RBSE Class 6 Science Important Questions Chapter 13 Fun with Magnets

Rajasthan Board  RBSE Class 6 Science Important Questions Chapter 13 Fun with Magnets Important Questions and Answers.

RBSE Class 6 Science Chapter 13 Important Questions Fun with Magnets

Other Important Questions 

Question 1. 
When a magnet is suspended freely with the help of a string, it aligns itself in direction.
(a) North-East 
(b) East-West
(c) North-South 
(d) South-West
Answer:
(c) North-South 

 

Question 2. 
Unlike poles each other.
(a) repel
(b) no effect
(c) attract
(d) none of these
Answer:
(c) attract

Question 3. 
Which of the following is a natural magnet?
(a) Iron
(b) Cobalt
(c) Nickel
(d) Magnetite
Answer:
(b) Cobalt

Question 4. 
Which of the following represents the shape of magnet?
(a) Cylindrical
(b) Rectangle
(c) Horse-shoe
(d) All of these
Answer:
(b) Rectangle

Question 5. 
The strength of magnet is maximum at:
(a) north pole
(b) south pole
(c) at middle
(d) both (a) and (b)
Answer: 
(d) both (a) and (b)

Fill in the Blanks

Question 1. 
Silver is a ................. material.
Answer:
non-magnetic

Question 2. 
Like poles of magnet ................ each other.
Answer:
repel

Question 3. 
The magnetism of a magnet is lost by ................. the magnet.
Answer:
heating or hammering

Question 4.  
................ is the surest test of magnetism.
Answer:
Repulsion

Question 5.  
............... is it a device used by pilots or sailors to find the direction? 
Answer: 
Magnetic compass

State whether True or False

Question 1. 
Magnetite is a natural magnet.
Answer:
True

Question 2. 
A horseshoe magnet has only one pole.
Answer:
False

Question 3. 
4 North and 4 South will be formed when a bar magnet is cut into four pieces along its length.
Answer:
True

Question 4. 
Loadstone is a magnetic material.
Answer:
True

Question 5. 
We can easily make an artificial magnet with natural magnet.
Answer: 
True

Match the followings

Column I	Column II
1. Bar magnet has  poles	(a) attract each other
2. Magnetite	(b) contains magnet in it
3. Wood	(c) attracted by magnet
4. Magnes	(d) man-made
5. Iron	(e) natural magnet
6. Compass needle	(f) contains tiny pieces of iron
7. Unlike poles	(g)  at both ends
8. South Pole- South Pole	(h) non-magnet
9. Artificial magnet	(i) repel each other
10. Soil	(j) discovered magnet

Answer:

Column I	Column II
1. Bar magnet has  poles	(g)  at both ends
2. Magnetite	(e) natural magnet
3. Wood	(h) non-magnet
4. Magnes	(j) discovered magnet
5. Iron	(c) attracted by magnet
6. Compass needle	(b) contains magnet in it
7. Unlike poles	(a) attract each other
8. South Pole- South Pole	(i) repel each other
9. Artificial magnet	(d) man-made
10. Soil	(f) contains tiny pieces of iron

Very Short Answer Type Questions

Question 1. 
Who discovered magnet?
Answer: 
A shepherd named Magnes, lived in Greece discovered magnet in around 800 B.C. He named magnet as magnetite.

Question 2. 
What are magnets?
Answer: 
The substances which attract magnetic materials like nickel, iron, cobalt, etc. are called magnets.

Question 3. 
How many poles are there in a magnet?
Answer: 
There are two poles, North and South.

Question 4. 
Which magnet is used in electric bell?
Answer: 
In an electric bell, a U-shaped electromagnet is used.

Question 5. 
Is it possible to have only one pole in magnet?
Answer: 
No, the magnet always consists of poles in pair, i.e. the North Pole and the South Pole.

Question 6. 
What happens when similar poles come closer?
Answer: 
When similar poles come closer they repel each other.

