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CBSE Class 11 (Science) Thermal Properties of Matter & Thermodynamics — practice questions — page 3

Explore 267 free Thermal Properties of Matter & Thermodynamics questions in CBSE Class 11 (Science) Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Thermal Properties of Matter & Thermodynamics questions and exercises with answers

Showing questions 61–90 of 267.

A gas in equilibrium is split into two equal halves. Which quantity is halved in each part?Read the answer and worked solution →Why can a gas during sudden free expansion into vacuum not be described by state variables?Read the answer and worked solution →A quasi-static process is one that isRead the answer and worked solution →In a quasi-static process, the system and surroundings differ in pressure byRead the answer and worked solution →A process in which the volume is kept constant is calledRead the answer and worked solution →An ideal gas expands isothermally and absorbs 600 J of heat. The work done by the gas isRead the answer and worked solution →During isothermal compression of an ideal gas, the gasRead the answer and worked solution →For an adiabatic change of an ideal gas, which quantity stays constant?Read the answer and worked solution →In the adiabatic relation PV^γ = constant, γ stands forRead the answer and worked solution →An insulated gas does 150 J of work on a piston. The change in its internal energy isRead the answer and worked solution →One mole of ideal gas with γ = 1.4 cools by 20 K in adiabatic expansion. With R = 8.3 J mol^-1 K^-1, the work done isRead the answer and worked solution →A gas in a rigid sealed tank absorbs 250 J of heat. The work done by the gas isRead the answer and worked solution →In an isobaric process of an ideal gas, the heat absorbed goes intoRead the answer and worked solution →A gas completes a cycle and absorbs a net 80 J of heat. The net work done by it isRead the answer and worked solution →'No process can have the sole result of turning heat from a reservoir fully into work' is theRead the answer and worked solution →The Clausius statement rules out a process whose only result isRead the answer and worked solution →By the second law, the coefficient of performance of a refrigerator can never beRead the answer and worked solution →The second law of thermodynamics says the efficiency of a heat engine can never beRead the answer and worked solution →Most spontaneous processes in nature areRead the answer and worked solution →Which is a main cause of irreversibility in real processes?Read the answer and worked solution →Which of these processes is reversible?Read the answer and worked solution →The French engineer who first studied the maximum efficiency of a heat engine in 1824 wasRead the answer and worked solution →The Carnot cycle consists ofRead the answer and worked solution →A Carnot engine has its source at 127 °C and sink at 27 °C. Its efficiency isRead the answer and worked solution →A Carnot engine with sink at 300 K has 50% efficiency. Its source temperature isRead the answer and worked solution →The efficiency of a Carnot engine depends on theRead the answer and worked solution →When every step of a Carnot cycle is run backwards, the device acts as aRead the answer and worked solution →Carnot's theorem states that between two given temperatures no engine is more efficient thanRead the answer and worked solution →As temperature approaches absolute zero, the entropy of a system approachesRead the answer and worked solution →The constant entropy a system keeps at absolute zero is called itsRead the answer and worked solution →

Worked practice questions

A gas in equilibrium is split into two equal halves. Which quantity is halved in each part?

  1. Mass density
  2. Temperature
  3. Gas pressure
  4. Internal energy
Show answer and solution

Correct answer: D. Internal energy

Internal energy is extensive, so each half has half the original value, while P, T and density stay the same.

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Why can a gas during sudden free expansion into vacuum not be described by state variables?

  1. Its mass changes
  2. It does no work
  3. It lacks equilibrium
  4. Its volume is fixed
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Correct answer: C. It lacks equilibrium

During rapid free expansion the pressure is not uniform, so the gas is not in an equilibrium state.

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A quasi-static process is one that is

  1. always cyclic
  2. always adiabatic
  3. infinitely slow
  4. extremely rapid
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Correct answer: C. infinitely slow

A quasi-static process is infinitely slow so the system stays in equilibrium with its surroundings at every stage.

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