Exam on Heat and Energy
True/False
Indicate whether the statement is true or false.
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1. Energy is the ability to cause change.
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2. Energy is measured in joules.
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3. When you ride a playground swing, your potential energy is greatest at the highest point.
____
4. Chemical energy travels from the Sun to Earth and is transformed into light energy by plants.
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5. Carbohydrates and fats provide our bodies with energy in the form of calories.
____
6. Radiation is the transfer of energy in the form of particles.
____
7. In a forced-air heating system, the warm air circulates by convection.
Multiple Choice
Identify the choice that best completes the statement or answers the question.
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8. Thermal energy is measured in ____.
a. joules
c. ºC
b. N
d. j/kg
9. The ____ energy of an object increases with its height.
a. chemical
c. thermal
b. kinetic
d. potential
10. The kinetic energy of an object increases as its ____ increases.
a. height above Earth
c. potential energy
b. speed
d. volume
11. Green plants convert light energy from the sun into ____.
a. gravitational potential energy
c. thermal energy
b. chemical potential energy
d. mechanical energy
12. The law of ____ states that energy in a system can change forms but can never be created or destroyed.
a. conversion of energy
c. conservation of energy
b. consecration of energy
d. construction of energy
13. Wind and ocean currents are formed by ____.
a. radiation
c. conduction
b. convection
d. condensation
14. A material that reduces the flow of heat by conduction, convection, and radiation is a(n) ____.
a. conductor
c. solar collector
b. insulator
d. radiator
15. All of the following are good conductors of heat EXCEPT ____.
a. silver
c. aluminum
b. copper
d. air
16. Through which of the following will convection most likely occur?
a. solids and liquids
c. solids
b. solids and gases
d. liquids and gases
17. The transfer of energy that does not require matter is ____.
a. combustion
c. convection
b. conduction
d. radiation
____ 18. Energy from the sun travels to Earth as ____.
a. mechanical energy
c. radiant energy
b. chemical energy
d. combustion
____ 19. Temperature measures the ____ of the particles of a material.
a. heat
c. potential energy
b. kinetic energy
d. kinetic and potential energy
Applying Concepts
Use the figure below to answer the question(s) below.
____ 20. How will the heat from the pot in room A move to its handle?
a. convection
c. conduction
b. radiation
d. both a and b
____ 21. Thermal energy is transferred to the sunbather in room B by ____.
a. convection
c. conduction
b. radiation
d. both a and b
____ 22. Where does most of the heat provided by the fire in room C go?
a. up the chimney
c. to the people
b. into the room
d. none of these
____ 23. In room C, thermal energy is transferred to the people by ____.
a. convection
c. radiation
b. conduction
d. both a and c
____ 24. In room D, the thermal energy of the iron is transferred to the clothes by ____.
a. convection
c. radiation
b. conduction
d. none of these
____ 25. The SI unit for energy is the ____.
a. calorie
c. meter per second
b. joule
d. kilogram
____ 26. According to the law of conservation of energy, the total amount of energy in the universe ____.
a. remains constant
c. increases
b. changes constantly
d. decreases
____ 27. A material that reduces the flow of heat by conduction, convection, and radiation is ____.
a. a conductor
c. an insulator
b. condensation
d. a solar collector
____ 28. All of the following are good conductors of heat EXCEPT ____.
a. air
c. copper
b. aluminum
d. silver
____ 29. Energy from the Sun travels to Earth as ____.
a. chemical energy
c. radiant energy
b. combustion
d. mechanical energy
____ 30. One reason alternative energy sources are needed is because ____.
a. the energy needs of the world are decreasing
b. there is no limit to the supply of fossil fuels
c. the population of the world is decreasing
d. the supply of fossil fuel is diminishing
Short Answer
31. When coasting while roller skating, you eventually stop. Why?
32. On a hot day, which would stay cool longer, a sheet of aluminum (specific heat 920 J/kg K) or copper
(specific heat 380 J/kg K)? Why?
Exam on Heat and Energy
Answer Section
TRUE/FALSE
1. ANS:
STA:
2. ANS:
STA:
3. ANS:
STA:
4. ANS:
STA:
5. ANS:
STA:
6. ANS:
STA:
7. ANS:
STA:
T
PTS: 1
DIF:
S8P2
T
PTS: 1
DIF:
S8P2c
T
PTS: 1
DIF:
S8P2b
F
PTS: 1
DIF:
S6E6a | S7L4b | S8P2 | S8P2c | S8P2d
T
PTS: 1
DIF:
S7L4a | S8P2 | S8P2c
F
PTS: 1
DIF:
S8P2d
T
PTS: 1
DIF:
S8P2d
B
OBJ: 1/1
B
OBJ: 1/1
B
OBJ: 7/2
B
OBJ: 7/2
A
OBJ: 2/1
B
OBJ: 5/2
B
OBJ: 8/3
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
DIF: B
OBJ: 1/1
1
DIF: B
OBJ: 7/2
1
DIF: B
OBJ: 5/2
1
DIF: B
OBJ: 5/2
MULTIPLE CHOICE
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
STA:
26. ANS:
STA:
27. ANS:
STA:
28. ANS:
STA:
A
PTS:
D
PTS:
B
PTS:
B
PTS:
C
PTS:
B
PTS:
B
PTS:
D
PTS:
D
PTS:
D
PTS:
C
PTS:
B
PTS:
C
PTS:
D
PTS:
A
PTS:
D
PTS:
B
PTS:
B
PTS:
S6CS3b | S8P2c
A
PTS:
S8P2a
C
PTS:
S8P2d
A
PTS:
S8P2d
29. ANS:
STA:
30. ANS:
STA:
C
PTS: 1
S8P2d
D
PTS: 1
S6E6 | S6E6b
DIF: B
OBJ: 5/2
DIF: B
OBJ: 7/3
SHORT ANSWER
31. ANS:
Friction causes the kinetic energy to transfer to thermal energy.
PTS: 1
DIF: B
OBJ: 5/2
STA: S8P2 | S8P2c
32. ANS:
Aluminum, because it will take longer for the aluminum to get hot because it has a higher specific heat.
PTS: 1
DIF: A
OBJ: 3/1
STA: S8P1d | S8P2d