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