Heat Transfer

Jill notices that her skin gets burned when she sits out in the sun. What best explains why this happens?

• The soil is convecting heat into the air.
• The heat from the sun is being conducted to the Earth.
• The heat from the sun is radiating down to Earth’s surface.

Which describes what can happen as a result of radiation?

• A piece of wood burns in a fire.
• A shirt is hot after having been ironed.
• A can of soup is heated in a pot on a stove.
• A car’s inside temperature rises to over 100 degrees on a sunny day.

Which is the best example of heat transfer by convection?

• frying bacon in a pan
• sea breeze at the beach
• melting ice in your hand
• burning your finger on the stove

Which is the best example of heat transfer by convection?

• frying bacon in a pan
• sea breeze at the beach
• melting ice in your hand
• burning your finger on the stove

Which best explains why a hot air balloon floats?

• The heated air expands to fill the balloon. The air in the balloon is now lighter than the surrounding air, causing the balloon to rise.
• The heated air expands to fill the balloon. The air in the balloon is now heavier than the surrounding air, causing the balloon to rise.
• The heated air contracts to fill the balloon. The air in the balloon is now denser than the surrounding air, causing the balloon to rise.
• The heated air contracts to fill the balloon. The air in the balloon is now lighter than the surrounding air, causing the balloon to rise.

How does heat energy from the sun reach Earth?

• conduction
• convection
• insulation
• radiation

A student places a cup of cold water on a counter in a hot room.   After a short time, the student notices that the water in the cup is no longer cold.  Which best explains why the water in the cup is no longer cold?

• The coldness of the water transferred to the air, making the water in the cup warmer.
• The coldness of the water was conducted to the cup, making the water in the cup warmer.
• The heat from the air transferred to the water in the cup, making the water in the cup warmer.
• The heat from the air caused the cold water in the cup to condense, making the water warmer.

On a hot summer day, a student dropped an ice cube onto a park bench. Within minutes, the ice cube melted. Which bestdescribes the process the student observed?

• radiation
• combustion
• conduction
• convection

Which is the best example of conduction?

• boiling a pot of water
• feeling heat from a fireplace
• a hot air balloon rising and falling
• touching a hot handle and getting 

Which material would be the best choice for a cooking tool to be used when grilling food over a fire?

• plastic
• metal
• paper
• wood