Fun With Magnet: science class six
NCERT Exercise Solution
Figure1 Field Lines of magnet
Fun With Magnet Class six NCERT Exercise Question (1) Fill in the blanks in the following
(i) Artificial magnets are made in different shapes such as ______, ______ and ______.
Answer Artificial magnets are made in different shapes such as bar magnet and spherical magnet.
(ii) The materials which are attracted towards a magnet are called ______.
Answer The materials which are attracted towards a magnet are called Magnetic Materials.
(iii) Paper is not a _______ material.
Answer Paper is not a Magnetic material.
(iv) In olden days, sailors used to find direction by suspending a piece of ________.
Answer In olden days, sailors used to find direction by suspending a piece of Magnet.
(v) A magnet always has ______ poles.
Answer A magnet always has two poles.
Fun With Magnet Class six NCERT Exercise Question (2) State whether the following statements are true or false:
(i) A cylindrical magnet has only one pole.
Answer False
Correct statement A cylindrical magnet has two poles.
Explanation A magnet has always two poles.
(ii) Artificial magnets were discovered in Greece.
Answer False
Correct Answer Natural magnets were discovered in Greece. And artificial magnet was discovered in England. William Sturgeon, an English Physicist is the inventor of first electromagnet. Electromagnet is called artificial magnet.
(iii) Similar poles of a magnet repel each other.
Answer True
Explanation : A magnet has two poles, south pole and north pole. South pole of a magnet repels south pole of other magnet and north pole of a magnet attracts south pole of other magnet.
(iv) Maximum iron fillings stick in the middle of a bar magnet when it is brought near them.
Answer False
Correct Statement : Maximum iron fillings stick at the poles of a bar magnet when it is brought near them. This happens because a magnet is stronger at its poles.
(v) Bar magnets always point towards North-South direction.
Answer True
Explanation: When a bar magnet is suspended freely, its north pole directs towards north direction and south pole directs towards south direction. This is the cause that a bar magnet is used to find direction since ancient times.
(vi) A compass can be used to find East-West direction at any place.
Answer True
Explanation A compass contains a magnet in the shape of needle which can rotate freely. And when a magnet is suspended freely, its north pole directs towards north and south pole directs towards south direction.
Thus, by knowing the north and south direction, one can easily find the other two directions, i.e. East and West directions.
However, in a compass all directions are written to facilitate finding the directions easily.
(vii) Rubber is a magnetic material.
Answer False
Correct Answer A rubber is a non-magnetic material.
Explanation Materials which are attracted towards a magnet are called magnetic materials while those which are not attracted towards a magnet are called non-magnetic materials. Rubber is not attracted towards magnet, and hence is a non-magnetic material. It can be said more accurately, that materials which are not attracted towards a magnet are called non-magnetic materials.
Fun With Magnet Class six Science NCERT Exercise Question (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 used to make some part of it.
Answer : Iron or steel is used in making of blade of a sharpner.
Explanation
In a pencil sharpener usually body is made of plastic while blade is made of steel or iron. This blade is necessary to sharp the pencil.
Since blade is made of steel, and magnet is not used in blade, because of this pencil sharpener gets attracted by both the pole of a magnet.
If the blade of a pencil sharpener would be a magnet, then only this will not be attracted by both of the poles. However, even if blade is made of magnet, consequently that has two poles, then one side of pencil sharpener would be attracted by one pole while other end of the sharpener would be attracted by other pole of a magnet.
Fun With Magnet Class six Science NCERT Exercise Question (4) Column I shows different positions in which one pole of a magnet is placed near that of the other. Column II indicates the resulting action between them for each situation. Fill in the blanks.
| Question Table | |
|---|---|
| Column I | Column II |
| N – N | ______ |
| N – _____ | Attraction |
| S – N | ______ |
| _____ – S | Repulsion |
Answer
| Answer Table | |
|---|---|
| Column I | Column II |
| N – N | Repulsion |
| N – S | Attraction |
| S – N | Attraction |
| N – S | Repulsion |
Fun With Magnet Class six Science NCERT Exercise Question (5) Write any two properties of a magnet.
Answer
(a) A magnet attracts magnetic materials, such as articles made of iron.
(b) A magnet when suspended freely, its north pole directs towards north direction while south pole directs towards south direction.
Fun With Magnet Class six Science NCERT Exercise Question (6) Where are poles of a bar magnet located?
Answer
The poles of a bar magnet are located at their ends. One pole is at one end while other pole is at another end.
Fun With Magnet Class six Science NCERT Exercise Question (7) A bar magnet has no markings to indicate its poles. How would you find out near which end is its north pole located?
Answer
When a magnet is suspended freely, its north pole directs towards north direction and south pole directs towards south direction.
Thus, after suspending the given magnet freely using a thread, end that indicates the north direction, is its north pole.
Fun With Magnet Class six Science NCERT Exercise Question (8) You are given an iron strip. How will you make it into a magnet?
Answer
A iron strip can be turned into a magnet by rubbing a magnet over it into a certain fashion.
Steps to turn the given strip into a magnet:
(a) The given iron strip has been placed on table.
(b) Now a bar magnet has been taken.
(c) This bar magnet has been started rubbing over the iron strip in one direction only after holding the given iron strip using one hand.
(d) The rubbing of bar magnet over given iron strip has been repeated many times i.e. 20 to 30 times.
(e) The iron strip has been checked for getting magnetic property. If iron strip does not attract the iron nails, then rubbing of magnet over it is repeated for 10 more times.
This will turn the iron strip into magnet.
Figure2: Making of a magnet
Fun With Magnet Class six Science NCERT Exercise Question (9) How is a compass used to find directions?
Answer
A compass has needle shaped bar magnet pivoted over a nail. And north and south poles are indicated over the magnetic needle of compass.
Thus, direction in which north pole of a compass directs, is the north direction. And direction towards which south pole of the compass indicates is the south direction.
And, right of the north direction is the east and left of the north direction is the west direction at 900 angle.
Thus, by using a compass all directions can be found easily.
Fun With Magnet Class six Science NCERT Exercise Question (10) A magnet was brought from different directions towards a toy boat that has been floating in water in a tub. Affect observed in each case is stated in the Column I. Possible reasons for the observed affects are mentioned in Column II. Match the statements given in Column I with those in Column II.
| Question Table | |
|---|---|
| Column I | Column II |
| Boat gets attracted towards the magnet | Boat is fitted with a magnet with north pole towards its head. |
| Boat is not affected by the magnet | Boat is fitted with a magnet with south pole towards its head |
| Boat moves towards the magnet if 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 north pole is brought near its head | Boat is made of magnetic material |
| Boat floats without changing its direction. | Boat is made up of non-magnetic material. |
Answer
| Answer Table | |
|---|---|
| Column I | Column II |
| Boat gets attracted towards the magnet | Boat is made of magnetic material |
| Boat is not affected by the magnet | Boat is made up of non-magnetic material. |
| Boat moves towards the magnet if north pole of the magnet is brought near its head | Boat is fitted with a magnet with south pole towards its head. |
| Boat moves away from the magnet when north pole is brought near its head | Boat is fitted with a magnet with north pole towards its head. |
| Boat floats without changing its direction. | Boat has a small magnet fixed along its length. |
Reference:
Figure1: By Geek3 - Own work, CC BY-SA 4.0, Link
Figure2: Fun With magnet, NCERT Book, class 6 science, page number: 131