Grade 3 Science Practice Test: Magnets and Static Electricity
- Magnets and Static Electricity
- 10 questions
- 13 minutes
Magnets and static electricity can push or pull objects without touching them. Pay attention to the poles of a magnet and to how far apart objects are.
Tap an option to mark your answer. You can change your mind, or tap the same option again to leave the question blank. The correct answers and explanations appear when you finish the test.Tap an option to answer; tap it again to leave the question blank.
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Question 1
Which object will a magnet pull toward it?
Correct answer: D
Magnets attract objects that contain iron, such as steel. Aluminum is a metal, but magnets do not attract it.
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Question 2
Jon holds the north pole of one bar magnet near the north pole of another bar magnet.
What will happen?
Correct answer: A
Like poles (north and north, or south and south) repel each other. Only opposite poles attract.
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Question 3
What happens when the north pole of one magnet is brought near the south pole of another?
Correct answer: B
Opposite poles attract, so north and south pull toward each other.
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Question 4
Mia puts a sheet of paper on a table and a paper clip on top. She moves a magnet under the table and the paper. The paper clip moves along with the magnet.
What does this show?
Correct answer: C
The magnet never touched the clip, yet it still pulled it. Magnetic force can pass through paper and a thin tabletop.
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Question 5
A class tested whether a magnet could move a paper clip from different distances.
Magnet test Distance Did the clip move? 1 cm Yes 2 cm Yes 3 cm Yes 4 cm No 5 cm No Which conclusion fits the data?
Correct answer: C
The clip moved when the magnet was close and stopped moving when it was 4 cm or more away. So the magnetic pull weakens with distance.
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Question 6
A recycling center wants to separate steel cans from aluminum cans.
Which tool would work best?
Correct answer: B
A magnet pulls the steel cans out of the pile and leaves the aluminum cans behind, because magnets do not attract aluminum.
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Question 7
Eva rubs a balloon on her hair. When she lifts the balloon, her hair rises toward it without touching it.
Which force pulls her hair?
Correct answer: D
Rubbing gives the balloon an electric charge, which pulls on the hair. Hair is not attracted to magnets, and gravity pulls things down, not up.
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Question 8
Which object is not attracted to a magnet?
Correct answer: A
Glass does not contain iron, so a magnet does not pull it. Iron and steel objects are attracted.
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Question 9
Why does a compass needle point north?
Correct answer: B
A compass needle is a small magnet. Earth acts like a giant magnet, so the needle lines up and points north.
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Question 10
How can you make a magnet pull harder on a paper clip?
Correct answer: A
Magnetic force is stronger at short distances. A thick book adds distance and weakens the pull, and color makes no difference.
Questions you leave blank are not counted as wrong.
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