Physical Science GMAS Review

Electromagnets and solid permanent magnets will both attract iron. How are electromagnets different than permanent magnets?

• Permanent magnets use a coil of wire.

• Electromagnets can be made of plastic.

• Electromagnets can be turned off.

• Permanent magnets can be turned off.

Which of the following is an example of a chemical change?

• water is boiled

• cookies are crushed

• ice is melted

• wood is burned

Ashley constructed the device shown below to test whether certain objects can conduct electricity.

Ashley is going to test four different objects - a wooden toy, a rubber eraser, an iron nail, and a plastic fork. One at a time, she will place each object to both metal terminals at the same time. Which object will most likely cause the light bulb to light up when she touches it to both terminals at the same time?

• the rubber eraser

• the plastic fork

• the wooden toy

• the iron nail

Samantha gathers ingredients to bake a cake. She mixes them together in a bowl. Then she turns on the oven. Afterward, she adds the cake mixture to a baking pan, as shown in image 1. She then places the baking pan in the hot oven to bake. The cake mixture becomes darker and begins to harden after being heated, as shown in image 2.

Why is heating cake mixture to bake a cake considered a chemical change?

• The cake mixture darkens in color and changes in texture when it is heated.

• The cake is made up of the same material as the cake mixture.

• The cake has the same mass as the cake mixture.

• The cake mixture increases in temperature as it is heated.

Which of the following is an example of a physical change?

• a slice of bread turning brown in a toaster

• cake batter being baked in an oven

• an egg being cooked on a stove

• a chocolate bar melting on a hot day

Static electricity is the buildup of electric charges. Which of the following is an example of a natural discharge of static electricity?

• northern lights

• lightning

• Earth's magnetic poles

• ocean waves

Which of the following describes an example of static electricity?

• A plastic comb attracts small pieces of paper after it is rubbed with another object.

• A motor spins continuously because of electricity and magnetism.

• When a switch is flipped, a light immediately turns on.

• A radio plays music loudly even though it is not plugged into an outlet.

Libby is doing experiments with two different magnets. Magnet A can only attract thumbtacks that are up to 1 inch away from it. Magnet B can attract thumbtacks that are up to 3 inches away from it.

What is likely true of the magnets?

• Magnet B is stronger than magnet A.

• Magnet A is rectangular, and magnet B is shaped like a horseshoe.

• Magnet A is stronger than magnet B.

• Magnet B is rectangular, and magnet A is shaped like a horseshoe.

Which of the following is an example of a physical change?

• toasting a slice of bread in a toaster

• frying an egg on a hot stove

• heating water on a hot stove

• baking a cake in a hot oven

Erika wants to experiment with sugar cubes. Which of the following causes a sugar cube to change only physically, not chemically?

• chewing the sugar cube and digesting it

• breaking the sugar down into different substances using sulfuric acid

• crushing the sugar cube and dissolving it in water

• burning the sugar cube with a match