Question 7. 
What happens when the North Pole of a magnet is placed near the South Pole of another magnet?
Answer: 
When the North Pole of a magnet is placed near the South Pole of another magnet, they attract each other.

Short Answer Type Questions

Question 1. 
Write any two uses of magnets.
Answer:
The two uses of magnet are:

1. Magnetic compass can be used to know the directions. 
2. Magnet can be used to separate magnetic materials such as iron from the non-magnetic ones.

Question 2. 
What is a natural magnet?
Answer: 
A natural magnet is a substance that attracts the iron, cobalt, loadstone and nickel, on being suspended freely, its ends always stay in north and south directions.

Question 3. 
How does a magnet show direction?
Answer: 
When a magnet is suspended freely by using a thread, it always aligns itself in North-South directions.

Question 4. 
What will happen if we break a magnet into two pieces?
Answer: 
When we break or cut a magnet, both these pieces act as a magnet.

Question 5. 
What do you mean by magnetic compass?
Answer:
The magnetic compass is a small box with glass cover. It consists of a magnetized needle, which rotates freely and when it comes to rest, it indicates a North-South direction.

Question 6. 
Why is compass needle kept in a glass cover?
Answer: 
Compass needle is kept in a glass cover so that it does not deflect in any direction due to the pressure of air and shows the correct directions only.

Question 7. 
What is a temporary magnet? What material is used for this purpose? Answer: If a magnet loses its property within a very short period of time, it is called a temporary magnet. They are usually made up of soft iron.

Question 8. 
How can a magnet get demagnetized?
Answer: 

1. Magnets lose their property if they are heated.
2. It can be demagnetized by hammering it.
3. Magnets lose their properties if dropped from a height.

Long Answer Type Questions

Question 1. 
How did the discovery of magnets take place?
Answer: 
One day a shepherd took his herd of sheep and goats on the mountain for grazing, his stick which had iron tip at the bottom got stuck on the rock of the mountain. It seemed as if the stick, got attracted by the rock. This rock was the natural magnet (magnetite). This is how magnet was discovered.

Question 2. 
Write the difference between magnetic and non-magnetic materials. 
Answer: 
Magnetic material: The materials which get attracted towards a magnet are magnetic materials. For example, iron, nickel, cobalt, etc. Non-magnetic material: The materials which are not attracted towards a magnet are non-magnetic materials. For example, gold, silver, wood, plastic, etc.

Question 3. 
Write an activity to show that sand or soil contains magnetic materials. 
Answer: 
Rub a magnet in the sand or soil. You will observe some particles of sand or soil sticking to the magnet. Now, gently shake the magnet to remove the particles of sand or soil. You will still find that some particles are sticking to it. These particles are the small pieces of iron picked up from the soil. Hence with this activity, we can find out whether the soil or sand from a given place contains particles that have magnetic materials.

Question 4. 
Suggest a method to locate poles in a bar magnet.
Answer: 
Place a magnet on paper and sprinkle some iron filings on it. It is seen that most of the iron filings get attracted towards the ends compared to the central portion of the bar magnet. It indicates that the poles are located towards the end of the magnet.

Question 5. 
Write an activity to find out North Pole and South Pole of a magnet.
Answer: 
Take two small toy cars and mark them A and B. Place a bar magnet on top of each car along its length and fix them with rubber bands. In-car A, keep the South Pole of the magnet towards its front. Place the magnet in opposite direction in car B as shown in fig. (a). Now, place the two cars close to one another. You will observe the two cars attract each other and collide. Now, put the two cars in same direction as shown in the Fig. (b). You will observe they repel each other. This is how we can find out the two poles of a bar magnet.

Question 6. 
How should we save magnetic properties of a magnet?
Answer: 

1. To keep them safe, bar magnets should be kept in pairs with their unlike poles on the same side.
2. They must be separated by a piece of wood while two pieces of soft iron should be placed across their ends.
3. Magnets should be kept away from cassettes, mobiles, televisions, music systems, computers, etc.