Magnetic and Non Magnetic Material

Q.

How can magnets lose their properties?

1. If they are heated

2. If they are hammered

3. If they are dropped from height

4. All of these

Q.

Which the following will be attracted to a magnet? [2 MARKS]

Rubber, iron nails, steel pen, wood, cobalt, plastic, nickel

Q.

Steel is a non-magnetic substance.

1. True
2. False

Q. Identify the types of magnet.

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

Q. Which of the following action(s) will result in the loss of magnetism of a magnet?

1. By immersing a magnet in water at room temperature.
2. Hammering
3. Heating
4. Throwing

Q.

Which of the following gets attracted to a magnet?

1. Silver spoon

2. Comb

3. Pins

4. Paper

Q. Justify: Repulsion is the surest test for magnetism.

Q.

____________is a device which was used by pilots and navigators to find the direction.

1. Radar

2. Thermometer

3. Sonar

4. Magnetic compass

Q. How will you test if a given substance is magnet or not?

Q.

Answer the following:

How a magnet loses its magnetism property?

Q.

Which of the following activities will result in the loss of magnetic properties?

1. By immersing a magnet in water at room temperature.

2. Heating

3. Hammering

4. Keeping a magnet idle for a long time

Q. Describe "range of attraction" and "power of attraction" for magnets. [3 MARKS]

Q.

Asmita took two magnets and a steel paperclip. Magnet A can attract a steel paperclip from 10 cm away. Magnet B can attract a steel paper clip only up to 7 cm far away from the magnet. Which magnet is stronger?

1. magnet A

2. they are equally strong

3. magnets wouldn't attract steel paperclips

4. magnet B

Q.

Can a magnet be de-magnetized

Q. What is magnet?

Q. How do magnets interact with a magnetic material?

1. It doesn't interact with the material.
2. It repels the material.
3. It attracts the material.
4. Depends on the conditions.

Q. gets attracted to a magnet.

1. Iron
2. Gold
3. Wood

Q.

The figure shows a bar magnet and two large pins hung from its north pole. Explain why these two pins repel each other?

Q.

Diamagnetic substances are __ by strong magnets.

Q.

Why do like poles repel and unlike poles attract? Why cant like poles attract?

Q. Three identical iron bars A, B and C are kept on a table, out of which two bars are magnet. Bar B is a magnet whose north-south poles are marked. How will you find out which one of the remaining two bars is a magnet?

1. By checking attraction between magnet and iron bar.
2. By checking repulsion between iron bar and magnet.
3. By heating the bar magnet and iron bar together.
4. By bending the iron bar.

Q. Three identical iron bars are kept on a table. Two out of three bars are magnets. In one of the magnets the North-South poles are marked. How will you find out which of the other two bars is a magnet? Identify the poles of this magnet.

Q. A bar magnet is split into three pieces. How many poles in total will exist now?

1. Two
2. Four
3. Six
4. Three

Q. Any object can be made a magnet if it is brought near or in contact with a very strong magnet.

1. True
2. False

Q. An iron metal bar cannot be converted to a magnet.

Q.

Choose the correct match

A. Ferromagnetic	(a) water
B. Diamagnetic	(b) cobalt
C. Paramagnetic	(c) chromium

1. A-b, B-c, C-a

2. A-c, B-a, C-b

3. A-b, B-a, C-c

4. A-a, B-a, C-b

Q.

A magnet has no effect even if it is heated to a very high temperature.

1. True
2. False

Q. All metals are magnetic materials.

1. False
2. True

Q. Magnetic force is a contact force.

1. False
2. True

Q. Select the magnetic materials from the following.

1. Iron key
2. Iron needle
3. Gold bar
4. Copper coin
5. Nickel scissors
6. Aluminium foil
7. Steel rod
8. Cobalt button