AnswersNC-Physical ScienceConvection

Convection Answers

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Yami pours powdered cocoa mix into milk and stirs it. Then she microwaves the mixture for three minutes. When she takes the cup out, the handle is very warm. Steam rises from the cup, so she blows it before taking a sip. In which part of this scenario can convection be best observed?

A
stirring powdered cocoa mix into milk
B
touching the warm handle of the cup
C
rising steam from the cup of cocoa
D
pouring the cocoa mix into the milk
2
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The diagram shows the sun’s interior. Convection currents are present in the convection zone.

Question illustration
A
They change to solids near the Sun’s surface.
B
They change to solids near the Sun’s radiation zone.
C
They become more dense near the Sun’s surface.
D
They become more dense near the Sun’s radiation zone.
3

Water is boiling in a clear pot, as shown in the picture.

Question illustration
A
They are more spread out and moving faster than those at the surface.
B
They are closer together and moving faster than those at the surface.
C
They are more spread out and moving slower than those at the surface.
D
They are closer together and moving slower than those at the surface.
4

A student places a large pot of cold water on a stove and heats it for one minute. Then she takes the pot of water off the burner and places it on the counter. Which best describes the convection currents?

A
Convection currents move thermal energy from the stove to the pot, and then from the pot to the water.
B
After the stove is turned off, convection currents continue to transfer energy through the water for a period of time.
C
Convection currents in the water cause warmer, denser water to rise and transfer energy upward.
D
When the stove is turned on, convection currents cause an increase in the chemical energy of water molecules.
5

Water is boiling in a clear pot, as shown in the picture.

Question illustration
A
Thermal energy is transferred.
B
Water molecules gain kinetic energy.
C
Chemical energy is transferred.
D
Water molecules gain thermal energy.
6

Which area of Earth is most similar to the sun’s convection zone?

A
the crust
B
the equator
C
the mantle
D
the poles
7

Where could convection currents form?

A
in a sand dune
B
on a pavement
C
in the atmosphere
D
in outer space
8

When Xavier places his hands near a light bulb, he notices that certain areas around the light bulb are warmer than others. Which best explains this?

A
The areas to the sides of the light bulb are warmest because of conduction.
B
The areas to the sides of the light bulb are warmest because of convection.
C
The area directly above the light bulb is warmest because of conduction.
D
The area directly above the light bulb is warmest because of convection.
9

The lava lamp has a light bulb as a heat source at its base. The lamp contains a colored, waxy fluid that can be observed moving in clumps through a clear liquid.

Question illustration
A
density
B
temperature
C
kinetic energy of its molecules
D
space between its molecules
10

Which is required for convection to occur?

A
a solid substance
B
a heat source
C
boiling water
D
air molecules

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