Question 1

Neither heat nor work are state functions.

Accepted Answer

A) True 
 B)False

Question 2

A reversible engine operating between 500 K and 300 K has the same efficiency as a reversible engine operating between 400 K and what lower temperature?

Accepted Answer

A)  200 K 
B)  220 K 
C)  240 K 
D)  260 K 
E)  280 K 
A)  200 K 
B)  220 K 
C)  240 K 
D)  260 K 
E)  280 K

Question 3

If the efficiency of a reversible engine is 28.%,
(a) what is its COP operated as a refrigerator?
(b) what is its COP operated as a heat pump?

Accepted Answer

The answer of If the efficiency of a reversible engine...

Question 4

When a gas expands adiabatically,

Accepted Answer

A)  the internal energy of the gas decreases. 
B)  the internal energy of the gas increases. 
C)  there is no work done by the gas. 
D)  work is done on the gas. 
E)  heat flows out of the system. 
A)  the internal energy of the gas decreases. 
B)  the internal energy of the gas increases. 
C)  there is no work done by the gas. 
D)  work is done on the gas. 
E)  heat flows out of the system.

Question 5

If a thermometer measures the temperature of two objects as being equal, you can conclude that if the objects are placed in thermal contact, no heat will flow between them.

Accepted Answer

A) True 
 B)False

Question 6

An engine on each cycle takes in 40. Joules, does 10. Joules of work, and expels 30. J of heat. What is its efficiency?

Accepted Answer

The answer of An engine on each cycle takes in...

Question 7

An expandable container holds 2.30 mole of He gas with an initial pressure of 770 kPa and an initial volume of 2.10 L. The gas expands isothermally to a final pressure of 350 kPa. How much heat is gained by the gas in this process?

Accepted Answer

A)  1280 J 
B)  792 J 
C)  685 J 
D)  1370 J 
E)  1700 J 
A)  1280 J 
B)  792 J 
C)  685 J 
D)  1370 J 
E)  1700 J

Question 8

State the First Law of Thermodynamics.

Accepted Answer

If U is the internal energy of

Question 9

State the Second Law of Thermodynamics.

Accepted Answer

When objects of different temperatures a

Question 10

700 J of heat are added to 12 moles of an ideal monatomic gas at constant volume. What is the change in temperature?

Accepted Answer

A)  4.7 K 
B)  5.2 K 
C)  5.8 J 
D)  6.8 K 
E)  9.3 K 
A)  4.7 K 
B)  5.2 K 
C)  5.8 J 
D)  6.8 K 
E)  9.3 K

Question 11

A certain ideal gas has a molar specific heat at constant volume Cv = 7R/5. What is its molar specific heat at constant pressure?

Accepted Answer

A)  12R/5 
B)  7R/3 
C)  12R/7 
D)  12R/5. 
E)  4R 
A)  12R/5 
B)  7R/3 
C)  12R/7 
D)  12R/5. 
E)  4R

Question 12

A gas expands from an initial volume of 0.040 m3 to a final volume of 0.085 m3 while its pressure increases linearly with the volume (so that the process follows a straight-line path in a P-V diagram) from 110 kPa to 225 kPa. How much work is done by the system?

Accepted Answer

A)  5.2 kJ 
B)  7.5 kJ 
C)  7.8 kJ 
D)  11 kJ 
E)  12 kJ 
A)  5.2 kJ 
B)  7.5 kJ 
C)  7.8 kJ 
D)  11 kJ 
E)  12 kJ

Question 13

What is the maximum efficiency of an engine operating between 500 K and 300 K?

Accepted Answer

A)  20% 
B)  30% 
C)  40% 
D)  50% 
E)  60% 
A)  20% 
B)  30% 
C)  40% 
D)  50% 
E)  60%

Question 14

An irreversible engine operating between the temperatures of 550 K and 300 K extracts 1200 J of heat from the hot reservoir and produces 450 J of work. How much entropy is created in the process?

Accepted Answer

A)  0.32 J/K 
B)  0.68 J/K 
C)  0.44 J/K 
D)  0.73 J/K 
E)  0 J/K 
A)  0.32 J/K 
B)  0.68 J/K 
C)  0.44 J/K 
D)  0.73 J/K 
E)  0 J/K

Question 15

A monatomic ideal gas with an initial pressure of 500 kPa and an initial volume of 1.80 L expands isothermally to a final volume of 5.20 L. How much work is done on the gas in this process?

