STD 6 Basic Science: Chapter 07 Attraction and Repulsion - Questions and Answers | Teaching Manual
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Chapter 07: Attraction and Repulsion - Textual Questions and Answers & Model Questions
* Whenever there is a strong wind, the front door of Neenu's house usually bangs against the wall. Neenu and her brother managed to get some
objects and they fixed them on the portion connecting the wall and the door. Now if the door is opened, it remains close to the wall itself. The door does not bang against the wall when the wind blows. Having noticed this their mother asked, “What trick have you both done there?”
1. What might have they done? Can you suggest any method using the objects mentioned below?
Set 1 - wooden block, gum
Set 2 - magnet, iron piece
Set 3 - two magnets
Set 4 - bricks
Answer: They use magnets and iron pieces. Fix an iron piece on the wall at the place where the door bangs against the wall. Then fix a magnet at the corresponding place on the door. If we fix a magnet on the door and the wall, there will be no attraction between the same poles. In the case of iron and magnet easy and attraction takes place.
2. Have you heard of magnets? What do you know about them?
Answer: Ancient Greeks found out that some stones that are seen in nature attract substances like Iron. Such stones with magnetic power are natural magnets. We use magnets of different shapes for different purposes. Most of the magnets that we use are artificial magnets.
3. Magnets attract certain objects. Which are they?
Answer: They are iron, cobalt, nickel and steel.
4. Bring pins, a blade, safety pins and an iron nail close to a magnet. See what happens.
Answer: All of them are attracted by the magnet.
5. From the given list, find out those who are attracted by a magnet.
Materials required:
Hinges, different coins, screwdriver, compass, Stainless steel utensil, aluminium wire, copper wire, pen, rubber, glass piece, spoon, gem clip,
plastic.
Tabulate your findings in the science diary.
Answer: They are made using iron, steel, cobalt and nickel.
7. What are magnetic and non - magnetic substances?
Answer: Substances attracted by magnets are magnetic substances and those not attracted are known as non - magnetic substances. Iron, nickel, cobalt and steel are magnetic substances.
8. Are all magnets of the same size and shape?
Answer: No
9. Do you have a magnet? What is its shape?
Answer: Yes, It is a Bar magnet
10. What are magnets made of?
Answer: Magnets are made using ‘alnico’, an alloy of aluminium, nickel, cobalt, and iron. Substances like neodymium and samarium are also used for making magnets.
11. What are the different purposes for which magnets are used?
Answer: Sound is produced by speakers in TV, radio, mike sets (public address systems) etc. Magnets are used in speakers. There are magnets in mobile phones and headphones too.
12. Find out more devices that make use of magnets and tabulate them.
Answer:
* Motors and generators.
* Transformers.
* Electric bells and buzzers.
* Loudspeakers and headphones.
* Magnetic recording and data storage equipment: tape recorders, VCRs, hard disks.
13. Observe both the figures.
i. What may be the reason for keeping big speakers in sound boxes and small ones in headphones?
Answer: Sound boxes are used to hear a large sound and headphones are used to hear a little sound.
ii. Do both the speakers need sounds of the same loudness?
Answer: No, the loudness of the soundbox is higher than headphones.
14. Complete the following table.
Answer: Loudspeakers would be ideal.
16. What may be the reason behind the difference in the shape and size of these magnets?
Answer: The shape and size of magnets differ according to the device in which they are placed. Arc shaped magnets or ring tube magnets are used in mini motors.
17. When magnets attract Is the attractive power the same on all sides of the magnets?
Materials required:
Iron dust, magnets of different shapes, thin plastic paper/polythene paper, a chart paper of A4 size.
Activity
Sprinkle iron dust loosely on the chart paper. Suspend a bar magnet using a thread and bring it near the iron dust.
i. Does the iron powder stick evenly to all parts of the magnet?
Answer: No
ii. In which part is it sticking more?
Answer: More iron dust is sticking at the ends of the magnet.
iii. In which part is it less?
Answer: At the middle part of the magnet, the iron dust is very less.
iv. What are the poles of magnets?
Answer: The end portions of a magnet where the magnetic force is strongly felt are the poles of the magnet.
v. Do all magnets have poles?
Answer: Yes, All magnets have poles
vi. Repeat the above activity using magnets of different shapes such as circular magnet, ring magnet and U magnet. Record your activities and findings in your science diary.
Answer: Sprinkle iron dust loosely on the chart paper. Suspend a circular magnet using a thread and bring it near the iron dust. Repeat these activities in-ring magnet and U magnet
Findings: In any type of magnet the magnetic power is greater at the ends.
18. Does a freely suspended magnet remain in one particular direction always?
Answer: Yes
Activity
Materials required: four-bar magnets, thread, scale. Take a bar magnet and suspend it horizontally using a thread in such a way that it is balanced. Ensure that there are no magnetic substances nearby.
a. In which direction are the poles when the magnet comes to rest?
