes heat from a 800 K source and rejects it at 400 K. What is its efficiency?Read the answer and worked solution →A Carnot engine works between 500 K and 300 K. What fraction of the absorbed heat becomes work?Read the answer and worked solution →An engine absorbs 600 J per cycle and has an efficiency of 0.25. How much work does it do per cycle?Read the answer and worked solution →A Carnot cycle is made of which combination of steps?Read the answer and worked solution →In the isothermal compression of a Carnot cycle, heat is?Read the answer and worked solution →In the Carnot cycle, the heat absorbed during isothermal expansion equals which quantity?Read the answer and worked solution →Stirring a liquid in contact with a reservoir cannot be exactly reversed because that would violate which law?Read the answer and worked solution →

Worked practice questions

At absolute zero, a system is in the state of minimum thermal energy known as its

  1. ground state
  2. triple state
  3. excited state
  4. critical state
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Correct answer: A. ground state

At absolute zero a system sits in its lowest thermal energy state, called the ground state.

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For an isolated system, the first law implies that its total energy

  1. stays constant
  2. always decreases
  3. always increases
  4. becomes zero
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Correct answer: A. stays constant

Energy can change form but cannot be created or destroyed, so an isolated system's total energy is constant.

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Natural processes tend toward spatial uniformity of temperature. Which law describes this?

  1. Third law
  2. Second law
  3. First law
  4. Zeroth law
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Correct answer: B. Second law

The second law expresses the irreversibility of natural processes and their tendency toward spatial homogeneity, especially of temperature.

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