Free Practice Quiz Question List

2 Energy, Heat, and Work Online Quiz Questions

Use this free practice quiz with 20 questions to review 2 Energy, Heat, and Work, test your knowledge, and prepare for your next test or exam.

20 questions

Choose one

1 point

In which direction does heat flow spontaneously?

A
From lower temperature toward higher temperature
B
From higher temperature toward lower temperature
C
Only from a solid to a liquid
D
Only when a system does work

True or false

1 point

True or false: Heat is a property stored in a thermodynamic system.

A
True
B
False

Choose one

1 point

A closed system has relevant internal, kinetic, and gravitational potential energy. Which description best represents its total energy?

A
Only internal energy
B
Only kinetic and potential energy
C
Internal, kinetic, and potential energy, with other relevant forms as needed
D
Heat and work stored inside the system

Choose one

1 point

An electric current carries energy across a system boundary into a device. How should this transfer be classified?

A
Heat, because electrical devices often warm systems
B
Work, because energy crosses through electrical forces and current
C
Heat, because current always requires a temperature difference
D
Neither heat nor work, because electricity is stored energy

Choose one

1 point

A gas expands quasistatically against its surroundings. Using the convention that work done by the system is positive, what is the sign of its boundary work?

A
Positive, because the system expands
B
Negative, because the system expands
C
Zero, because the pressure acts at the boundary
D
It cannot be determined from the direction of volume change

Choose all

1 point

Select all the examples that describe work transferring energy across a system boundary.

A
A rotating shaft turns a turbine
B
An electric current crosses into a motor
C
Thermal energy passes through a wall by conduction
D
A moving force stretches a spring

True or false

1 point

True or false: In an open system, energy can enter or leave with matter flowing across the system boundary.

A
True
B
False

Choose all

1 point

Select all the statements consistent with the convention that heat into the system and work done by the system are positive.

A
Heat entering the system has positive Q
B
Heat leaving the system has negative Q
C
Work done on the system has positive W
D
Work done by the system has positive W

Written response

1 point

A closed system absorbs $25\,\text{J}$ of heat and does $10\,\text{J}$ of work. Using $\Delta E=Q-W$ , what is its change in total energy?

Written response

1 point

For a closed system, what first-law equation applies when heat into the system and work done by the system are both defined as positive?

Fill in the blank

1 point

Energy transferred across a system boundary because of a temperature difference is .

Fill in the blank

1 point

For quasistatic boundary work, $W_{\text{by}}=\int_{V_1}^{V_2}$ $\,dV$ . What symbol completes the integrand?

Open ended

1 point

Explain the difference between internal energy and total energy for a closed system. When can the change in total energy be approximated by the change in internal energy?

Choose one

1 point

Which description defines heat in thermodynamics?

A
Energy stored in a system because its particles are moving
B
Energy transferred across a boundary because of a temperature difference
C
Energy transferred only by a moving piston
D
Energy carried only by matter entering an open system

Choose one

1 point

Which equation gives a useful accounting of the total energy of a closed system?

A
$E=Q-W$
B
$E=U-Q+W$
C
$E=U+KE+PE$
D
$E=Q+W$

Choose one

1 point

A force stretches a spring attached to a system, transferring energy across its boundary. How should this transfer be classified?

A
Heat, because any energy transfer that changes a system's temperature is heat
B
Shaft work, because all mechanical interactions involve rotation
C
Electrical work, because the force acts across a boundary
D
Other mechanical work, because a moving force transfers energy through the boundary

Choose one

1 point

An electric current crosses a system boundary and later raises the system's temperature. How is the energy transfer classified as it crosses the boundary?

A
Electrical work, because the energy crosses through electrical forces and current
B
Heat, because the system eventually becomes warmer
C
Boundary work, because all energy transfers change the system's energy
D
Energy carried by matter, because electrical current must cross the boundary

True or false

1 point

True or false: Defining work as positive when done on a system can produce an energy-balance equation equivalent to one that defines work as positive when done by the system, provided the convention is used consistently.

A
True
B
False

Written response

1 point

What work mode transfers energy through torque and rotation in a device such as a turbine?

Written response

1 point

A gas expands at a constant pressure of $200\,\text{kPa}$ , increasing its volume by $0.003\,\text{m}^3$ . Using $W_{\text{by}}=p\Delta V$ , what work is done by the gas? Enter the value in joules.