Accepted Answer

A)  955 J 
B)  900 J 
C)  875 J 
D)  1570 J 
E)  1700 J 
A)  955 J 
B)  900 J 
C)  875 J 
D)  1570 J 
E)  1700 J

Question 16

The entropy of the surroundings remains constant during an adiabatic change even if the change is irreversible.

Accepted Answer

A) True 
 B)False

Question 17

A Carnot air conditioner operates between an indoor temperature of 20°C and an outdoor temperature of 39°C. How much energy does it need to remove 2000 J of heat from the interior of the house?

Accepted Answer

A)  105 J 
B)  130 J 
C)  780 J 
D)  520 J 
E)  340 J 
A)  105 J 
B)  130 J 
C)  780 J 
D)  520 J 
E)  340 J

Question 18

The molar specific heat is the amount of heat required to raise the temperature of what amount of matter by one unit of temperature?

Accepted Answer

A)  one tooth 
B)  one unit of mass of a material 
C)  one mole of a substance 
D)  two moles of a substance 
E)  one molecule of a substance 
A)  one tooth 
B)  one unit of mass of a material 
C)  one mole of a substance 
D)  two moles of a substance 
E)  one molecule of a substance

Question 19

State the Zeroth Law of Thermodynamics.

Accepted Answer

When two objects hav

Question 20

A Carnot air conditioner has a coefficient of performance of 17.0 and removes 72.0 MJ of heat from the interior of a house every hour. How much power does it consume?

Accepted Answer

A)  1180 W 
B)  1320 W 
C)  520 kW 
D)  3.14 MW 
E)  1.25 MW 
A)  1180 W 
B)  1320 W 
C)  520 kW 
D)  3.14 MW 
E)  1.25 MW

Exam 18: The Laws of Thermodynamics

Neither heat nor work are state functions.

A reversible engine operating between 500 K and 300 K has the same efficiency as a reversible engine operating between 400 K and what lower temperature?

If the efficiency of a reversible engine is 28.%, (a) what is its COP operated as a refrigerator? (b) what is its COP operated as a heat pump?

When a gas expands adiabatically,

If a thermometer measures the temperature of two objects as being equal, you can conclude that if the objects are placed in thermal contact, no heat will flow between them.

An engine on each cycle takes in 40. Joules, does 10. Joules of work, and expels 30. J of heat. What is its efficiency?

An expandable container holds 2.30 mole of He gas with an initial pressure of 770 kPa and an initial volume of 2.10 L. The gas expands isothermally to a final pressure of 350 kPa. How much heat is gained by the gas in this process?

State the First Law of Thermodynamics.

State the Second Law of Thermodynamics.

700 J of heat are added to 12 moles of an ideal monatomic gas at constant volume. What is the change in temperature?

A certain ideal gas has a molar specific heat at constant volume Cv = 7R/5. What is its molar specific heat at constant pressure?

A gas expands from an initial volume of 0.040 m3 to a final volume of 0.085 m3 while its pressure increases linearly with the volume (so that the process follows a straight-line path in a P-V diagram) from 110 kPa to 225 kPa. How much work is done by the system?

What is the maximum efficiency of an engine operating between 500 K and 300 K?

An irreversible engine operating between the temperatures of 550 K and 300 K extracts 1200 J of heat from the hot reservoir and produces 450 J of work. How much entropy is created in the process?

A monatomic ideal gas with an initial pressure of 500 kPa and an initial volume of 1.80 L expands isothermally to a final volume of 5.20 L. How much work is done on the gas in this process?

The entropy of the surroundings remains constant during an adiabatic change even if the change is irreversible.

A Carnot air conditioner operates between an indoor temperature of 20°C and an outdoor temperature of 39°C. How much energy does it need to remove 2000 J of heat from the interior of the house?

The molar specific heat is the amount of heat required to raise the temperature of what amount of matter by one unit of temperature?

State the Zeroth Law of Thermodynamics.

A Carnot air conditioner has a coefficient of performance of 17.0 and removes 72.0 MJ of heat from the interior of a house every hour. How much power does it consume?

Introduction to Physics

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A certain ideal gas has a molar specific heat at constant volume C_v = 7R/5. What is its molar specific heat at constant pressure?

A gas expands from an initial volume of 0.040 m³ to a final volume of 0.085 m³ while its pressure increases linearly with the volume (so that the process follows a straight-line path in a P-V diagram) from 110 kPa to 225 kPa. How much work is done by the system?