A And B Heat

Conduction can only occur between two objects when –

• one object is less dense than the other.
• both objects are in physical contact with each other.
• one of the objects is made of a metal.
• both objects are exactly the same temperature.

Look at the picture provided.
In the situation illustrated, how will heat energy move? Heat energy will be transferred from –

• the water to the hot plate by convection.
• the water to the hot plate by conduction.
• the hot plate to the water by convection.
• the hot plate to the water by conduction.

Radiation is a method of thermal energy transfer. It refers to the transfer of heat energy that moves –

• through empty space in waves.
• when objects touch.
• only through solids.
• in the motion of fluids.

Which of the following is an example of a situation in which an egg is receiving thermal energy through convection?

• The egg is kept warm by its mother in the nest
• An egg cracked on a hot sidewalk starts to cook
• The egg is hard boiled in a pot of water
• A metal pan on the stove fries the egg

Three metal cubes with different temperatures are placed side-by-side as shown in the picture provided.  

Which of the following describes a way in which heat energy will be transferred by conduction.

• Sample 1 to Sample 2
• Sample 3 to Sample 2
• Sample 3 to Sample 1
• Sample 2 to Sample 3

Thermal energy always moves from –

• large objects to small objects.
• dark objects to light objects.
• warm objects to cool objects.
• smooth objects to rough objects.

Which of the following is an example of heat transfer by conduction?

• Sunlight warming a room early in the morning
• A metal spoon getting hot in a bowl of soup
• Warm and cold water circulating in an ocean
• Hot air rising and cold air sinking on a beach

A student notices that the saucer below a coffee cup becomes warmer after coffee is poured into the cup. Energy was transferred from –

• the cup to the saucer by conduction.
• the saucer to the cup by conduction.
• the cup to the saucer by convection.
• the saucer to the cup by convection.

Which of the following is an example of heat transfer through radiation?

• A pot of soup warming on a hot burner
• A crayon melting on a hot sidewalk
• Beach sand getting warmed by the Sun
• An egg getting cooked in a pot of boiling water

Look at the table provided.
Water at 40º C was placed into containers made of four different materials. An initial temperature was taken, and a final temperature was taken after 10 minutes.
How much did the temperature change during the experiment for the container that allowed the most transfer of thermal energy? Bubble your answer below in ºC.

• 20
• 10
• 22
• 12