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- 1. Multiple Choice
When air is heated, its density ___________.
increases
decreases
remains the same
- 2. Multiple Choice
The diagram shows a refrigerator. The cooling unit is placed at the top. The cooling unit cools the air near it. What happens to the density of the air as it cools, and how does it move?
The density of air increases. It moves down.
The density of air increases. It moves up.
The density of air decreases. It moves down.
The density of air increases. It moves up.
- 3. Multiple Choice
Convection can take place in ____________.
solids only.
liquids only.
liguids and gases only.
solids, liquids and gases.
- 4. Multiple Choice
Which is the best position to place the heating element in an electric heater?
A
B
C
D
- 5. Multiple Choice
In the process of convection, energy is transferred _________.
because of temperature differences in a solid
because of density differences in a liquid
by the diffusion of molecules throughout a fluid
by the vibration of molecules
- 6. Multiple Choice
Which of the following correctly shows the direction of convection currents in water?
A
B
C
D
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