Answer: South-North Direction
b. Suspend the other three magnets like this in different places in your classroom. Are all the magnets at rest in the same direction? Which is the direction?
Answer: A freely suspended magnet always rests in the north-south direction
19. Are there markings of S and N on the bar magnets that you have used?
Answer: Yes
20. Isn’t the end marked S in the south direction and the end marked N in the north direction?
Answer: Yes
21. Allow the magnets to rotate. Do all the magnets come to rest in the same direction?
Answer: Yes
22. When do we make use of this north-south directive property of magnets?
Answer:
* In ships to find the direction.
* To know the direction inside a forest.
* Find direction during a trip
23. Imagine that you are standing in an unknown place. You cant see the sun due to the rains. Can you find out the directions with the help of a bar magnet? How will you find out the east side?
Answer: Yes we can find out the direction with the help of a magnet.
We know that a freely suspended magnet always comes to rest in the north-south direction. Suspend the bar magnet using a thread. East will be in the clockwise direction of rotation from the north.
Activity:
24. Take two magnets on which N and S are marked. Place one of them on a surface. Bring the pole of the other magnet to the middle of this magnet. What do you observe?
Answer: Both the magnet attract each other.
i. Is it to the middle part of the first magnet that the second magnet is attracted?
Answer: No, it attracts the poles of magnets.
ii. Place the magnets closer to each other. Which poles stick to each other?
Answer: North pole attracts the south pole and the south pole attracts the north pole.
25. Examine the figures given below. Which of them are correct?
26. What happens if the poles are brought near to each other as shown in the figure given below?
Answer: North pole and the South pole attract each other.
ii. Which poles repel each other when the magnets are brought near?
Answer: When the north pole is brought near the north pole of another magnet, they repulse each other. When the South pole is brought near the south pole of another magnet, it repulses each other.
27. What are like poles?
Answer: Poles of the same type in magnets are like poles. Like poles of magnets repel each other
28. What are unlike poles?
Answer: opposite poles of magnets are unlike poles. unlike poles attract each other.
Activity:
29. Place the needle on a surface. Using one pole of the magnet rub the needle from one end to the other. Repeat the process by lifting the magnet and bringing it to the original position. Rub the needle 15 – 20 times.
* Rub using one pole alone.
* Rub in the same direction only.
i. How will you find out whether this needle has acquired magnetism or not?
Answer: Put some iron dust near to it. If the needle attracts it, the needle will be magnetised
ii. Can this magnetised needle be used in determining the poles of magnets of different shapes?
Answer: Yes this can be used.
iii. Suspend the needle using a thread in such a way that it is balanced. Bring a bar magnet near the needle. What do you observe? Bring the other end of the magnet near the needle. Record your findings in your science diary.
Answer: When we bring a bar magnet near this needle at one end attraction takes place and the other end repulsion takes place.
iv. Can you find out the polarity of the magnetised needle?
Answer: Yes, we can find the polarity of a magnetised needle. Suspend the needle using a thread in such a way that it is balanced. The end of the needle points towards the north direction will be the north pole and the end of the needle points towards the south
v. Similarly magnetise a blade. Then take a vessel filled with water and gently place the blade on the water so that it floats. What can you infer if the blade comes to rest in the north-south direction?
Answer: The Blades becomes a magnet.
Activity:
30. Suspend the needle using the thread in such a way that it is balanced.
Place the scale on the table in such a way that one end of it is below the
needle. Move the magnet on the scale from the other end to the side of the
needle. Stop moving the magnet when the attractive force is felt on the needle.
Measure the distance to the needle.
Slowly move the magnet towards the needle. Observe the changes in the
needle in each instance.
i. Is there a change in the attractive force on bringing the magnet near the needle?
Answer: Yes, there is a change in attractive force on bringing the magnet near the needle.
ii. When is the force of attraction of the needle at the maximum?
Answer: The force of the attraction of the needle is maximum at the region near the poles.
31. Place an A4 size chart paper on the table as shown in the figure. Sprinkle some iron dust over it loosely. Bring the magnet below the paper. Gently tap the paper.
Record your activities and observations in the science diary.
Observation: We can see more iron dust on the two ends of the magnet than in other parts of the magnet.
Repeat the experiment using different magnets.
i. Is the attractive power the same for all magnets?
Answer: No, the attractive power is not the same
ii. Is there any difference while using a U magnet? Write down your
inference in the science diary.
Answer: The U - magnet is more powerful than the bar magnet because the north and the south pole face each other and hence the attractive force is doubled.
32. What is the magnetic field?
Answer: The region around a magnet where the force of the magnet is felt is the magnetic field.
Let us asses
1. Of two identical substances, one is an iron piece and the other is a magnet. How do you distinguish between the two?
Answer: Suspend both objects horizontally using threads in such a way that it is balanced. The magnet will come in a North-south direction. But, the iron will not come in that direction.
2. Two bar magnets remain attractive. One pole is marked. Mark the other
poles.
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