Basic Science- chapter 7- Attraction and repulsion 545

Multiple Choice

1. Substances attracted by magnet is called

• Compass

• Non magnetic substances

• Magnetic substances

• Copper

​• The substances which are attracted towards a magnet are called magnetic substances.

Multiple Choice

2. Which of the following are magnetic substances?

1. Iron

2. Nickel

3. Cobalt

4. Glass

Select the correct answer using the code given below

• 1 and 2

• 2 and 3

• 1, 2 and 3

• All of the above

​• Magnetic substances are substances that get attracted to magnets. A few of the magnetic substances are iron, steel, cobalt and nickel

Multiple Choice

3. Which one of the following is a non-magnetic substance?

• Pin

• Plastic

• Key

• Blade

​• Non-magnetic materials are plastic, rubber and glass.

Multiple Choice

4. Who invented the magnet?

• Chinese

• Arabs

• Greeks

• None of the above

​• The magnet invented in ancient Greece

Multiple Choice

5. What is the name of a magnet that is obtained from nature?

• Ring magnet

• Bar magnet

• Lodstone

• None of the above

​A Lodestone is a naturally magnetized piece of mineral magnetism. They are naturally occurring magnets.

Multiple Choice

6. A magnetized piece of iron made artificially is called

• Magnetic compass

• Artificial magnet

• Natural magnet

• None of the above

​Artificial magnets are prepared using various processes and with the help of iron.

Multiple Choice

7. Which of the following are used for making magnets?

1. Neodymium

2. Samarium

3. Paper

4. Plastic bottle

Select the correct answer using the code given below

• 1 and 2

• 2 and 3

• 1, 2 and 3

• 1 and 3

​Neodymium and Samarium can be used for making magnet.

Multiple Choice

8. What are the different purposes of magnets?

1. Powerful magnets used for lift objects

2. Magnets are used in generators

3. Magnets are used in medical equipments

4. Used in electronic devises

Which of the statements given above is/are correct?

• 1 and 2

• 2 and 3

• 1, 2 and 3

• All of the above

​Purposes of magnets • Powerful magnets used for lift objects • Magnets are used in generators • Magnets are used in medical equipments • Used in electronic devises

Multiple Choice

9. Which of the following devices that make use of magnets?

1. Speakers

2. Mobile phone

3. Headphone

4. Radio

Select the correct answer using the code given below

• 1 and 2

• 2 and 3

• 1, 2 and 3

• All of the above

​Devices that make use of magnets • Speakers • Mobile phone • Head phone • Radio • Door bells • Refrigerator.

Multiple Choice

10.Consider the following statements.

 

1. the  Poles of same type of magnet is called unlike poles

2. Poles of different  types of magnet is called Liked poles

Which of the statements given above is/are correct?

• 1 only

• 2 only

• Both 1 and 2

• Neither 1 nor 2

​• Poles of the same type of magnets are called Liked poles • Poles of different types of magnets are called unlike poles

Multiple Choice

11. What are the features of magnets?

1. Magnets attract certain substances

2. Magnets are different shapes and size

3. Magnets are seen in different electrical devices

Select the correct answer using the code given below

• 1 and 2

• 2 and 3

• 1, 2 and 3

• 1 and 3

​Features of magnets • Magnets attract certain substances • Magnets are different shapes and size • Magnets are seen in different electrical devices

Multiple Choice

12. Consider the following statements:

1. Hinges and screwdriver are attracted by magnets

2. Copper wire is attracted by magnets.

Which of the statements given above is/are correct?

• 1 only

• 2 only

• Both 1 and 2

• Neither 1 nor 2

​• Hinges and screwdrivers are attracted by magnets • Copper wire is not attracted by magnets

Multiple Choice

13. Which of the following are the different types of magnets?

1. Bar magnets

2. U magnet

3. Disc magnet

4. Cylindrical magnet

Select the correct answer using the code given below

• 1 and 2

• 2 and 3

• 1 and 3

• All of the above

​Different types of magnets • Bar magnets • U shaped magnet • Disc magnet • Cylindrical magnet

Multiple Choice

14. A magnet that emits a magnetic field without the need for any external source of magnetism or electric power is called

• Permanent magnet

• Temporary magnet

• Electromagnet

• Artificial magnet.

​• A magnet that emits a magnetic field without the need for any external source of magnetism or electric power is called permanent magnet.

Multiple Choice

15. Which of the following instruments used for find out direction?

• Magnetic compass

• Anemo meter

• Fathometer

• Hygrometer

​Magnetic compass is an instrument for determining direction on the surface of earth by means of magnetic pointer that aligns itself with the earth’s magnetic field

Multiple Choice

16. Consider the following statements:

1. In the doors of kitchen cabins disc magnets are used.

2. The  U Shaped magnets are  used in scientific experiments

3. Arc magnets are commonly used in motors and generators.

Which of the pair given above is/are correct?

