NCERT Solutions Class 6 Science Chapter 13 Fun with Magnets

NCERT Solutions for Class 6 Science for chapter 13 Science Fun with Magnets

1. Fill in the blanks:

(i) Artificial magnets are made in different shapes such as ______, _________, and __________.

(ii) The materials which are attracted towards magnets are called ________.

(iii) Paper is not a ________material.

(iv) In olden days, sailors used to find direction by suspending a piece of _ ______.

(iv) A magnet always has ______ poles.

Answer:

(i) Artificial magnets are made in different shapes such as bar magnets, horse-shoe magnets, and cylindrical magnets.

(ii) Materials which are attracted towards magnets are called magnetic materials.

(iii) Paper is not a magnetic material.

(iv) In olden days, sailors used to find direction by suspending a piece of bar magnet.

Explanation: The sailors used to find direction by suspending a piece of bar magnet because a freely suspended magnet always comes to rest in the North-South direction.

(v) A magnet always has two poles.

Explanation: A magnet consists two poles namely the South pole (S) and the North pole (N).

2. State whether the following statements are

‘True’ or ‘False’.

(i) A cylindrical magnet has only one pole.

(ii) Artificial magnets were discovered in Greece.

(iii) Similar poles of a magnet repel each other.

(iv) Maximum iron filings stick in the middle of a bar magnet when it is bought near them.

(v) Bar magnets always point towards the North−South direction.

(vi) A compass can be used to find the East−West direction at any place.

(vii) Rubber is a magnetic material.

Answer:

(i) A cylindrical magnet has only one pole.

(False)

Explanation: A magnet cannot exist with a single pole. A magnet always exists with two poles. Hence, a cylindrical magnet has also two poles.

(ii) Artificial magnets were discovered in Greece.

(False)

(iii) Similar poles of a magnet repel each other.

(True)

Explanation: Like poles of magnets repel each other, while unlike poles of magnets attract each other.

(iv) Maximum iron filings stick in the middle of a bar magnet when it is bought near them.

(False)

Explanation: The magnetic strength of a bar magnet is maximum at its two poles and minimum at middle. Hence, maximum iron filings will stick at

two ends of the magnet and minimum in the middle.

(v) Bar magnets always point towards the North−South direction.

(True)

(vi) A compass can be used to find the East−West direction at any place.

(True)

Explanation: We know that a magnetic compass always points towards the North−South direction. If the North−South direction is known, then the East−West direction can be found.

(vii) Rubber is a magnetic material.

(False)

Explanation: Rubber is a non-magnetic material as it is not attracted by a magnet.

 

3. It was observed that a pencil sharpener gets attracted by both the poles of a magnet, although its body is made of plastic. Name a material that might have been used to make some part of it.

Answer: In a pencil sharpener, the blade is made of iron and iron is a magnetic material. Magnets have tendency to attract the objects made of iron. Hence, a pencil sharpener gets

attracted towards both the poles of a magnet.

 

4. Column I shows different positions in which one pole of a magnet is placed near the other. Column II indicates the resulting

action between them for each situation.

Fill in the blanks.

Column I	Column II
N-N
N- __________	Attraction
S-N
___________  - S	Repulsion

Answer:

Column I	Column II
N-N	Repulsion
N - S	Attraction
S-N	Attraction
S - S	Repulsion

5. Write any two properties of a magnet.

Answer: Two properties of a magnet are:

(i) Unlike poles of two magnets attract each other.

(ii) Like poles of two magnets repel each other.
 

6. Where are the poles of a bar magnet located?
 

Answer: There are two poles of a magnet namely North pole and South pole. They are located at the two ends of the magnet.

7. A bar magnet has no markings to indicate its poles. How can you find out the location of the North pole?

Answer: The poles of a bar magnet with no marking can be identified by suspending the bar magnet freely with the help of a light thread. A freely suspended bar magnet always comes to rest in the North−South direction. The north facing end of the magnet indicates its north pole while the south facing end indicates its south pole.

8. You are given an iron stri How will you make it into a magnet?

Answer: To convert an iron strip into a magnet, place the iron strip on the table. Now, rub a permanent magnet on the strip. While doing this, the movement of your hand should always be in the same direction. After doing this 40–50 times, the iron piece would attain magnetic properties.

9. How is a compass used to find directions?

Answer: A compass has a magnetic needle which can move around a pivot. As a magnet always stays in north-south direction hence, this property of magnet is used to find the directions with the help of a compass.

10. A magnet was brought from different directions towards a toy boat that has been
 

floating on water in a tub. The effect observed in each case is stated in Column I. Possible reasons for the observed effects are mentioned in Column II. Match the statements given in Column I with those in Column II.

Column I	Coulmn II
Boat gets attracted towards the magnet	Boat is fitted with a magnet with the north pole towards its head
Boat is not affected by the magnet	Boat is fitted with a magnet with the south pole towards its head
Boat moves towards the magnet when the north pole of the magnet is brought near its head	Boat has a small magnet fixed along its length
Boat moves away from the magnet when the north pole is brought near its head	Boat is made of magnetic material
Boat floats without changing its direction	Boat is made of a non-magnetic material

Answer:

Column I

Coulmn II

Boat gets attracted towards the magnet	Boat is made of magnetic material
Boat is not affected by the magnet	Boat is made of a non- magnetic material
Boat moves towards the magnet when the north pole of the magnet is brought near its head	Boat is fitted with a magnet with the south pole towards its head
Boat moves away from the magnet when the north pole is brought near its head	Boat is fitted with a magnet with the north pole towards its head
Boat floats without changing its direction	Boat has a small magnet fixed along its length