Making Magnets

Q. what are natural magnets ? what is the difference between normal and natural magnet ?

Q.

Which among the following material cannot be used to make a magnet?

1. Cobalt

2. Iron

3. Copper

4. Steel

Q. Can magnets work in water ?

Q.

Can steel be made into a permanent magnet?

Q. How should we store a magnet?

Q. Why is it important to place a magnet keeper in a box along with magnets?

Q. Satish magnetised a piece of iron marked W, X, Y and Z using the rubbing method as shown in the figure.

Which of these parts of the iron piece will become the north pole?

1. W
2. X
3. Y
4. Z

Q.

Which of the following do not have a permanent magnet?

1. Magnetic door catcher

2. Electric bells

3. Compass

4. Mixer

Q.

What is demagnetization?

Q.

What are the precautions to be taken care while magnetizing sewing needle using a single touch method ?

Q.

You are given an iron strip. How will you convert it into a magnet? [5 MARKS]

Q.

Assertion: Steel is attracted by a magnet

Reason: Steel is not a magnetic substance

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true and R is not correct explanation of A.
3. A is true, but R is false
4. A is false, but R is true

Q. Choose the correct statement.

1. Magnets are used in telephones, doorbells, mixer and grinder, fans, and more.
2. Magnets are used to hold objects like stickers, refrigerator doors, and more
3. Magnets are used for make compasses.
4. All of the above

Q. Which of the following object does not contain a magnet?

1. Speaker
2. Microphone
3. Torch
4. Debit card

Q.

why coins are made up of iron or other magnetic materials only ? Why are they not made up of steel or any other non magnetic materials?

Q. How should we store a magnet?

Q. Which of the following is/are artificial magnets?

1. Bar magnet
2. Horse-shoe magnet
3. Ball ended magnet
4. Magnetite

Q. A/An can be magnetised by rubbing it with a magnet from one end to the other.

1. non-metal
2. iron piece
3. copper piece

Q. The magnetic properties of a magnet can be destroyed by:

1. Hammering
2. Heating
3. Rubbing on sand
4. Suspending
5. Dropping down
6. Cooling
7. Passing current
8. Lightning

Q. Which among the following is necessary to convert an iron bar into a magnet?

1. Another identical iron bar
2. A bar magnet
3. Any metallic bar
4. Any magnetic material

Q. A steel pin can be made into a permanent magnet when rubbed with another magnet.

1. False
2. True

Q. A/An can be magnetised by rubbing it with a magnet from one end to the other.

1. copper piece
2. iron piece
3. non-metal

Q.

Which of the following is not used for making permanent magnets?

1. Iron

2. Nickel

3. Silver

4. Cobalt

Q. A magnet can be made from any metal.

1. True
2. False

Q. Natural magnets are the result of natural occurences like lightning.

1. True
2. False