Pretest

Question 1

Which best describes the shape of a convection current?

Revolt · Accepted Answer

circular

Question 2

Which is required for convection to occur?

Revolt · Accepted Answer

a heat source

Question 3

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?

Revolt · Accepted Answer

After the stove is turned off, convection currents continue to transfer energy through the water for a period of time.

Question 4

Which best describes the convection currents in Earth’s mantle?

Revolt · Accepted Answer

They transfer thermal energy away from Earth’s core toward its crust.

Question 5

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?

Revolt · Accepted Answer

The area directly above the light bulb is warmest because of convection.

Question 6

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

Revolt · Accepted Answer

the mantle

Question 7

Where could convection currents form?

Revolt · Accepted Answer

in the atmosphere

Question 8

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?

Revolt · Accepted Answer

rising steam from the cup of cocoa

Question 9

In a convection current, as the temperature of a fluid increases, what property of the fluid decreases?

Revolt · Accepted Answer

density

Question 10

Which takes place as water cycles from the bottom of the pot toward the top?

Revolt · Accepted Answer

Thermal energy is transferred.

Pretest Answers

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