Demagnetisation

Q.

Can magnets lose their magnetic property? Give reasons for your answer. [5 MARKS]

Q.

What is demagnetization ?

Q.

What is demagnetisation?

Q.

Can we demagnetize a magnet by dropping it from a height?

1. True

2. False

Q.

How do magnets lose their magnetic property? What can be done to keep them safe? [5 MARKS]

Q.

Magnets can lose their property if they are:

1. If they are heated

2. If they are hammered

3. If they are dropped from height

4. All of these

Q.

Micr stands for

Q.

The way(s) by which we can demagnetize a magnet is/are

1. by hammering it.

2. by burning it.

3. by bringing it close to another magnet.

4. by digging it inside earth's surface.

Q.

Why does a magnet gets demagnetised whenwits hit to anything or heated or if kept undisturbed for a long time?

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.

Keepers are used to prevent ___ of magnet.

Q.

Permanent magnets get easily demagnetized.

1. True
2. False

Q.

Magnetic keeper is a wooden piece.

1. True
2. False

Q. Permanent magnetism are demagnetized by:

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

Q.

A natural magnet can self-demagnetise.

1. True

2. False