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