NCERT Exemplar Class 6 Science Chapter 13 Fun with Magnets are part of NCERT Exemplar Class 6 Science. Here we have given NCERT Exemplar Class 6 Science Solutions Chapter 13 Fun with Magnets.

## NCERT Exemplar Class 6 Science Solutions Chapter 13 Fun with Magnets

Multiple Choice Questions

Question 1.
Observe the pictures A and 8 given in figure carefully.

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 from each other and in B, cars 3 and 4 will move away.
(c) In A, cars 1 and 2 will move away and in 8,3 and 4 will come closer to each other.
(d) In A, cars 1 and 2 will come closer to each other and in 8,3 and 4 will move away from each other.
Solution:
(d) Unlike poles attract each other while like poles repel each other.

Question 2.
The arrangement to store two magnets is shown by figures (a), (b), (c) and (d). Which one of them is the correct arrangement?

Solution:
(b)

Question  3.
Three magnets A, B and C were dipped one by one in a heap of iron filing. Figure 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
Solution:
(a): The amount of the iron filing sticking to magnets is directly proportional to their strengths.

Question 4.
North pole of a magnet can be identified by
(a) Another magnet having its poles 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.
Solution:
(a): That pole of the magnet which is repelled by the north pole of the given magnet will be considered as north pole of the magnet.

Question 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.
Solution:
(a): Magnetic strengths of north pole and south pole of a magnet is same.

Question 6.
Fill in the blanks.
(i) When a bar magnet is broken; each of the broken part will have _________ pole/poles.
(ii) In a bar magnet, magnetic attraction is _____ near its ends.
Solution:
(i) two
(ii) more

Question 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?
Solution:
The pins are made of stainless steel which is a non-magnetic material.

Question 8.
How will you test that ‘tea dust’ is not adulterated with iron powder?
Solution:
By using a magnet we can test that tea dust’ is not adulterated with iron powder. If it has iron powder it will stick to the magnet.

Question 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 figure.

(i) Which regions of the magnet have more iron filings sticking to it?
(ii)What are these regions called?
Solution:
(i) The ends of the magnet have more iron filings attached to it.
(ii) These regions are called poles of the magnet.

Question 10.
Four identical iron bars were dipped in a heap of iron filings one by one. Figure shows the amount of iron filings sticking to each of them.

(a) Which of the iron bar is likely to be the strongest magnet?
(b) Which of the iron bars is not a magnet? Justify your answer.
Solution:
(a) Iron bar (a) is likely to be the strongest magnet as amount of iron filings sticking to it, is much more than other bars.
(b) Iron bar (b) is not a magnet because iron filings do not stick to it.

Question 11.
A toy car has a bar magnet laid hidden inside its body along its length. Using another magnet i how will you find out which pole of the magnet is facing the front of the car?
Solution:
If the front of the toy car gets attracted to the north pole of the given magnet then it is the south pole of the bar magnet hidden inside the car and vice-versa.

Question 12.
Match column I with column II (One option of I can match with more than one option of II.

 Column 1 Column II (a) Magnet attracts (i) rests along a particular direction (b) Magnet can be repelled by (ii) iron (c) Magnet if suspended freely (iii) another magnet (d) Poles of the magnet can be identified by (iv) iron filings

Solution:
(a) – (ii) , (iii) and (iv)
(b) – (iii)
(c) – (i)
(d) – (iii)

Question 13.
You are provided with two identical metal bars. , One out of the two is a magnet. Suggest two ways to identify the magnet.
Solution:
There can be following ways to identify the magnet out of the two identical metal bars :
(i) By freely suspending the metal bars. Magnet will rest along a particular direction.
(ii) By attracting iron filings.
(iii) By using another magnet. Like poles will repel each other while unlike poles will attract each other.

Question 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.
Solution:
The magnet on which the North-South poles are marked can be used to find out the magnet out of two bars.
The magnet with known poles will attract and repel two ends of a magnet while it will attract both the ends of an ordinary bar. This process is known as test for repulsion. To find out the poles of unknown magnet, we can use the same test. North pole marked on the given magnet will repel the north pole of unknown magnet.

Question 15.
Describe the steps involved in magnetising an iron strip with the help of a magnet.
Solution:
An iron strip can be magnetised by rubbing it with a magnet in a particular direction again and again as shown in figure.

Magnets can also be made with the help of electricity.

Question 16.
Figure 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 on the needle on bringing the bar magnet near it. Also draw the diagram to show the effect when the other end of the bar magnet is brought near it.

Solution:
The magnetic needle of the compass will get deflected.

Question 17.
Suggest an activity to prepare a magnetic compass by using an iron needle and a bar magnet.
Solution:
To prepare a magnetic compass, the given iron needle is magnetised by rubbing a bar magnet over it repeatedly in a particular direction. After that it may be set in a way so that it can rotate freely when suspended. Hence, the iron needle can act as compass and give north-south direction.

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

What inference could he draw from this observation? Explain.
Solution:
He could infer from this observation that the magnetic properties are induced into the iron bar and it acts like a magnet till the magnet is kept near it.

Question 19.
A bar magnet is cut into two pieces A and B, from the middle, as shown in figure.

Will the two pieces act as individual magnets? Mark the poles of these two pieces. Suggest an activity to verify your answer.
Solution:
Yes, the two pieces A and B will act as individual magnets. A magnet will always have two poles – north and south pole. Each piece will have two poles.

By the test of repulsion, we can conclude that these two pieces A and B will act as individual magnets.

Question 20.
Suggest an arrangement to store a U shaped magnet. How is this different from storing a pair of bar magnets?
Solution: U shaped magnet – One metal plate is placed across the two poles of the U shaped magnet to store it.

Bar magnet – Two metal plates and one wooden block is used and arranged as shown in the figure.

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