 

• 1 and 2

• 2 and 3

• 1, 2 and 3

• 1 and 2

​• Disc magnets are used in the door of kitchen cabins • U Shaped magnets used in scientific experiments • Arc magnets are commonly used in motors and generators

Multiple Choice

17. Consider the following statements:

1. Cylindrical magnets have only one pole.

2. Magnetic compass used to find out the direction

Which of the statements given above is/are not correct?

• 1 only

• 2 only

• Both 1 and 2

• Neither 1 nor 2

​• Cylindrical magnet is a type of magnet . • A magnet regardless it’s shape, always has two poles. A cylindrical magnet has two poles as well • A Magnetic compass is used find direction.

Multiple Choice

18. Alnico is the alloy of which of the following metals?

1. Aluminium

2. Nickel

3. Cobalt

4. Iron

Select the correct answer using the code given below

• 1 and 2

• 2 and 3

• 1, 2 and 3

• All of the above

​Alnico is a family of iron alloys which in addition to iron are composed primarily of aluminium, nickel, and cobalt

Multiple Choice

19. Consider the following statements:

1. A large magnet is used in loud speakers

2. Nickel is a non-magnetic material

Which of the statements given above is/are correct?

• 1 only

• 2 only

• Both 1 and 2

• Neither 1 nor 2

​• A large magnet is used in loud speakers • Nickel is magnetic material.

Multiple Choice

20. Consider the following statements:

1. Head phone produce low sounds to one person only

2. Because of this head phone use large magnet

Which of the statements given above is/are correct?

• 1 only

• 2 only

• Both 1 and 2

• Neither 1 nor 2

​• Head phone produce low sounds to one person only • Because head phone use small magnet

Multiple Choice

21. Which   speaker would be ideal for addressing a crowd?

• Micro phone

• Loud speaker

• Mini speaker

• None of the above

​Loud speaker can be used to address large crowd.

Multiple Choice

22. Consider the following statements:

1. The shape and size of the magnets differ according to the device in which they used

2.  A magnet in the shape a bar with poles at its ends called bar magnet.

Which of the statements given above is/are correct?

• 1 only

• 2 only

• Both 1 and 2

• Neither 1 nor 2

​• Magnets come in any different shapes and sizes. The shape of a magnet reflects the individual strength of each magnet. • A magnet in the shape of a bar with poles at its ends is called bar magnets

Multiple Choice

23. The end portion of a magnet where magnetic force is strongly felt is

• Middle of the magnets

• Magnetic poles

• Magnetic substances

• Between middle and poles of magnet

​The end portion of a magnet where magnetic force is strongly felt is Magnetic poles

Multiple Choice

24. Consider the following statements:

1. Permanent magnets are usually made up of soft iron

2. A magnet has always 3 poles.

Which of the statements given above is/are not correct?

• 1 only

• 2 only

• Both 1 and 2

• Neither 1 nor 2

​• A magnet has always 2 poles. • Permanent magnets usually made of hard materials.

Multiple Choice

25. When do we make use of north-south directive property of magnets?

1.  Helps the Ships to find the direction

2. To know the direction inside the forests

3. To know direction when building a house

Select the correct answer using the code given below

• 1 and 2

• 2 and 3

• 1, 2 and 3

• 1 and 3

​Uses of north-south directive property of magnets • Helps to Ships to find the direction • To know the direction inside the forests • To know direction when building a house

Multiple Choice

26. Consider the following statements:

1. When a magnet is suspended freely in air with the help of a thread then it tends to align itself in the geographic north and south direction

2. The directive property of magnet is used in the construction of a compass.

Which of the statements given above is/are correct?

• 1 only

• 2 only

• Both 1 and 2

• Neither 1 nor 2

​When a magnet is suspended freely in air with the help of a thread then it tends to align itself in the geographic north and south direction

Multiple Choice

27. What happens when two north poles of magnet are placed together?

• Increase the strength of the magnet

• They attract

• They repel

• None of the above

​• When two north poles of magnet are placed together the magnets are repel each other

Multiple Choice

28. Consider the following statements:

1. Like poles of two magnets repel each other

2. Opposit poles of two magnets attracts each other

 

Which of the statements given above is/are correct?

• 1 only

• 2 only

• Both 1 and 2

• Neither 1 nor 2

​• Like poles of two magnets repel each other • Opposite poles of two magnets attracts each other

Multiple Choice

29.A magnet is one that is built in the shape of horseshoe is called

• Disc shaped magnet

• U shaped magnet

• Bar magnet

• Cylindrical magnet

​A magnet is one that is built in the shape of horseshoe is called U shaped magnet.

Multiple Choice

30. Which of the following is a natural magnet?

• Horse shoe magnet

• Bar magnet

• Magnetite

• Ring magnet

​Magnetite is a natural magnet. Others are artificial magnets