# NCERT Exemplar Class 6 Science Fun with Magnets

NCERT Exemplar Solution Class 6 Science Chapter 13 Fun with Magnets Full Explanation. NCERT Exemplar Class 6 Science – Chapter 13 Fun with Magnets. NCERT Exemplar Class 6 Science Fun with Magnets Solution by Expert Teacher.

## NCERT Exemplar Class 6 Science Fun with Magnets Solution

• Multiple Choice Questions

1) Observe the pictures A and B given in

Which of the following statement is correct for the above given pictures?
a) In A, cars 1 and 2 will come closer and in B, cars 3 and 4 will come closer.
b) In A, cars 1 and 2 will move away form each other and in B, cars 3 and 4 will move away.
c) In A, cars 1 and 2 will move away and in B , 3 and 4 will come closer to each other.
d) In A, cars 1 and 2 will come closer to each other and in B, 3 and 4 will move away from each other.

Answer:- d) In A, cars 1 and 2 will come closer to each other and in B , 3 and 4 will move away from each other. According to the property of magnet, Unlike attracts each other and like repelled each other.

2) The Arrangement to store two magnets is shown by figures (a) , (b), (c), and (d) in fig. 13.2 which one of them is the correct arrangement?

Answer:-b)The arrangement shown in the figure B is correct.

3) Three magnets A, B, and C were dipped one by one in a heap of iron filing fig. 13.3 shows the amount of the iron filing sticking to them.

The strength of these magnets will be

a) A>B>C

b) A<B<C

c) A=B=C

d) A<B>C

According to given figure, the strength of the magnets will be A is stronger than B is stronger than C.

4) North pole of a magnet can be identified by

a) Another magnet having its pole marked as north pole and south pole.

b) Another magnet no matter whether the poles are marked or not.

c) Using an iron bar.

d) Using iron filings.

Answer:-a) Another magnet having its pole marked as north pole and south pole.

Magnet has the attraction and repulsion properties, opposite poles attract each other thus we can find that.

5) A bar magnet is immersed in a heap of iron filings and pulled out. The amount of iron filing clinging to the

a) North pole is almost equal to the south pole.

b) North pole is much more than the south pole.

c) North pole is much less than the south pole.

d) Magnet will be same all along its length.

Answer:-a) North pole is almost equal to the South pole.

Both poles of the magnet has almost same power.

6) Fill in the blanks

i) When a bar magnet is broken; each of the broken part will have __________ pole/ poles.

Answer:- When a bar magnet is broken; each of the broken part will have two poles.

ii) In a bar magnet, magnetic attraction is ____________ near it’s ends.

Answer:- In a bar magnet, magnetic attraction is more near it’s ends.

7) Paheli and her friends were decorating the class bulletin board. She dropped the box of stainless steel pins by mistake. She tried to collect the pins using a magnet she could not succeed. What could be the reason for this ?

Answer:- Magnet attracts the iron and iron sticks to it, as iron is magnetic substance.But stainless steel pins cannot stick to magnet, because stainless steel is non-magnetic material. Therefore she could not collect the pins using a magnet.

8) How will you test that ‘tea dust’ is not adulterated with iron powder ?

Answer:- We can test whether iron powder is added to tea dust or not by using a magnet.

Magnet attracts the magnetic substances only. Iron is a magnetic material but tea dust is not. Thus the iron powder will be attached to the magnet if it is added to the tea powder or not.

9) Boojho dipped a bar magnet in a heap of iron filings and pulled it out. He found that iron filings got stuck to the magnet as shown in fig. 13.4.

i) Which regions of the magnet have more iron filings sticking to it?

As shown in fig. Maximum iron filings are attracted towards the close to two ends of the magnet.

ii) what are these regions called?

Answer:- The two ends where the iron fillings attract more is known as poles of magnet.

10) Four identical iron has bars were dipped in a heap of iron filings one by one. Fig. 13.5 shows the amount of iron filings sticking to each of them.

a) Which of the iron bar us likely to be the strongest magnet?

Answer:-  as per the figure, A is likely to be the strongest magnet.

Because it attracted the more Iron filings than the magnet B, C and D. It has more capacity of attracting the iron filings than the other. Therefore it is likely to be strongest magnet.

b) Which of the iron bars is not a magnet? Justify your answer.

Answer:- B is not the magnet. As there are no iron filings attached to it. Magnet attracts the magnetic substances but B doesn’t attracted Iron filings therefore it is not a iron bar magnet.

