General Science 6th Class Chapter 10 Magnetism Solved Exercise

General Science

6th Class

Chapter 10

Magnetism

Questions

10.1 Encircle the correct option.

1. A magnet can attract objects made of

a. copper        b. iron        c. aluminum        d. silver

2. The ends of a magnet are called its

a. sides        b. heads        c. terminals        d. poles

3. A freely suspended bar magnet always stays along

a. east-west direction        b. north-south direction

c. any direction        d. keeps oscillating

4. Magnet is used in

a. a dynamo        b. an electric bell        c. a speaker        d. a heater

5. Which one is the true statement

a. North pole attracts north pole        b. North pole repels north pole

c. South pole repels north pole        d. South pole attracts south pole

6. To increase the strength of an electromagnet, we can:

a. change the direction of the current        b. insert a wooden core inside a coil

c. increase the amount of current flowing        d. decrease the amount of current flowing

7. The space around a magnet where it can attract magnetic materials:

a. electric field        b. magnetic field        c. magnetic pole        d. magnetic core

8. Which will not cause a magnet lose its magnetism?

a. heating it        b. dropping it repeatedly

c. coating it with oil        d. hitting it

9. Which will not increase the strength of an electromagnet?

a. adding an iron core        b. adding a plastic core

c. coiling the wire        d. increasing the current

10.2 Write short answers.

1. What is a magnet?

Ans.

A material or object that can attract the objects made of iron, nickel and cobalt is called magnet.

2. What is the difference between a permanent magnet and temporary magnet?

Ans.

Permanent magnet:

The magnets which don't lose their magnetic property easily are called permanent magnets. Naturally occurring magnets, e.g. load stone are permanent magnets.

Temporary magnet:

The objects such as iron or steel pieces are magnetized and converted into magnet in the presence of magnetic field or by rubbing permanent magnet on them. Such magnets are called temporary magnets.

3. Write strokes method of making a magnet.

Ans.

• Take a bar magnet and an iron nail.
• Rub or stroke the bar magnet on the iron nail many times in the same direction.
• The iron nail will become temporary magnet.
• Check it by bringing near paper clips or common pins.

4. Define magnetic field.

Ans.

A magnet exerts a force on an object (magnetic material) which is brought close to it. The region around a magnet where it can attract magnetic material is called magnetic field.

5. Write names of five things which are made of magnetic material.

Ans.

• Electric bell
• Speaker
• Dynamo
• Electromagnetic crane
• Credit and debit cards