AnswersPhysicsThermodynamics

Thermodynamics — Test Answers

25 verified answers
1
Free Preview

Which label belongs on the arrow?

A
Cooler water sinks
B
Warmer water sinks
C
Warmer water rises
D
Cooler water rises
2
Free Preview

How would the system change if the container were placed on a hot plate?

A
The kinetic energy of the molecules would increase.
B
Some kinetic energy would be produced.
C
Some kinetic energy would be destroyed.
D
The kinetic energy of the molecules would decrease.
3

Which best describes how the diagram illustrates both laws of thermodynamics?

A
First law: High-temperature steam flows to an area of lower temperature in the turbines. Second law: Thermal energy is used to do work on the turbines.
B
First law: Kinetic energy is used to turn an electrical generator. Second law: Some thermal energy is lost to the surrounding environment as it travels through the system.
C
First law: Some thermal energy is lost to the surrounding environment as it travels through the system. Second law: Kinetic energy is used to turn an electrical generator.
D
First law: Thermal energy is used to do work on the turbines. Second law: High-temperature steam flows to an area of lower temperatures in the turbines.
4

Which will best complete the diagram to illustrate the law?

A
adding in the boxes an arrow that points in both directions between cap q sub h and cap q sub c
B
adding in the boxes an arrow that points from cap q sub h to cap q sub c
C
adding in the boxes an arrow that points from cap q sub c to cap q sub h
D
adding in each box an arrow that points upward from cap q sub h and from cap q sub c
5

Which change would correct the error in his chart?

A
Add “potential energy” to the description of temperature.
B
Switch the term “heat” with the term “thermal energy.”
C
Replace the term “temperature” with “internal energy.”
D
Change kinetic energy description from “energy of motion” to “stored energy.”
6

Which best describes Sienna’s error?

A
The descriptions for intake and ignition should be switched with one another.
B
During compression, temperature does not increase, it decreases.
C
The piston moves down, not up, during the exhaust step.
D
Compression happens before ignition, so it should be step 2.
7

Which best explains Alex’s error?

A
The image does not show thermal energy being transferred because the molecules of two substances or objects are not in direct contact.
B
Thermal energy is being transferred from the person’s hands to the flames.
C
Thermal energy is being transferred from the surrounding air to the flames.
D
The image does not show conduction because the molecules of two substances or objects are not in direct contact.
8

Which shows the order in which thermal energy is transferred by conduction?

A
stove burner right arrow pan right arrow bottom of pan handle right arrow top of pan handle
B
pan right arrow stove burner right arrow bottom of pan handle right arrow top of pan handle
C
top of pan handle right arrow bottom of pan handle to stove burner right arrow pan
D
top of pan handle right arrow bottom of pan handle right arrow pan right arrow stove burner
9

Which label belongs in the area marked Y?

A
Must involve temperature differences between substances or objects
B
Involves the movement of fluids based on density differences
C
Can occur where there is little or no matter
D
Occurs when molecules are in direct contact
10

Which best summarizes what happens to the system after heat is added?

A
Kinetic energy within the system decreases and creates mechanical energy as the piston moves upward.
B
Mechanical energy within the system increases and is transformed into kinetic energy as the piston moves upward.
C
Mechanical energy within the system decreases and creates kinetic energy as the piston moves upward.
D
Kinetic energy within the system increases and is transformed into mechanical energy as the piston moves upward.
11

The first law of thermodynamics states that heat added to a system is neither created nor destroyed but is [Dropdown 1] as it changes into other forms of energy.

Answer:

transformed

12

Which best describes a spontaneous process as it relates to the second law of thermodynamics?

A
It requires work.
B
It destroys heat.
C
It occurs naturally.
D
It creates energy.
13

Which best describes the first law of thermodynamics as compared to the second law of thermodynamics?

A
The first law describes how thermal energy can be created but not how it can be destroyed.
B
The first law describes the direction thermal energy moves but not how it is conserved.
C
The first law describes how thermal energy can be destroyed but not how it can be created.
D
The first law describes how thermal energy is conserved but not the direction it moves.
14

Elements with low specific heat values have which characteristic?

A
high thermal energy
B
low atomic mass
C
low number of atoms per gram
D
low kinetic energy
15

The law of conservation of energy states that energy cannot be [Dropdown 1] or destroyed.

Answer:

created

16

Which best compares kinetic energy and temperature?

A
Kinetic energy is energy of motion, while temperature is a measure of that energy in substances.
B
Temperature is energy of motion, while kinetic energy is a measure of that energy in substances.
C
Temperature is internal transferable energy, while kinetic energy is a measure of that energy in substances.
D
Kinetic energy is internal transferable energy, while temperature is a measure of that energy in substances.
17

Dante pours hot tea into a mug that is cool to the touch. Which best explains what will happen now?

A
The tea will get cooler because it gains energy from the mug.
B
The tea will get warmer because the mug acts as a thermal insulator.
C
The mug will get warmer because thermal energy transfers from the tea to the mug.
D
The mug will get warmer because the tea creates more thermal energy inside the mug.
18

Zoe finds that the temperature of a substance is 12 degrees Celsius. What does this tell Zoe about the substance?

A
It has a specific heat of 12 on the Celsius scale.
B
It has a potential energy of 12 degrees Celsius.
C
Its average kinetic energy is 12 on the Celsius scale.
D
Its internal energy is less than 12 degrees Celsius.
19

Temperature is a measure of the average [Dropdown 1] energy of particles in a substance.

Answer:

kinetic

20

Suppose the exhaust system on a heat engine is not functioning properly. Which statement best explains how this will affect the engine?

A
Burned gases will not be released into the surrounding air.
B
Combustion and subsequent gas expansion will not occur.
C
The temperature of the gas will not increase during the compression stage.
D
The fuel-air mixture will not be able to enter the cylinder.

Did you find these answers helpful?

More from this Course

Quiz
25 verified answers

Test

Quiz
25 verified answers

Test

Quiz
24 verified answers

Test

Thermodynamics — Test Answers — Physics