Class 6 Science Chapter 4 Extra Questions Exploring Magnets
Class 6 Science Chapter 4 Exploring Magnets Important Extra Questions and Answers
Exploring Magnets Class 6 Extra Questions Very Short Answer Type
Question 1.
Give the name of natural material that acts as a magnet.
Answer:
Magnetite is the name of natural material that acts as a magnet.
Question 2.
Is the soil a magnetic or a non-magnetic material?
Answer:
The soil is generally a non-magnetic material but some iron filings are available in the soil which can stick to magnet.
Question 3.
Name a device that is helpful in finding directions.
Answer:
A magnetic compass
Question 4.
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. NCERT Exemplar
(a) Briefly tell the regions of the magnet that have more iron filings sticking to it.
(b) Mention what are these regions called?
Answer:
(a) Pole regions of the magnet have more iron filings sticking to it.
(b) These are called north pole and south pole, respectively.
Question 5.
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:
She could not succeed because the stainless steel pins are not made of iron, so they do not get attracted towards magnet.
Question 6.
State the ways through which a magnet can be demagnetised.
Answer:
There are following two ways to demagnetise a magnet:
(i) by heating
(ii) by hammering
Question 7.
In which direction, a freely suspended magnet orients itself?
Answer:
A freely suspended magnet orients itself in the north-south direction.
Question 8.
Which magnetic pole of earth is aligned with geographic north pole?
Answer:
Earth itself is a giant magnet. It’s magnetic south is aligned with the geographic north pole.
Question 9.
When south pole of a magnet comes in contact with south pole of other magnet, than what happens?
Answer:
When south pole of a magnet comes in contact with south pole of the other magnet, then they repel each other because like poles always repel each other.
Question 10.
Insert a magnetised needle through a paper cork. Let the cork float in the water placed in a tub in such a way that the cork does not touch the water. Does the needle always point in the same direction when the cork stops rotating?
Answer:
Yes, the needle always points in the same direction when the cork stops rotating.
Question 11.
Mention a way to magnetise a magnetic material with a natural magnet.
Answer:
A magnetic material can be magnetised by rubbing in a particular direction.
Question 12.
Give one method to store magnets.
Answer:
Write any one.
- Keep magnets in pairs with unlike poles on the same ‘side.
- Keep a piece of wood in between while storing magnets.
- Place two pieces of soft iron across the ends.
Exploring Magnets Class 6 Extra Questions Short Answer Type
Question 1.
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. NCERT Exemplar
Answer:
When we place any iron bar near a bar magnet, it becomes a temporary magnet and small objects like pin, iron filings can be attracted by it. But when we remove this bar from magnet, it again becomes an iron bar and does not attract the small iron objects.
Question 2.
Will the two cars speed towards each other or run away from each other when brought closer? Justify your answer.
Answer:
The dotted end of the magnet represents the North Pole of a magnet. The picture represents that the north pole of both the magnets are facing each other which results in the repulsive force between them. Therefore, both the cars will run away from each other when they are brought closer.
Question 3.
Explain how will you test that the ‘tea dust’ is not adulterated with iron powder? NCERT Exemplar
Answer:
We can do simple experiment for this.
- Take tea dust on a paper.
- Take a bar magnet in your hand.
- Shake the bar magnet over this dust.
- If some particles are attracted strongly towards this magnet, then definately tea dust will have iron powder.
Question 4.
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 bar is not a magnet? Justify your answer. NCERT Exemplar
Answer:
(a) Iron bar (i) seems to be the strongest magnet because it has maximum amount of iron filings attracted.
(b) Iron bar (ii) is not a magnet because no iron filings have been attracted by it.
Question 5.
Charges can exist separately. Is it true for magnetic poles too? Give reasons.
Answer:
It is not true for magnetic poles. They always exist in pairs. When we break a magnet from middle, we get two new magnets with two poles in each of them. Even if an extremely small magnet is broken into two pieces, two poles (north and south) generate on the both ends of each piece.
Question 6.
Priya went a place for her summer vacation with her sister Monami Mukherji. As the day was dark, so she couldn’t confirm that in which direction is east. Her sister had a magnetic compass and she told Priya to find the direction with the compass.
(a) State the values that Monami Mukherji reflect here.
(b) How does a compass needle work?
Answer:
(a) Monami is intelligent and caring girl.
(b) A compass needle rests itself in the north-south direction. Right to north is the east direction.
Question 7.
A toy car has a bar magnet laid hidden inside its body along its length. Using another magnet, how will you find out which pole of the magnet is facing the front of the car? NCERT Exemplar
Answer:
If we face north pole towards the front side of the car and the car is attracted, it means its front side pole is south pole and if it is going away, it means its front side is north pole.,
Question 8.
Suggest an arrangement to store a U-shaped magnet. How is this different from storing a pair of bar magnets?
Answer:
It is a suggested way as shown in figure below.
U -shaped magnet is kept along with an iron piece while bar magnets are kept in pairs with opposite poles on the same side along with iron strips and magnets separated by wood along their length.
