Science 7 Final Exam Review 2019

The diagram shows a Bunsen burner heating a beaker of water on a beaker stand. The arrows represent the transfer of heat energy in the water.

Which process is primarily responsible for the transfer of heat indicated by the arrows in the

beaker of water?

• conduction

• convection

• radiation

• condensation

Water vapor changes to liquid water during

which process?

• dissolving

• melting

• evaporation

• condensation

Identify the heat-transfer process represented by the arrows in the diagram.

• conduction

• radiation

• condensation

• convection

If the temperature of the water in cup A continues to decrease as shown on the graph, what will the

approximate temperature of the water in cup A be at the end of 25 minutes?

• 25°C

• 30°C

• 78°C

• 85°C

If the aluminum bar were shorter, the cool water in cup B would increase in temperature at a faster rate

because

• less heat would be produced by the water

• less heat would be lost to the surrounding air

• more heat would be produced by the water

• more heat would be lost to the surrounding air

Magnets A and B are of equal magnetic strength. In which position will magnets A and B have the greatest attractive force toward each other?

• 
• 
• 
• 

The diagram shows four identical magnets that have been dipped into piles of shavings of four different metals.

What conclusion can be made about a magnet’s ability to attract metals based on what is shown in this diagram?

• Magnets do not attract all metals

• Magnets only attract aluminum and copper.

• Magnets attract all metals.

• Steel is the only metal that magnets attract.

Scientists have created trains that use magnets to

make the trains float above the tracks as they

travel. These trains float because

• the track is waxed

• the like poles repel

• the train has a low density

• a chemical change occurs

The diagram represents a bar magnet. When iron filings were placed near the magnet, they moved

to form the pattern shown.

Why more iron filings are located at the ends of the magnet than at the center of the magnet?

• The magnetic force is strongest at the poles.

• The magnetic force is strongest in the center of the magnet.

• The magnetic force is weakest at the poles.

• This pattern is a random result from shaking.

Plastic is used to cover the copper wires in the

power cords of appliances because plastic differs

from copper in

• density

• hardness

• phase at room temperature

• electrical conductivity