Magnetism Quiz

What is a magnetic field?

• A region around a magnetic material where gravity is stronger

• A type of energy field that repels all metal objects

• A region around a magnetic material or a moving electric charge within which the force of magnetism acts.

• A force that only affects non-metallic objects

Aseda and Akyedie are working on a project to build a new type of motor. As they discuss the project, they come across a key concept: What is the difference between a permanent magnet and an electromagnet?

• A permanent magnet produces a constant magnetic field without the need for an external power source, while an electromagnet produces a magnetic field only when an electric current is passed through it.

• A permanent magnet can be turned on and off by passing an electric current through it, while an electromagnet always produces a constant magnetic field.

• A permanent magnet is made of a material that can be magnetized, while an electromagnet is made of a material that cannot be magnetized.

• A permanent magnet produces a magnetic field only when an electric current is passed through it, while an electromagnet produces a constant magnetic field without the need for an external power source.

Answer explanation

A permanent magnet produces a constant magnetic field without an external power source, while an electromagnet requires an electric current to produce a magnetic field.

What are the two types of magnetic poles?

• East pole and west pole

• Positive pole and negative pole

• Up pole and down pole

• North pole and south pole

How does light interact with a magnetic field?

• It emits a sound

• It becomes invisible

• It changes its polarization direction.

• It changes its color

Answer explanation

Light changes its polarization direction when it interacts with a magnetic field.

Explain the concept of electromagnetic induction.

• The process of generating a magnetic field in a stationary conductor

• The process of generating an electric current in a stationary conductor

• The process of generating an electromotive force (emf) or voltage across a conductor when it is exposed to a changing magnetic field.

• The process of generating heat in a conductor when exposed to a changing magnetic field

Answer explanation

Electromagnetic induction is the process of generating an electromotive force (emf) or voltage across a conductor when it is exposed to a changing magnetic field.

What is the role of the respiratory system in the context of a science experiment?

• It repels magnetic fields to protect the lungs

• It has no role in the context of the experiment.

• It generates a magnetic field to aid in breathing

• It helps to attract magnetic particles to the lungs

How does the Earth's magnetic field affect navigation?

• It causes GPS systems to malfunction

• It creates a barrier that prevents ships from traveling

• It has no effect on navigation

• It provides a reference for compasses to determine direction.

What are the applications of magnetism in everyday life?

• Traffic lights

• Clothing materials

• Electric motors and generators

• Cooking utensils

Answer explanation

Magnetism is used in electric motors and generators, which are essential for various applications in everyday life.

Aseda and Akyedie are working on a project to understand the process of magnetization and demagnetization. Can you explain the process to them?

• Magnetization is the process of aligning the magnetic domains in a material to create a magnetic field. Demagnetization is the process of aligning the magnetic domains to strengthen the magnetic field.

• Magnetization is the process of aligning the magnetic domains in a material to remove the magnetic field. Demagnetization is the process of disrupting the alignment of the magnetic domains to create a magnetic field.

• Magnetization is the process of aligning the magnetic domains in a material to create a magnetic field. Demagnetization is the process of disrupting the alignment of the magnetic domains to remove the magnetic field.

• Magnetization is the process of creating an electric field. Demagnetization is the process of creating a magnetic field.

Answer explanation

Magnetization aligns domains to create a magnetic field. Demagnetization disrupts alignment to remove the field.

How are magnetic fields used in medical imaging?

• By measuring blood pressure

• By creating detailed images of the inside of the body.

• By detecting brain waves

• By monitoring heart rate

Answer explanation

Magnetic fields are used in medical imaging to create detailed images of the body's interior.