Question 9.
What other than a magnetic compass is helpful in determining directions?
Answer:
The sun also helps us in determining directions. If one is facing the rising sun, then there will be south direction to his right and north to his left. After finding one direction, one can easily gat all directions.
Question 10.
Explain the different ways in which markings of polarity can be done on artificial magnets.
Answer:
In some magnets, the north and south poles are marked as N and S. In some other magnets, the north pole is indicated by a white dot. Sometimes, the north pole of a magnet is painted red and south pole is painted blue.
Exploring Magnets Class 6 Extra Questions Long Short Answer Type
Question 1.
A bar magnet is cut into two pieces A and B from the middle as shown in figure.
Will the two pleces act as individual magnets? Mark the poles of these two pleces. Suggest an activity to verify your answer. NCERT Exemplar
Answer:
Yes, two pieces will work as an individual magnets because a monopole (single pole) of magnet never exists.
Activity :
- Place the magnet, so formed (A and B) on the table.
- Bring the north pole of both magnets towards each other, they will be repelled.
- Bring the north and south poles of both magnets towards each other, they will attract.
Question 2.
Write an activity to show that a freely suspended bar magnet always comes to rest in north-south direction.
Answer:
Refer to Activity 3.
Question 3.
Given figure shows a magnetic compass. Briefly explain what will happen to the position of its needle, if you bring a bar magnet near to it. Also, draw a diagram to show the effect on the needle on bringing the bar magnet near to it. Also, draw the diagram to show the effect when the other end of the bar magnet is brought near to it.
Answer:
When we bring a bar magnet near the compass, the needle of the magnetic compass starts deflecting.
As the north pole of the magnet is brought closer to the compass, the south needle of compass points towards it. As the south pole of the magnet is brought closer to the compass, the north needle of compass points towards it.
Question 4.
Describe the steps involved in the magnetising of an iron strip with the help of a magnet.
Answer:
Refer to Activity 4 (Point 1).
Question 5.
What is a magnetic compass? Suggest an activity to prepare a magnetic compass by using a magnetized sewing needle.
Answer:
An instrument uses a magnetic needle to indicate direction relative to the earth’s magnetic poles. [For second part, Refer to Activity 4]
Question 6.
Three identical bars are kept on a table. Two out of three bars are magnets. In one of the magnets, 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. NCERT Exemplar
Answer:
To find out the magnet-
- Take the bar magnet A in your hand.
- Take the bar magnet B in other hand.
- Bring one side of B towards south pole and note down it is attracted or repelled.
- Bring other side of B towards south pole and again note down the same thing.
- If there is an attraction in both cases (iii) and (iv), then it is definitely an iron bar.
- If there is an attraction in one case and repulsion in other case, then it is a bar magnet.
- Do the same for the iron bar C.
To find out the poles-
If in case (iii), the bar is attracted, then it is north pole of the identified bar magnet. If bar is repelled, then it is obviously a south pole of the identified bar magnet.
Exploring Magnets Class 6 Extra Questions Skill Based
Question 1.
(i) Observe the picture given and mark the missing poles of the magnets in the table given below.
(ii) Out of the two properties shown above in figure, which property is considered a sure test of magnetism?
(iii) A student is given two bars which look identical. Suggest how the student could identify which bar is a magnet.
Answer:
Put both metal bars in the iron filings and pull them out as soon as possible. Some iron filings will be attracted to the magnet, while the simple metal bar remain plain.
Question 2.
Identify the set of ring magnets having same poles aligned towards each other. Explain your reasoning. – Thinking Skill
Answer:
Like poles of magnet repels each other. In the figure, magnet 1 and 2 show repulsion with each other and magnet 3 and 4 also show repulsion. Hence, same poles of magnet 1 and 2 aligned towards each other similarly poles of magnet 3 and 4 aligned towards each other.
Question 3.
Observe the given figure and identify the correct statements. – Thinking Skill
I. Pole 1 will be attracted to poles 3 and 7.
II. Pole 8 will be repelled by poles 6 and 4.
III. Poles 1 and 3 are unlike poles.
IV. Poles 2, 4, 6 and 8 are like poles.
(a) I and III only
(b) II and IV only
(c) II and III only
(d) I and IV only
Answer:
In option (b) II and IV only are correct.
Question 4.
Try to lift steel pins or paperclips by using a bar magnet and a horseshoe magnet one by one. Which magnet picks up the more number of pins/clips? Discuss. – Thilnking skill
Answer:
A horse shoe magnet is stronger compared to same length of a bar magnet because its poles are in the same plane and closer to each other. Hence, horse shoe magnet will left more clips.
Question 5.
The diagram shows a magnet attracting three steel pins while another magnet is approaching slowly from left. What will happen to the string of attracted pins? – Thilnking skill
(a) Repels to the right
(b) Attracts to the left
(c) Falls off from the magnet
(d) Remains stationary
Answer:
(b) Attracts to the left