Demagnetisation

Q. The magnetic properties of a magnet can be destroyed if ____.

1. it is heated strongly
2. it is used to attract magnetic material
3. it is kept unused for a while
4. it is kept in water

Q. The magnetism of a magnet is destroyed if:

1. The magnet is heated.
2. The magnet is thrown.
3. The magnet is broken into pieces.
4. Opposite poles of two magnets are kept together.

Q.

Which of the following ways will NOT cause a magnet to lose its magnetism?

1. Heating it strongly over a flame

2. Dropping it on the floor repeatedly

3. Coating it with a layer of oil

4. Hitting it with a hammer repeatedly

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. Melting

Q. The magnetic property can be enhanced by hitting a magnet strongly.

1. True
2. False

Q.

The magnetic strength and polarity of a ______ can not be changed.

Q. How will hammering a bar magnet affect Its magnetic strength?

1. Is likely to decrease
2. Is likely to increase
3. Will not change
4. None of the above

Q. How do magnets lose their magnetic property? What can be done to keep them safe?

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. Melting

Q. The magnetic force of the magnet _____ after heating

1. increases
2. decreases
3. remains same
4. is unpredictable

Q. The magnetic strength of the magnet after heating.

1. increases
2. decreases
3. remains same

Q. The strength of the magnet after heating.

1. increases
2. decreases
3. remains same

Q. How many soft iron piece(s) is/are required to store a horseshoe magnet?

1. 1
2. 2
3. 4
4. 0

Q. The following image shows one way of storing bar magnet. Label the parts of the image accordingly.

1. Soft iron
2. Bar magnet
3. Wooden piece

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

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

Q. The purpose of a magnet keeper is to____.

1. use up the magnetic energy
2. keep magnets from getting physically damaged
3. enhance the properties of a magnet
4. retain the properties of a magnet

Q. The following image shows one way of storing bar magnet. Label the parts of the image accordingly.

1. Soft iron
2. Bar magnet
3. Wooden piece

Q. Which of the following methods can't be used to demagnetise a magnet?

1. Dropping
2. Heating
3. Rubbing
4. Cooling
5. Breaking
6. Hitting
7. Wetting
8. Kept Unused

Q. What are magnetic keepers? Name its material.

Q.

Which of the following ways will NOT cause a magnet to lose its magnetism?

1. Heating it strongly over a flame

2. Dropping it on the floor repeatedly

3. Coating it with a layer of oil

4. Hitting it with a hammer repeatedly