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Science [1 Marks Each] QUE - ANS

Fun with Magnets · Gujarat Board (GSEB) STD 6 (GSEB - English Medium). 78 questions.

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[1 Marks Each] QUE - ANS

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Question 11 Mark
Where are south and north poles of earth’s magnet?
Answer
Earth’s magnetic south-pole is near the geographic north-pole and north-pole of earth’s magnet is near geographic south-pole.
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Question 21 Mark
State whether the statement are true or false:
A cylindrical magnet has only one pole.
Answer
Flase.
Explanation:
Magnets always have two poles; the north pole and the south pole. A cylindrical magnet also has two poles.
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Question 41 Mark
How magnets lose their property?
Answer
Magnets lose their property if they are heated, hammered, dropped from some height or not stored properly.
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Question 51 Mark
Fill in the blank:
Artificial magnets are made in different shapes such as __________, ______ and ____________.
Answer
Artificial magnets are made in different shapes such as bar magnets, horse-shoe magnets, and cylindrical magnets.
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Question 61 Mark
What is magnetic force?
Answer
The force exerted between magnetic poles, producing magnetisation is called magnetic force.
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Question 71 Mark
Activity:Spread some iron filings on a sheet of paper. Now, place a bar magnet on this sheet. What do you observe? Do the iron filings stick all over the magnet?
  1. Do you observe that more iron filings get attracted to some parts of the magnet than others?

