WorksheetsConvection
Total questions: 15
Worksheet time: 8mins
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.
Convection can take place in ____________.
solids only.
liquids only.
liguids and gases only.
solids, liquids and gases.
Which of the following is an application of convection?
The movement of heat through a metal pan to the food.
The use of ice box to keep drinks cool.
The sea breeze that blows from sea to land.
The use of wool blanket to keep the body warm.
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
Which of the following correctly shows the direction of convection currents in water?
A
B
C
D
What is convection ? (Choose all answers that apply)
method of transfer of heat in fluids
method of transfer of heat in solids
transfer of heat due to movement of molecules
transfer of heat due to vibration of molecules
Is sea breeze an example of convection currents ?
Yes
No
Don't know
What does heat do when convection currents are moving?
Sinks
Rises
Stays in place
When do particles move faster?
In hot water
In cold water
What is an example of a convection current?
Touching a hot spoon that was in a soup bowl.
Feeling the suns rays on a nice summer day.
Touching an iron skillet after cooking and feeling the heat.
Movement of gas in a hot air balloon.
True or False
Convection currents is a type of heat transfer that can be felt though empty space.
True
False
Which is an example of convection?
Touching a hot pot
Gases rising and falling in the atmosphere
Cooking a burger
