Magnet and Magnetite

Q.

Write 3 the difference between magnetic and non magnetic materials.

Q.

Magnetite is a natural magnet.

1. Artificial magnet

2. Natural magnet

Q.

Can magnets attract Aluminum?

Q.

Plastic is not a magnetic material.

1. True

2. False

Q.

Is stainless steel a magnetic or non-magnetic material?

Q.

Magnetite is a/an ______.

1. Natural magnet

2. Artificial magnet

3. Not a magnet

4. Electromagnet

Q.

Define magnetic substances.

Q. materials lose their magnetism permanently if they are heated above a temperature known as temperature.

1. Ferromagnetic
2. Diamagnetic
3. demagnetizing
4. Curie

Q. What are magnetic and non-magnetic materials? Explain and categorise the given substances into two groups-magnetic and non-magnetic.
Keys, Glass, Wood, Nail, Book, Rubber, Fork, Sand, Iron particles, Chalk, Alpin

Q.

Question 2 (ii)

State whether the following statement is true or false.

Artificial magnets were discovered in Greece.

Q.

Name two magnetic substances.

Q.

What is the difference between magnetic and non-magnetic materials? Give examples.

Q.

What are various types of magnetic substances? Give two examples.

Q.

Define non-magnetic substances.

Q.

Cobalt is a non-magnetic substance.

1. True
2. False

Q.

In a permanent magnet at room temperature:

1. Magnetic moment of each molecule is zero.

2. The individual molecules have non-zero magnetic moments which are all perfectly aligned.

3. Domains are partially aligned.

4. Domains are all perfectly aligned.

Q. The earth acts as a giant magnet.

1. horse-shoe
2. bar
3. temporary

Q.

Statements given below are incorrect. Write the correct statements.

A horse shoe magnet causes less magnetic attraction than a bar magnet.

Q. Which of the following is true in case of bar magnets?

1. It always attracts copper and steel. While its like poles repel each other.
2. Its like poles attract each other, unlike poles repel each other.
3. Its like poles repel each other, unlike poles attract each other.
4. Strength of these magnets can be changed.

Q.

__________ is a region where a magnet exhibits its magnetic influence.

1. Radiation

2. Heat

3. Painting

4. Other magnets in close proximity to the magnet

Q.

An unmagnetized steel bar buried in the earth in the north-south direction would, after a few days, exhibit magnetic properties, making it a weak magnet.
Explain by giving reasons how this is possible.
In what way will the effect be different if the steel bar is to be placed above the surface of the earth?

Q.

What is a non-magnetic substance? Give two examples.

Q. Harry took a glass tumbler and put some iron nails in it. When the magnet is brought near the glass tumbler, the nails come towards the magnet because:

1. Iron nails are magnetic material.
2. Glass tumblers are magnetic material.
3. Iron nails are non-magnetic material.
4. Iron nails are magnets.

Q. The earth acts as a giant magnet.

1. horse-shoe
2. bar
3. temporary

Q. Find the odd one out.

1. Cylindrical magnet
2. Horseshoe magnet
3. Lodestone
4. Bar magnet

Q. Differentiate between magnetic and non-magnetic materials. Also, provide an example for each.

Q.

Question 1 (i)

Fill in the blank in the following.
Artificial magnets are made in different shapes such as ___, ___ and
___.

Q.

What is the difference between magnetic and non-magnetic materials? Give examples. [3 MARKS]

Q. Identify the magnetic material from the following

1. Gold
2. Wood
3. Iron
4. Silver

Q. What are magnetic and non-magnetic materials? Explain and categorise the given substances into two groups-magnetic and non-magnetic.
Iron key, Glass, Wood, Nail, Book, Rubber, Fork, Sand, Iron particles, Chalk, Alpin