11) A toy car has a bar magnet laid hidden inside it’s body its length. Using another magnet how will you find out which pole of the magnet is facing the front of the car?

Magnet has the attraction and repulsion properties. By using these two properties we can find out which pole of magnet is facing front of the car.

Magnet has property that opposite poles attract each other and similar magnet repelled each other.

By using the property, we can perform an activity to identify it.

we take the north pole of an iron bar magnet close to the front of the car and if it attracted towards it then the front of the car has south pole, and if it is repelled then the front of the car has north pole.

12) Match column I with column II ( one option of A can match with more than one option of B)

 Column I Column II a)          Magnet attracts i)   Rests along particular direction b)          Magnet can be repelled ii)  Iron c)           Magnet if suspended freely iii)  By another magnet d)  Poles of the magnet can be identified by iv)  Iron filings

A)Magnet attracts → ii) Iron

B) magnet can be repelled → By another magnet

C) magnet is suspended Freely → Rests along particular Direction

D) poles of the magnet Can be identified by → By another magnet

13) You are provided with two identical metal bars. One out of the two is a magnet. Suggest two ways to identify the magnet .

We can identify whether the metal bars are magnet or not,

1) Attracting iron filings-

Spread some Iron filings and Move the metal bars over it. the Iron filings will attach to which metal bar it  is a magnet. And the iron filings will not attached to one metal bar it is not magnet.

2) Using another magnet –

Magnet has property to attract and repelled by another magnet.

Which metal bars will be attracted towards the magnet then it is a magnet. And if it is not attracted towards the another magnet then it is not a magnet.

Therefore by using these methods we can find out which metal bar is a magnet and which is not.

14) Three identical iron bars are kept on a table . Two out of three bars are magnets. In one of the magnet the North- south poles are marked. How will you find out which of the other two bars is a magnet ? Identify the poles of this magnet.

Answer:- The magnet which is marked with the south and north pole will attract or repelled the other metal bar which is a magnet. And it will not attract or repelled to the metal bar which is not magnet. This is the test of repulsion of magnet. The magnet has property to attract or repelled by another magnet. We will use here that. Thus it will be clear by using this method that which one of the metal bars is a magnet and which is not.

15) Describe the steps involved in magnetising an iron strip with the help of a magnet.

1) Take a bar magnet , hold it on the edge and rub another edge of that bar magnet on the iron strip.

2) From one end of the iron strip to the another end of the strip without lifting the magnet.

3) As soon as you reach the end of the iron bar lift the magnet and again place it to the starting point.

4) Move the magnet again as before.

5) Repeat the same process 30-40 times.

6) After that bring a iron pin near the iron bar and see whether the bar is become magnet or not.

7) If not then repeat the process again.

8) One precaution is that do not change the pole of the magnet and direction of the movement of the magnet along the iron bar.

The process should be done as shown in following picture.

16) Fig. 13.6 shows a magnetic compass. What will happen to the position of its needle if you bring a bar magnet near it ? Draw a diagram to show the effect of needle on bringing magnet near it. Also draw the diagram to show the effect when the other end of the bar magnet us brought near it.

The magnetic needle of the given compass will be deflected as shown in following figure when the magnet is place near it.

17) Suggest an activity to prepare a magnetic compass by using an iron needle and a bar magnet.

We can prepare an magnetic compass by using an iron needle and a bar magnet. Magnetise the iron needle with given magnet, and insert that magnetise needle in the cork. Let the needle and cork float on water in the bowl. But don’t let the needle touch the water. Now the compass is ready. Now rotate the cork with needle, in different directions. The needle will stop after some time showing the north direction.

18) Boojho kept a magnet close to an ordinary iron bar. He observed that the iron bar attracts a pin as shown in fig. 13.7.

What inference could he draw from this observation? Explain.

Answer:- When the magnet is attached to the iron bar , then the magnetic properties of the magnet are induced into the iron bar. And thus the iron bar acts like a magnet and attract the iron nail near it.

19) A bar magnet is cut into two pieces A and B, from the middle as shown in fig. 13.8

Will the two pieces act as individual magnets? Mark the poles of these two pieces. Suggest an activity to verify your answer.

Answer:- Yes, the two pieces acts as an individual magnets when break from middle. We can identify that they are working individual or not by using an test of repulsion.

We can take one piece of them and keep it near to the other piece if it attracted or repelled by the another piece then it is acting like an magnet. Hence it will be proved.

20) Suggest an arrangement to store a U shaped magnet. How is this different from storing a pair of bar magnet.