- 1. Magnets are objects that produce a magnetic field which attracts certain materials like iron, nickel, and cobalt. They have two poles, the north pole and the south pole, which exhibit opposite magnetic properties. Magnets are used in a wide range of applications such as electric motors, generators, compasses, and magnetic resonance imaging (MRI) machines. The phenomenon of magnetism has been studied for centuries, leading to significant advancements in technology and science.
What is a magnet?
A) A type of metal wire.
B) An object that produces a magnetic field.
C) A type of plastic material.
D) A plant species.
- 2. Which material is most commonly used to create magnets?
A) Iron.
B) Wood.
C) Glass.
D) Rubber.
- 3. What is the name of the region around a magnet where its magnetic force is felt?
A) Heat boundary.
B) Electric zone.
C) Gravity area.
D) Magnetic field.
- 4. What happens when opposite poles of two magnets are brought close together?
A) They attract each other.
B) They create a neutral field.
C) They explode.
D) They repel each other.
- 5. What is a ferromagnetic material?
A) A material that is neutral to magnets.
B) A material that repels magnets.
C) A type of magnet.
D) A material that is strongly attracted to magnets.
- 6. What is the process of using small magnetic fields to read and write data on storage devices called?
A) Electric storage.
B) Plastic printing.
C) Magnetic recording.
D) Wood carving.
- 7. What is the SI unit of magnetic field strength?
A) Newton (N).
B) Tesla (T).
C) Watt (W).
D) Joule (J).
- 8. What is the term for the loss of magnetization in a magnet when exposed to external magnetic fields?
A) Neutralization.
B) Magnetization.
C) Demagnetization.
D) Polarization.
- 9. What is the study of magnets and their behavior known as?
A) Magnetronics.
B) Magnetics.
C) Magnetism.
D) Magnetology.
- 10. What is the maximum number of poles a magnet can have?
A) Three.
B) Two.
C) Five.
D) Ten.
- 11. What is the process by which a material becomes magnetized when exposed to a magnetic field and retains some level of magnetization after the field is removed?
A) Hysteresis.
B) Magnetic permaflux.
C) Magnetogenics.
D) Repolarization.
- 12. What protects the magnetic material in a compass from external magnetic fields?
A) A casing made of non-magnetic material.
B) A layer of oil.
C) A rubber band.
D) A metal cover.
- 13. What is the process of aligning magnetic domains in a material called?
A) Demagnetization.
B) Ionization.
C) Magnetization.
D) Polarization.
- 14. Which type of magnet retains its magnetism after being magnetized?
A) Permanent magnet.
B) Demagnetized magnet.
C) Temporary magnet.
D) Electromagnet.
- 15. Which scientist first discovered the magnetic field of the Earth?
A) Galileo Galilei.
B) Isaac Newton.
C) Albert Einstein.
D) William Gilbert.
- 16. Which of the following is a non-magnetic material?
A) Steel
B) Nickel
C) Wood
D) Cobalt
- 17. What is the magnetic field shape around a straight current-carrying wire?
A) Circular
B) Spiral
C) Square
D) Linear
- 18. How can you temporarily disrupt the magnetism of a magnet?
A) Freezing it.
B) Exposing it to water.
C) Shaking it vigorously.
D) By heating it.
- 19. What is the name of the process by which a material becomes magnetized when placed in a magnetic field?
A) Repulsion
B) Reflection
C) Absorption
D) Induction
- 20. What type of magnets are used in electric generators and motors?
A) Electromagnets.
B) Temporary magnets.
C) Permanent magnets.
D) Superconducting magnets.
- 21. What is the name of the naturally occurring magnetized mineral often used in compasses?
A) Magnetite
B) Pyrite
C) Gypsum
D) Hematite
- 22. What is the effect of passing an electric current through a coil of wire wrapped around an iron core?
A) Generating heat.
B) Creating an electromagnet.
C) Making a chemical reaction.
D) Producing light.
|