Magnetisation

Q.

Which of the following is NOT a magnetic material?

1. Cobalt

2. Iron

3. Plastic

4. Nickel

Q.

Materials that are not attracted by magnet are called ___

Q.

Rubber is a magnetic material. (True or False)

1. True
2. False

Q.

Which of the following metals are magnetic in nature?

1. Aluminium, copper

2. Cobalt, nickel, iron, steel

3. Copper, lead, brass, zinc

4. Iron, aluminium, zinc, lead

Q.

Magnetic material that can be strongly magnetized are known as ______ substances.

1. ferromagnetic

2. paramagnetic

3. diamagnetic

4. dielectric

Q.

What happens when a ferromagnetic substance is heated to a high temperature?

Q. Write functions of metal detector.

Q.

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

1. Heating it

2. Dropping it repeatedly

3. Coating it with oil

4. Hitting it

Q.

Write the name of two magnetic and non-magnetic materials.

Q.

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

Q.

Magnetization by single touch or double touch method creates ___ magnet.

Q.

Question 1 (iii)

Fill in the blank in the following.
Paper is not a ___ material.

Q.

Question 1 (ii)

Fill in the blank in the following.

The Materials which are attracted towards a magnet are called ___.

Q.

1. Classify the following substances into magnetic and non-magnetic substances:

copper, brass, iron, nickel, silvery zinc, cobalt, and alnico

Q.

Question 2 (vii)

State whether the following statement is true or false.

Rubber is a magnetic material.

Q.

The ways to magnetize a material are

1. Single touch method

2. All of the above

3. Double touch method

4. Electrical method

Q. Do you think an electromagnet can be used for separating plastic bags from a garbage heap? Explain.

Q.

"As long as a metal has some iron in it, you can magnetize it using another magnetic metal or an electromagnet".The given statement is

1. True

2. False

Q.

Which of the following statements is correct?

1. By rubbing a magnet over it for few minutes.

2. Can't be converted.

3. By keeping it in a hot glass of water.

4. By hammering it.

Q. Whenstrikes at a piece of iron ore, a permanent magnet is formed.

1. lightning
2. bar magnet
3. horse shoe magnet

Q.

Define magnetic and non-magnetic material.

Q.

Which of the following is a magnetic substance?

1. Nickel

2. Chinaware

3. Wood

4. Glass

Q.

Ram wants to make a magnet. Which of the following materials he cannot make use of?

1. Steel

2. Nickel

3. Cobalt

4. Ebonite

Q. Which of the following cannot be used to make a magnet?

1. Cobalt
2. Iron
3. Ebonite
4. Steel

Q.

Which one of the following activity will not affect the strength of a magnet?

1. Heating

2. Radiation

3. Other magnets in close proximity to the magnet

4. Painting

Q. Magnetite is a/an ______.

1. electromagnet
2. non-magnetic substance
3. natural magnet
4. artificial magnet