More iron filings get attracted to ends of the magnet where the magnetic force is maximum.Remove the iron filings sticking to the magnet and repeat the activity.
  1. Do you observe any change in the pattern with which the iron filings get attracted by different parts of the magnet?
Answer
  1. No, the iron filings will stick only on the poles or the ends of the magnet.
  2. No, there is no change in the pattern.
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Question 81 Mark
How did we come to know that magnet is helpful to find (detect) directions?
Answer
About 800 years ago, Chinese saw that a hanging lodestone always comes to rest in a particular direction i.e., north-south. Therefore, they came to know about finding the direction with the help of lodestone.
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Question 91 Mark
State whether the statement are true or false:
Artificial magnets were discovered in Greece.
Answer
Flase.
Explanation:
Artificial magnets were not discovered in Greece. Only natural magnets were discovered in Greece.
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Question 101 Mark
How can we find out near which end is North Pole located in a bar magnet?
Answer
Hang up the magnet by a cotton thread so that it hangs freely. When it comes to rest, we note that magnet is lying in north-south direction.
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Question 111 Mark
Give two examples each of magnetic and non magnetic material.
Answer
Example of magnetic material are iron, nickel etc. Examples of non magnetic material are plastic, rubber etc.
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Question 121 Mark
What are the properties of a magnet?
Answer
  • It attracts iron pieces towards itself.
  • It always aligns itself in the same direction, if left to rotate freely.
  • It is composed of oxides of iron ($\text {fe}_{3}\text{O}_{4}$).
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Question 131 Mark
How do magnet trains run without touching the ground?
Answer
A huge magnetic field is created by electrified coils in the guideway walls, which propel the train.
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Question 141 Mark
Fill in the blank:
A magnet always has __________ poles.
Answer
A magnet always has two poles.
Explanation:
A magnet has two poles called the south pole $(S)$ and the north pole $(N).$
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Question 151 Mark
Where will the maximum iron fillings stick on a bar magnet when it is brought near them?
Answer
At the ends of bar magnet.
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Question 171 Mark
When a bar magnet was brought close to a compass, the orientation of the needle became as shown in figure. Identify the poles on the ends of the bar magnet marked $A’$ and $‘B’$. Explain how you arrived at your answer.
Answer
Orientation of the needle clearly shows that red marked ‘ end (north-pole) attracts the end of bar magnet marked $“A”$. It means both these are unlike poles and the end of bar magnet marked $“A”$ is south-pole. End marked $‘B’$ is north-pole because like (same) poles repel each other.
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Question 191 Mark
What are soft and hard magnetic materials?
Answer
Soft iron is called soft magnetic material because it loses its magnetism easily. Soft iron is used in making electromagnets.
Steel is called a ‘hard’ magnetic material because it does not lose its magnetism so easily. It is used to make permanent magnets.
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Question 201 Mark
Fill in the blank:
Paper is not a ______ material.
Answer
Paper is not a magnetic material.
Explanation:
Paper is not attracted by magnet. Hence, it is not a magnetic material.
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Question 211 Mark
What is the principle on which magnetic compass works?
Answer
When a bar magnet moves or rotates freely, it comes to rest in north south direction. This is the principle on which magnetic compass works.
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Question 221 Mark
What happens when a pole of a bar magnet say its north-pole is marked with a chalk and suspended freely? What do you observe on rotating the bar magnet?
Answer
The marked pole comes to rest in north direction. On rotating, after some time, it again comes to rest in north direction.
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Question 231 Mark
Are both poles of a magnet similar?
Answer
No, the two poles of a magnet are not similar (alike). Both have different tendency. The pole that points towards the north is called north-pole while the pole pointing always towards the south is called south-pole.
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Question 251 Mark
Write the names of some non-magnetic substances.
Answer
Rubber, Cotton, Plastic, Wood, Button, Cloth, etc.
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Question 271 Mark
What will happen to the magnet when we cut it into two pieces?
Answer
When we cut a bar magnet into two pieces, both these pieces act as magnets and we get two magnets.
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Question 291 Mark
To which part of the magnet do none or only a few iron filings (or pins) stick?
Answer
Minimum number of iron filings stick to the middle part of the magnet. Magnet has its magnetic effect least in this part (middle part).
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Question 301 Mark
What are magnetic materials?
Answer
The materials which get attracted towards a magnet are magnetic materials.
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Question 311 Mark
Why does bar magnet always point in north-south directions?
Answer
Bar magnet always points in north-south directions when left freely suspended because earth itself behaves like a magnet and north-pole of bar magnet is attracted towards south-pole of earth’s magnet and vice versa.
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Question 321 Mark
Fill in the blank:
In olden days, sailors used to find direction by suspending a piece of ___________.
Answer
In olden days, sailors used to find direction by suspending a piece of bar magnet.
Explanation:
A freely suspended magnet always comes to rest in the North-South direction.
Hence, sailors used to find direction by suspending a piece of bar magnet.
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Question 331 Mark
Fill in the blanks:
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 poles.
Explanation:
Two; When a bar magnet is broken, each of the broken part will behave as a magnet having two magnetic poles, North and South.
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Question 341 Mark
Boojho kept a magnet close to an ordinary iron bar. He observed that the iron bar attracts a pin as shown below.
What inference could he draw from this observation? Explain.
Answer
The magnetic properties are induced into the iron bar and it acts like a magnet till the magnet is kept near it.
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Question 361 Mark
State whether the statement are true or false:
Rubber is a magnetic material.
Answer
False.
Explanation:
Rubber is not attracted by a magnet.
Hence, it is a non-magnetic material.
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Question 371 Mark
State whether the statement are true or false:
Maximum iron filings stick in the middle of a bar magnet when it is brought near them.
Answer
False.
Explanation:
The amount of iron filings that stick to a bar magnet depends on the strength of the magnet. The magnetism of a bar magnet is maximum at its two poles and minimum in the middle.
Hence, maximum iron filings will stick at the two ends of the magnet and minimum in the middle.
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Question 381 Mark
Study the pictures carefully and answer the questions that follow.
Will the two magnets attract or repel each other? Why?
Answer
The two magnets will repel each other because like poles repel.
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Question 391 Mark
What are non-magnetic materials?
Answer
Materials which are not attracted towards a magnet are non-magnetic materials.
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Question 401 Mark
Freely suspended magnet always comes to rest in a particular direction. Which is that direction?
Answer
North-south direction.
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Question 411 Mark
In which direction does freely suspended magnet rest?
Answer
A freely suspended magnet always points in the north-south direction.
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Question 421 Mark
When do two magnets attract each other?
Answer
Two magnets attract each other when their unlike (opposite) poles come close to each other.
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Question 431 Mark
What do you mean by magnetic field?
Answer
The region around the magnet where its magnetic influence can be felt is called the magnetic field of the magnet.
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Question 441 Mark
Fill in the blank:
The Materials which are attracted towards a magnet are called________.
Answer
Materials which are attracted towards magnets are called magnetic materials.
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Question 451 Mark
Which is the south-pole of a bar magnet?
Answer
It is the tip of a bar magnet that points towards the south direction.
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Question 471 Mark
Does the compass needle point in different directions?
Answer
The compass needle has a magnetic needle closed in a glass covering. The needle can rotate on its pin pointed base. Its red marked end always indicates towards the north direction. It always rests in north-south directions. We use it to find out the direction.
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Question 481 Mark
Artificial magnets are made in different shapes. Give some examples.
Answer
Bar magnet, horse shoe magnet, cylindrical magnet etc.
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Question 491 Mark
If a bar magnet is cut length wise into two parts, how many number of poles will form?
Answer
Four poles will be formed. Two north and two south poles.
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Question 501 Mark
What is $MRI?$
Answer
Magnetic Resonance Imaging $(MRI)$ is a medical diagnostic technique which uses the magnetic field inside the body for obtaining images of different parts of the body.
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[1 Marks Each] QUE - ANS - Science STD 6 Questions - Vidyadip