Introduction to Magnets

Q. Which of the following is the strongest magnet?

1. Silver magnet
2. Steel magnet
3. Neodymium magnet
4. Cobalt magnet

Q.

Bar magnets always point towards North-South direction. (True or False)

1. True
2. False

Q.

Compasses point north because the Earth is basically a giant magnet.

1. True

2. False

Q.

A magnet always attracts wood.

1. True
2. False

Q.

Lodestone is an ore of iron found in the earths crust.

1. True
2. False

Q.

Which of the following illustrates the property of a magnet?

1. Like pole repel each other

2. Opposite poles attract each other

3. It attracts magnetic material towards it

4. It repels non-magnetic materials away

Q.

The statements given below are incorrect. Write the correct statements.

Television sets use permanent magnets for accurate reception.

Q. How did we cone to know which pole is north and which pole is South?

Q.

Hope you were paying attention! Now, based on what you have learned till now in this video, if you think of the earth having a bar magnet like this:

Then which among these looks like the most probable orientation of the bar magnet with respect to the Earth's North Pole and South pole (geographical poles they are called, as you will learn shortly)?

1. 

2. 

3. 

4. 

Q.

____ poles attract each other and _____ poles repel each other.

Q. Which among the following is true?
(i) All metals are magnetic materials.
(ii) All non-metals are non-magnetic materials.

1. Only (i)
2. Only (ii)
3. Both (i) and (ii)
4. None of (i) and (ii)

Q.

How to find out our way with the help of the magnet?

Q. List down any five uses of magnets?

Q.

State the position of neutral points when a bar magnet is placed on a table with its north pole facing geographic south.

Q. If we take the like poles of the two magnets and stick it with untarable tape what will happen will it stick then why we say that like poles repel

Q.

How does a suspended bar magnet come to rest near the earth surface

Q.

Write two uses of magnets.

Q.

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

1. magnets

2. fullers

3. insulators

4. conductors

Q. To make powerful magnets, the alloy used is :

1. Alnico
2. aluminum
3. cobalt
4. ferrites

Q.

Statements given below are incorrect. Write the correct statements.

Opposite poles of two different magnets repel each other.

Q. List down any four uses of magnets?

Q. List down any four uses of magnets?

Q.

State true or false: A magnet always attracts wood.

1. True
2. False

Q.

Harish was asked to identify a piece of soft iron put in a basket of 10 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 bringing another strong magnet near the basket

4. By dropping all magnets into the water

Q. In which direction will a freely suspended bar magnet get aligned? Why?

Q.

__________ is/are the surest test(s) for magnetism.

1. None of these

2. Repulsion

3. Attraction

4. Both attraction and repulsion

Q.

Which of the following is/are NOT a magnetic material?

1. Cobalt

2. Iron

3. Plastic

4. Nickel

Q. Which among the following is true?
(i) All metals are magnetic materials.
(ii) All non-metals are non-magnetic materials.

1. Only (i)
2. Only (ii)
3. Both (i) and (ii)
4. None of (i) and (ii)

Q. A magnetic compass is used to indicate

1. directions
2. speed
3. distance
4. time

Q.

___ is a property by virtue of which a substance either attracts or repels the same substance.

1. Galvanisation

2. Electrolysis

3. Electric flux

4. Magnetism