Discovery of Magnets

Q.

Provided a metal piece and a thread, what else is necessarily required to find out if the metal piece is a magnet or not?

1. A piece of magnetic substance.

2. We do not require anything more.

3. A magnet or a compass.

4. A piece of non-magnetic substance.

Q. Harish was asked to identify a soft iron placed in a basket with 9 other magnets of the same shape and size. Which is the easiest way of identifying the iron piece at the earliest?

1. By suspending the magnets one at a time.
2. By conducting repulsion test using any two magnets at a time.
3. By heating all the magnets together.
4. By dropping all the magnets into the water.

Q.

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

1. Cobalt

2. Nickel

3. Silver

4. Iron

Q.

Magnets are used in making which of the following ?

1. Motors

2. Tables

3. Electrical wires

4. Plastic Toys

Q.

Substances that have the property of attracting iron are known as _________.

1. magnets

2. fullers

3. insulators

4. conductors

Q. Substances that have the property of attracting iron are known as _________.

1. magnets
2. protons
3. insulators
4. resistors

Q.

Question 2 (ii)

State whether the following statement is true or false.

Artificial magnets were discovered in Greece.

Q. Magnet was found in a place called :

1. Asia
2. Europe
3. Magnesia
4. Denmark

Q. What is a magnet?

Q. Magnetite contains which metal ?

1. Steel
2. Copper
3. Iron
4. Aluminium