1.
Magnetism is an example of a type of:
Correct Answer
A. Force
Explanation
Magnetism is an example of a force because it is a fundamental interaction between objects that can attract or repel each other. It is caused by the movement of electric charges, specifically the alignment of electrons in atoms or molecules. This force can be observed when magnets attract or repel each other, or when a magnet attracts certain materials such as iron. Magnetism is not a form of matter or light, but rather a force that acts upon matter.
2.
If magnet A can attract and hold 2 steel pins and magnet B can attract and hold 4 steel pins, which magnet is stronger?
Correct Answer
B. Magnet B
Explanation
Magnet B is stronger because it can attract and hold twice as many steel pins as magnet A.
3.
All of these metals are nonmagnetic (not attracted to a magnet) except:
Correct Answer
A. Copper
Explanation
Copper is the correct answer because it is a nonmagnetic metal. Unlike steel and aluminum, which can be attracted to a magnet, copper does not have magnetic properties. Gold, on the other hand, is also nonmagnetic. Therefore, the only metal in the given options that is not nonmagnetic is copper.
4.
Like poles of a magnet _____ each other, while unlike poles ____ each other.
attract, attract
Correct Answer
B. Repel, attract
Explanation
Like poles of a magnet repel each other because they have the same magnetic polarity, causing a force of repulsion between them. On the other hand, unlike poles of a magnet attract each other because they have opposite magnetic polarities, resulting in a force of attraction between them.
5.
Some non-metals are magnetic. What is an example of a magnetic non-metal?
Correct Answer
D. Liquid oxygen
Explanation
Liquid oxygen is an example of a magnetic non-metal because it is a non-metal and exhibits magnetic properties.
6.
A bar magnet has two poles. What are they called?
Correct Answer
A. North, South
Explanation
A bar magnet has two poles called the North pole and the South pole. These poles are named based on the Earth's magnetic field, where the North pole of a magnet aligns with the Earth's magnetic North pole and vice versa. The North pole of a magnet attracts the South pole of another magnet, while like poles repel each other. This is a fundamental concept in magnetism and is widely used in various applications such as compasses and magnetic storage devices.
7.
Where is the magnetic force of a bar magnet the strongest?
Correct Answer
C. At either end or pole of the magnet
Explanation
The magnetic force of a bar magnet is strongest at either end or pole of the magnet. This is because the magnetic field lines are concentrated and closer together at the poles, resulting in a stronger magnetic force. In contrast, the magnetic force is weaker in the center of the magnet where the magnetic field lines are more spread out.
8.
Does distance strengthen or weaken a magnet's ability to attract a steel object?
Correct Answer
B. It weakens it.
Explanation
The distance between a magnet and a steel object weakens its ability to attract the object. As the distance increases, the magnetic field strength decreases, resulting in a weaker attraction. Therefore, the farther the magnet is from the steel object, the weaker the attraction will be.