Magnets and electromagnets quiz

15 Questions

Quiz Description

In this quiz, you will see that, In our world today,  magnets are essential in electronic technology. Magnets are very useful, fun, and even a little mysterious. Magnets repel as well as they attract. The science of magnetism is tied to the modern science of electricity but has been recognized for many years now and In industrial society, magnets used in electrical generators convert mechanical energy to electricity and vice versa. This particular quiz is bent on helping you in preparation for your Exams, or tests on Magnets be it GCE, GCSE, or SATs. 

Magnetism in simple words is the power of a material to attract. It also refers to the attraction to iron and other metals in electric currents and magnets. Different kinds of magnetism cause some magnets to attract, while others cause them to repel.  We, therefore, need to take note here that magnetism is a very important topic and because we use it to create electrical energy, it does help in certain appliances to engineers and technicians.  Most of the energy that we use today is produced from rotating magnets. Some very essential properties of magnets are attractive, made up of 2 poles, also repel.
 An electromagnet any magnet that runs on electricity. Unlike permanent magnets, the strength of electromagnets can easily be changed, by changing the amount of electric current that flows through them. We realize that the poles of an electromagnet can even be reversed by reversing the flow of electricity. Moving charges create magnetic fields, so when the coils of wire in an electromagnet have an electric current passing through them, the coils behave like a magnet.  

To summarize, Magnets and electromagnets are used in a wide range of fields, like engineering, electrical engineers use magnets in most of their  Construction where almost all electrical gadgets, equipment, and machines are done using the properties of magnetism, like in transformers, electrical rotating machines. Several other quizzes are found in Physics on our website, be sure to visit them anytime and learn as there are also a variety of quizzes on other subjects.
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1:

Which of the following is TRUE?


Correct
  • 1:
     if object x is attacted by a magnet, x must be a magnet
  • 2:
     magnetic forces cannot act through magnetic materials
  • 3:
     unlike poles have no effect on each other
  • 4:
     if object x is repelled by a magnet, x cannot be a magnet
2:

WHAT HAPPENS when aluminium and a steel magnet are brought together?


Correct
  • 1:
    ATTRACT
  • 2:
    REPEL
  • 3:
    NOTHING
  • 4:
    PUSH
3:

Which can be picked up by a magnet?


Correct
  • 1:
      aluminium can
  • 2:
     brass door handle
  • 3:
     ceramic bowl
  • 4:
      steel paper clip
4:

WHAT HAPPENS when a steel bar magnet and an iron block are brought together?


Correct
  • 1:
     start to VIBRATE
  • 2:
    NOTHING
  • 3:
    ATTRACT each other
  • 4:
    REPEL each other
5:

WHAT HAPPENS when the two magnets are brought together?


Correct
  • 1:
    NOTHING
  • 2:
    REPEL
  • 3:
    ATTRACT
  • 4:
    PUSH
6:

WHAT HAPPENS when the two magnets are brought together?


Correct
  • 1:
    REPEL
  • 2:
    ATTRACT
  • 3:
    NOTHING
  • 4:
    PUSH
7:

WHAT HAPPENS when the two magnets are brought together?


Correct
  • 1:
    ATTRACT
  • 2:
    REPEL
  • 3:
    NOTHING
  • 4:
    PUSH
8:

Two blocks of iron are placed inside a coil through which a current is passed. Which of the following statements is NOT correct?


Correct
  • 1:
     the poles of the iron blocks will be [N-S] [N-S] or [S-N] [S-N] depending on the direction of current flow
  • 2:
     the blocks of iron become very slowly magnetised
  • 3:
     the iron blocks stay together even after the current is switched off
  • 4:
     the bocks of iron move towards each other
9:

Which can be picked up by a magnet?


Correct
  • 1:
      aluminium screw
  • 2:
        plastic fork
  • 3:
     pewter mug
  • 4:
     cobalt plate
10:

Which of the following is TRUE?


Correct
  • 1:
     magnetic forces can act through non-magnetic materials
  • 2:
    unlike poles have no effect on each other
  • 3:
     if object x is attacted by a magnet, x must be a magnet
  • 4:
    if object x is repelled by a magnet, x cannot be a magnet
11:

WHAT HAPPENS when the two magnets are brought together?


Correct
  • 1:
    THEY DO NOTHING
  • 2:
     THEY ATTRACT
  • 3:
     THEY VIBRATE
  • 4:
    THEY REPEL
12:

Which of the following is TRUE?


Correct
  • 1:
     the Earth's geographic north pole is actually the north pole of the Earth's magnetic field
  • 2:
     a freely moving magnet comes to rest pointing in a north-south direction
  • 3:
    magnetic forces cannot act through non-magnetic materials
  • 4:
     magnetic forces can act through magnetic materials
13:

Two blocks of iron are placed inside a coil through which a current is passed. Which of the following statements is NOT correct?


Correct
  • 1:
     the poles of the iron blocks will be [N-S] [S-N] or [S-N] [N-S] depending on the direction of current flow
  • 2:
     the bocks of iron move towards each other
  • 3:
      the iron blocks stay together even after the current is switched off
  • 4:
     the blocks of iron become quickly magnetised
14:

Which is TRUE for the effect of switching ON the d.c. in the two circuits shown above?


<p>Which is TRUE for the effect of switching ON the d.c. in the two circuits shown above?</p>
Correct
  • 1:
    there is a much stronger magnetic field produced in coil 1
  • 2:
     there is no magnetic field outside coil 2
  • 3:
     the iron rod strengthens the magnetic field in coil 2
  • 4:
      there is no magnetic field produced in coil 1
15:

The sketch on the left shows the design of a simple circuit breaker. These are safety switches which 'break' the circuit if the current becomes too large. What should the coil surrounding the core be made of?


<p>The sketch on the left shows the design of a simple circuit breaker. These are safety switches which 'break' the circuit if the current becomes too large. What should the coil surrounding the core be made of?</p>
Correct
  • 1:
      bare copper wire
  • 2:
     steel wire
  • 3:
      insulated steel wire
  • 4:
     insulated copper wire

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Magnets and electromagnets quiz
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