AnswersPhysics IHeat Transfer

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1
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Thermal energy from the Sun travels to Earth by

A
conduction.
B
convection currents.
C
electromagnetic waves.
D
charged molecules.
2
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Which is an example of radiation?

A
An ice pack is placed on a knee, and the knee cools down.
B
A rock is warmed by an ultraviolet heat lamp.
C
Cold salt water sinks to the bottom of the ocean.
D
Hot coffee in a mug causes the mug to warm up.
3

Which two conditions must exist in order for radiation to occur?

A
the presence of electromagnetic waves and direct contact of molecules
B
the presence of a solid, liquid, or gas and a temperature difference
C
a temperature difference and the presence of electromagnetic waves
D
direct contact of molecules and the presence of a solid, liquid, or gas
4

Substance X is placed in a container with substance Y. Both substances are fluids. Substance X initially sinks to the bottom of the container. After five minutes of being heated on a hot plate, substance X becomes less dense than substance Y. What will most likely happen next?

A
Substance Y will rise due to radiation.
B
Substance Y will rise due to convection.
C
Substance X will rise due to radiation.
D
Substance X will rise due to convection.
5

Substance X is placed in a container with substance Y. Both substances are fluids. Substance X initially sinks to the bottom of the container. After five minutes of being heated on a hot plate, substance X becomes less dense than substance Y. What will most likely happen next?

A
Substance Y will rise due to convection.
B
Substance X will rise due to radiation.
C
Substance Y will rise due to radiation.
D
Substance X will rise due to convection.
6

Which two conditions must exist in order for radiation to occur?

A
the presence of electromagnetic waves and direct contact of molecules
B
the presence of a solid, liquid, or gas and a temperature difference
C
direct contact of molecules and the presence of a solid, liquid, or gas
D
a temperature difference and the presence of electromagnetic waves
7

Which is an example of convection?

A
On a hot day, Amaya pours water on her face to cool off.
B
Above the sea, warm air rises, cools, and sinks.
C
In a mountain forest, the sun heats up the ground.
D
At the beach, Stephan’s feet get hot walking across the sand.
8

Which best describes a wave?

A
a disturbance that carries energy
B
a movement of fluids
C
a collision of particles
D
a group of electrically charged molecules
9

Which is an example of convection?

A
At the beach, Stephan’s feet get hot walking across the sand.
B
On a hot day, Amaya pours water on her face to cool off.
C
Above the sea, warm air rises, cools, and sinks.
D
In a mountain forest, the sun heats up the ground.
10

Convection can occur in which two substances?

A
water and ice
B
wood and air
C
ice and wood
D
air and water

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