Energy Review

Convection can take place in _________________.

• solids only

• liquids only

• liquids and gases only

• solids, liquids and gases

The diagram shows some rice being boiled in a pan. What is the main methods by which thermal energy is transferred (i) through the metal pan and

(ii) through the water?

• (i) conduction (ii) conduction

• (i) convection (ii) convection

• (i) conduction (ii) convection

• (i) convection (ii) conduction

The way the heat is moving from the hot coffee is called...

• convection
• radiation
• insulation
• conduction

Heat transfers from an area of ____temperature to an area of ___ temperature.

• high to low
• low to high
• high to high
• It can travel high to low and low to high. 

What does heat do when convection currents are moving?

• Sinks

• Rises

• Stays in place

Which picture shows material that is more dense?

• The picture of the left

• The picture on the right

Why does ice float?

• Due to convection currents

• It is more dense than water.

• It is less dense than 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.

Which of the following correctly shows the direction of convection currents in water?

• A

• B

• C

• D

Some dye in a beaker of water is gently heated. Why are the streaks of dye seen in the water?

• The hot dye is a better conductor than the cool water.

• The hot dye is a better convector than the cool water.

• The hot water is less dense than the cool water.

• The hot water is denser than the cool water.