# Unit 6 Concepts Quiz

11 Questions | Total Attempts: 254  Settings  Related Topics
• 1.
In an isothermal process, there is no change in
• A.

Pressure

• B.

Temperature

• C.

Volume

• D.

Heat

• 2.
A gas is expanded to twice its original volume with no change in its temperature.  This process is ...
• A.

Isothermal

• B.

Isobaric

• C.

• D.

Isovolumetric

• 3.
An ideal gas is compressed to one-half its original volume during an isothermal process.  The final pressure of the gas
• A.

Increases to twice its original value

• B.

Increases to less than twice its originial value

• C.

Increases to more than twice its original value

• D.

Does not change

• 4.
• A.

ΔU = 0

• B.

W = 0

• C.

Q = 0

• D.

None of the above

• 5.
When the first law of thermodynamics, Q = ΔU + W, is applied to an ideal gas that is taken through an isovolumetric process
• A.

ΔU = 0

• B.

W = 0

• C.

Q = 0

• D.

None of the above

• 6.
Is it possible to transfer heat from a cold reservoir to a hot reservoir?
• A.

No

• B.

Yes; this will happen naturally

• C.

Yes, but work will have to be done.

• D.

Theoretically yes, but it hasn't been accomplished yet.

• 7.
The efficiency of a heat engine is defined as the ratio of
• A.

The heat input at the high temperature to the heat output at the low temperature

• B.

The heat output at the low temperature to the heat input at the high temperature

• C.

The work it does to the heat input at the high temperature

• D.

The work it does to the heat output at the low temperature

• 8.
A Carnot cycle consists of
• A.

• B.

Two isobars and two isotherms

• C.

Two isotherms and two isomets

• D.

• 9.
During an isothermal process, 5.0 J of heat is removed from an ideal gas.  What is the change in internal energy?
• A.

Zero

• B.

2.5 J

• C.

5.0 J

• D.

10 J

• 10.
200 J of work is done in compressing a gas adiabatically.  What is the change in internal energy of the gas?
• A.

Zero

• B.

100

• C.

200

• D.

There is not enough information

• 11.
A heat engine has an efficiency of 35.0% and receives 150 J of heat per cycle.  How much work does it perform in each cycle?
• A.

Zero

• B.

52.5 J

• C.

97.5 J

• D.

150 J