Magnet and Magnetite

Q.

Explain the mechanism of attraction of iron nails by a magnet when brought near them.

Q.

The word magnet has been derived from ___.

Q.

What is a natural magnet? State two limitations of a natural magnet.

Q.

Differentiate between the artificial magnet and natural magnet.

Q.

Magnetite $\left[Fe₃O₄\right]$ is the world’s first magnet

1. True
2. False

Q.

___ is a naturally occurring magnetic substance

Q.

Magnetite is a natural magnet.

1. True
2. False

Q.

Cow magnet is used to prevent hardware disease in cattle.

1. True

2. False

Q.

Which of the following devices contain a magnet

1. Torch

2. Radio

3. Fan

4. Compass

Q.

In olden days, sailors used to find direction by suspending a piece of ___ magnet.

Q.

Encircle the odd one out. Give reason for your choice.

Bar magnet, cylindrical magnet, ring magnet, lodestone and horseshoe magnet

Q.

Natural magnets are stronger than artificial magnets.

1. True
2. False

Q.

Natural magnets can be termed as permanent magnets.

1. True
2. False

Q.

Which of the following magnetic ore was once used as a primitive compass?

1. Lodestone

2. Hematite

3. magnetite

4. None of these

Q.

Which of the following does NOT contain a magnet in it?

1. A torch

2. A television

3. Both (B) and (C)

4. A radio

Q.

Comment on the statement, “induction precedes attraction”

Q. What is it in a magnet that makes it attract only iron and not other metals or substances like wood, plastic, glass, etc.? Why does a magnet attract only iron?

Q.

Lodestone is a

1. artificial magnet

2. electromagnet

3. natural magnet

4. bar magnet

Q.

Cobalt and nickel are

1. magnetic materials

2. non-magnetic materials

3. electrical materials

4. none of these

Q.

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

1. Heating it strongly over a flame

2. Hitting it with a hammer repeatedly

3. Dropping it on the floor repeatedly

4. Coating it with a layer of oil

Q. The Earth acts as a giant bar magnet.

1. False
2. True

Q.

why the natural magnets are kept safely kept in wooden box n protected from sunlight?

Q. Like charges .......... each other.

Q.

what is there in magnet that magnet attracts magnetic substances.