Chapter - 13
Fun with Magnets
NCERT MP Board Class 6 Science Chapter 13 Fun with Magnets
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NCERT MP Board Class 6 Science Chapter 13 Fun with Magnets
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NCERT MP Board Class 6 Science Chapter 13 Fun with Magnets
Solutions
Q.1. Fill in the blanks in the following:
(i) Artificial Magnets are made in different shapes such as............ , .............and ..........
(ii) The materials which are attracted towards a magnet are called .............. .
(iii) Paper is not a ...........material.
(iv) In olden days , sailors used to find direction by suspending piece of .............. .
(v) A magnet always has ............... poles.
Ans.
(i) bar magnet, horse-shoe magnet, cylindrical;
(ii) magnetic material;
(iii) plastic;
(iv) suspended magnet;
(v) two.
Q.2. State whether the following statements are True (T) or False (F):
(i) A cylindrical magnet has only one pole .
(ii) Artificial Magnets were discovered in Greece.
(iii) Similar poles of magnet repel each other.
(iv) Maximum iron filing stick in the middle of a bar magnet when it is brought near them .
(v) Bar Magnets always point towards North -South direction.
(vi)A compass can be used to find East - West direction at any place.
(vii) Rubber is a magnetic material.
Ans.
(i) False;
(ii) False;
(iii) True;
(iv) False;
(v) True;
(vi) False;
(vii) False.
Q.3. It was observed that a pencil sharpener gets attracted by both the poles of a magnet although it's body is made of plastic. Name a material that might have been used to make some part of it.
Ans. Iron.
Q.4. Column I shows different position 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.
Ans.
Q.5. Write any two properties of a magnet.
Ans. The properties of a magnet are:
(i) It attracts the objects made iron, cobalt and nickle.
(ii) When it is suspended freely then it stands always in North-South direction.
Q.6. Where are poles of a bar magnet located?
Ans. On the two ends of the bar magnet.
Q.7. A bar magnet has no marketing to indicate it's poles. How would you find out near which end is its North pole located?
Ans. Take a bar magnet. Put a mark on one of its ends for identification. Now, tie a thread at the middle of the magnet so that you may suspend it from a wooden stand [Fig.]. Make sure that the magnet can rotate freely. Let it come to rest. Mark two points on the ground to show the position of the ends of the magnet when it comes to rest. Draw a line joining the two points. This line shows the direction in which the magnet was pointing in its position of rest. Now, rotate the magnet by gently pushing one end in any direction and let it come to rest. Again, mark the position of the two ends in its position of rest. Rotate the magnet in other directions and note the final direction in which it comes to rest.
We find that a freely suspended bar magnet always comes to rest in a North-South direction. The end of the magnet that points towards North is called its North seeking end or the North pole of the magnet.
Q.8. You are given an iron strip. How will make into a magnet?
Ans. Take the iron stripe and place it on the table. Now take a bar magnet and place one of it poles near one edge of the bar of iron. Without lifting the bat magnet, move it along the length of the iron bar till you reach the other end. Now, lift the magnet and bring the pole (the same pole you started with ) to the same point of the iron bar from which you began (fig.) Move the magnet again along the iron bar in the same direction as you did before. Repeat this process about 30-40 times. Bring a pin or some iron filing near the iron bar to check whether it has become magnet. If not, continue the process for some more time. ( Remember that the pole of the magnet and the direction of its movement should not change). In this way, an iron strip can be converted into magnet.
Q.9. How is a compass used to find directions?
Ans. Magnetic compass. Magnetic compass consists of a small magnetized needle which is enclosed in a small round box made of aluminium. The box consists of a small pointed vertical axis (pivot) on which the magnetized needle rotates freely. The aluminium box is covered by the thin glass cover.
The magnetic needle rotates freely and points towards geographic North from which true north can be calculated. This magnetic compass is used to find the direction at any place. Sailors and navigators also use this compass to find the direction during their journey.
Q.10. A magnetic 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 Column I. Possible reasons for the observed affect are mentioned in Column II. Match the statements given in Column I with those in Column Il.
Ans.
Ans. (i) (d); (ii) (e); (iii) (b); (iv) (a); (v) (b);