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6 Basic Thermodynamic Processes Online Quiz Questions

Use this free practice quiz with 20 questions to review 6 Basic Thermodynamic Processes, test your knowledge, and prepare for your next test or exam.

20 questions
01
True or false
1 point

For a quasi-equilibrium process, the area under its path on a pressure–volume diagram represents work done by the system.

  1. A

    True

  2. B

    False

02
Written response
1 point

What is the standard term for work associated with motion of a system boundary?

03
Fill in the blank
1 point

A process at fixed pressure is , while a process at fixed volume is .

04
Choose one
1 point

A rigid, sealed tank receives 240 J240\ \text{J} of heat. The system has negligible kinetic and potential energy changes. What is its change in internal energy?

  1. A

    ΔU=0\Delta U=0

  2. B

    ΔU=240 J\Delta U=240\ \text{J}

  3. C

    ΔU=−240 J\Delta U=-240\ \text{J}

  4. D

    ΔU=480 J\Delta U=480\ \text{J}

05
True or false
1 point

Every adiabatic process is reversible and has constant entropy.

  1. A

    True

  2. B

    False

06
Written response
1 point

A closed system receives 520 J520\ \text{J} of heat and does 170 J170\ \text{J} of work. Using ΔU=Q−W\Delta U=Q-W, what is ΔU\Delta U? Enter the value in joules.

07
Choose one
1 point

For a fixed amount of ideal gas undergoing a constant-pressure process, which relation gives the heat transfer when specific heats are constant?

  1. A

    Q=mcvΔTQ=mc_v\Delta T

  2. B

    Q=0Q=0

  3. C

    Q=mcpΔTQ=mc_p\Delta T

  4. D

    Q=mcpQ=mc_p

08
Choose all
1 point

For a closed system with negligible kinetic and potential energy changes, select all conclusions that follow from ΔU=Q−W\Delta U=Q-W.

  1. A

    If Q=0Q=0, then ΔU=−W\Delta U=-W.

  2. B

    If W=0W=0, then ΔU=Q\Delta U=Q.

  3. C

    If Q>0Q>0 and W>0W>0, then ΔU\Delta U must be positive.

  4. D

    If Q=WQ=W, then ΔU=0\Delta U=0.

09
Fill in the blank
1 point

For an ideal gas with constant specific heats, ΔU=mcvΔT\Delta U=mc_v\Delta T; the subscript vv indicates that the specific heat is measured at volume.

10
Choose all
1 point

For the polytropic model PVn=constantPV^n=\text{constant}, select all statements that correctly describe its special cases or the meaning of nn.

  1. A

    For n=0n=0, the polytropic relation describes a constant-pressure process.

  2. B

    For an ideal gas, n=1n=1 gives an isothermal process.

  3. C

    For an ideal gas with constant specific heats, n=γn=\gamma corresponds to a reversible adiabatic process.

  4. D

    The polytropic exponent is a universal property of the gas, independent of the process path.

11
Choose one
1 point

Under which conditions can an ideal-gas process be described by PVγ=constantPV^{\gamma}=\text{constant}?

  1. A

    Any adiabatic process, including an irreversible one

  2. B

    A reversible or quasi-static adiabatic process of an ideal gas with constant specific heats

  3. C

    Any isothermal process of an ideal gas

  4. D

    A constant-pressure process of an ideal gas

12
Open ended
1 point

A fixed mass of gas follows a quasi-equilibrium polytropic path with n=2n=2, from P1=200 kPaP_1=200\ \text{kPa}, V1=0.10 m3V_1=0.10\ \text{m}^3 to P2=50 kPaP_2=50\ \text{kPa}, V2=0.20 m3V_2=0.20\ \text{m}^3. Calculate the boundary work done by the gas in kilojoules and state what the sign indicates.

13
Choose one
1 point

An ideal gas expands at constant pressure from 0.20 m30.20\ \text{m}^3 to 0.35 m30.35\ \text{m}^3 while its pressure is 150 kPa150\ \text{kPa}. What boundary work does the gas do?

  1. A

    22.5 kJ22.5\ \text{kJ}

  2. B

    52.5 kJ52.5\ \text{kJ}

  3. C

    −22.5 kJ-22.5\ \text{kJ}

  4. D

    0.15 kJ0.15\ \text{kJ}

14
Written response
1 point

A 1 kg1\ \text{kg} ideal gas expands quasi-equilibrially at constant temperature T=300 KT=300\ \text{K}, with specific gas constant R=0.287 kJ/(kg⋅K)R=0.287\ \text{kJ}/(\text{kg}\cdot\text{K}) and volume ratio V2/V1=eV_2/V_1=e. Calculate the work done by the gas. Enter the value in kilojoules.

15
Choose one
1 point

A closed system receives 7070 kJ of heat and does 2525 kJ of work. Using ΔU=Q−W\Delta U=Q-W, what is its change in internal energy?

  1. A

    2020 kJ

  2. B

    4545 kJ

  3. C

    7070 kJ

  4. D

    9595 kJ

16
Choose one
1 point

A gas is heated in a rigid, sealed tank. Which statement describes its boundary work and the relation between heat transfer and internal energy change?

  1. A

    The gas does positive boundary work, and Q>ΔUQ>\Delta U.

  2. B

    The gas does zero boundary work, and Q=0Q=0.

  3. C

    The gas does zero boundary work, and Q=ΔUQ=\Delta U.

  4. D

    The gas does negative boundary work, and Q<ΔUQ<\Delta U.

17
Choose one
1 point

An ideal gas expands at a constant pressure of 150150 kPa from 0.200.20 m3^3 to 0.500.50 m3^3. How much boundary work does it do?

  1. A

    3030 kJ

  2. B

    4545 kJ

  3. C

    7575 kJ

  4. D

    105105 kJ

18
Choose one
1 point

An ideal gas expands while its temperature remains constant. Which statement follows from the first law?

  1. A

    ΔU=0\Delta U=0, so the heat received equals the work done.

  2. B

    Q=0Q=0, so the internal energy change equals the negative of the work.

  3. C

    W=0W=0, so all the heat received raises internal energy.

  4. D

    The internal energy increases because the gas expands.

19
True or false
1 point

True or false: The polytropic exponent nn is a universal property of a gas, independent of the process it follows.

  1. A

    True

  2. B

    False

20
Written response
1 point

What term describes a reversible (or quasi-static) adiabatic process of an ideal gas with constant specific heats?