Loss of Magnetic Property

Q.

Which of the following activities will result in the loss of magnetic properties?

1. By immersing a magnet in water at room temperature.

2. Heating

3. Hammering

4. Keeping a magnet idle for a long time

Q. Permanent magnetism are demagnetized by:

1. Heating
2. Hammering
3. Dropping from a height
4. Keeping in water

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

1. Heating it strongly over a flame
2. Dropping it on the floor repeatedly
3. Hitting it with a hammer repeatedly
4. Coating it with a layer of oil

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

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

Q. Choose the incorrect statement among the following.

1. A bar magnet loses its magnetic property when dropped from a certain height.
2. A bar magnet that has been demagnetised can't be converted to a magnet again.
3. A bar magnet which is heated beyond a certain temperature loses its magnetic property.
4. A bar magnet loses its magnetic property when hammered repeatedly.

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. Which of the following may be destroyed when kept near a magnet?

1. Switch
2. Hard Disk
3. Tubelight
4. Bulb

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

1. Cutting
2. Rubbing
3. Cooling
4. Heating

Q. A magnet wouldn't lose its properties even after it is heated or hit hard.

1. True
2. False

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