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