Magnetic Substances

Q.

Write any two properties of Magnet.

Q.

What is the Curie temperature of a ferromagnetic material?

Q.

Is steel a ferromagnetic material?

Q.

Is copper a ferromagnetic material?

Q.

The magnetism acquired by a magnetic material when it is kept near (or in contact with) a magnet, is called _______.

Q.

___ strikes with iron ore to form a permanent magnet.

1. Lightning

2. Neutron

3. Water

4. Bullet

Q.

Draw a labelled diagram to make a soft iron bar as an electromagnet. Describe in steps to make an electromagnet.

Q.

Is ${\mathrm{MgFe}}_2{\mathrm{O}}_4$ ferrimagnetic?

Q.

Which of the below materials uses a permanent magnet?

1. None of the above

2. Pin holder

3. Glass tumbler

4. Screw jack

Q. A bar magnet is brought near an iron nail. Which of the following correctly depicts the polarisation of the nail?

1. 

2. 

3. 

4. None of the above

Q. Name the factors that affect magnetic induction of a magnetic material.

Q. A ________ stuck to a magnet acts like an induced magnet.

1. safety pin
2. copper coin
3. silver chain
4. pencil

Q.

State true or false: Plastic is not a magnetic material.

1. Nickel

2. Plastic

Q.

A magnet can attract wood.

1. False
2. True

Q.

How will you test that 'tea dust' is not adulterated with iron powder?

1. Place a bar magnet near the mixture

2. Heat the mixture

3. Mix it in water

4. Put the mixture under fan

Q.

In which of the following materials a magnet is generally used?

1. Pin holder

2. Plastic toy

3. Car bumper

4. Glass tumbler

Q.

What do you understand by the directive property of magnets?

Q. Define the following
a) dynamo
b) lightning conductor
c) electromagnet
d) induced EMF
e) nuclear reaction

Q.

A temporary magnet has fixed north and south poles.

1. True
2. False

Q.

Why is a magnetic compass used to find direction?

Q.

Magnetic induction occurs when a piece of magnetic material comes near a magnet.

1. True
2. False

Q.

Which of the following statement is/are true

(i) As long as a metal has some iron in it, you can magnetize it using a magnet

(ii) A magnet is an oxide of iron, hence materials which have iron or is an oxide of iron can be made into a temporary magnet.

1. None of these

2. Both (i) and (ii)

3. Only (i)

4. Only (ii)

Q.

___________substances can be strongly magnetized.

1. Dielectric

2. Ferromagnetic

3. Paramagnetic

4. Diamagnetic

Q. Amit has a bar magnet and an iron piece, both of them are of the same size and shape. But, he does not know what is what. Which of the following can be used for distinguishing them?

1. Another magnet
2. A compass

3. A piece thread

4. Iron rod

Q.

Ram wants to make a magnet. Which one of these materials can he not use ?

1. Steel

2. Nickel

3. Cobalt

4. Ebonite

Q.

what is special about the magnetic substances, so that they are attracted by a magnet?

Q.

Which of the following material/materials added to iron gives you Alnico?

1. Contact Screw

2. Striker

3. Gong

4. Electromagnet

Q. The materials which are attracted by a magnet are called

1. magnetic materials
2. non-magnetic materials
3. macroparticle
4. polar substances

Q.

Which of the following is a magnetic substance?

1. Wood

2. Nickel

3. Chinaware

4. Glass

Q.

Which of the following is a magnetic substance?

1. Wood

2. Nickel

3. Glass

4. Chinaware