Class 6 Science Chapter 10 Question Answers - Fun with Magnets

SHORT ANSWER TYPE QUESTIONS 

Q.1. What is the difference between magnetic and non-magnetic material? Give examples.
Ans. The materials which get attracted towards a magnet are magnetic materials.
Example: iron, cobalt etc.
Materials which are not attracted towards a magnet are non-magnetic materials.
Example: plastic, glass etc.

Q.2. Write any two uses of magnet.
Ans. 
(a) Magnetic compass can be used to know about the directions.
(b) Magnet can be used to separate magnetic materials such as iron from the non-magnetic ones.

Q.3. What is a magnetic compass?
Ans. Magnetic compass is a small box with glass cover. It consists of a magnetized needle, which rotates freely and indicates north south direction when comes to rest.

Fig: Magnetic Compass

Q.4. Where are the poles of a bar magnet located?
Ans. The two ends of the bar magnet represents its two poles.

Fig: Poles of a bar magnet located

Q.5. Write any three properties of a magnet?
Ans.
(a) Magnet has two poles north and South Pole.
(b) Same poles of two magnets repel each other.
(c) Opposite poles of two magnets attract each other.

Q.6. What is the principle on which magnetic compass works?
Ans. 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.

Q.7. Write two cautions to keep a magnet.
Ans. Bar magnets should be kept in pairs with their unlike poles on the same side. They must be separated by piece of wood. For horse shoe magnet one should keep a piece of iron across the poles.

Q.8. What is an electromagnet?
Ans. A soft metal core made into a magnet by the passage of electric current through a coil surrounding it.

Fig: Electromagnet

Q.9. How should we keep a horse shoe magnet to prevent it from demagnetising?
Ans. For horse shoe magnet one should keep a piece of iron across the poles.

Q.10. How magnets lose their property?
Ans. Magnets lose their property if they are heated, hammered, dropped from some height or not stored properly.

Q.11. How can we find out near which end is North Pole located in a bar magnet?
Ans. 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.

Q.12. Match the following:

Ans.

Q.13. If a bar magnet is cut length wise into two parts, how many number of poles will form?
Ans. Four poles will be formed. Two north and two south poles.

Q.14. Classify the following as magnetic and non magnetic material: 
Iron, plastic, rubber, glass, mirror, cobalt.
Ans.
Magnetic material-iron, cobalt.
Non-magnetic material-plastic, rubber, glass, mirror.

LONG ANSWER TYPE QUESTIONS 

Q.1. How was magnet discovered?
Ans. It is said that magnet was discovered in Greece. A shepherd name Magnes used to take a stick with him to control his heard. One day he was surprised to see that he had to pull hard to free his stick from a rock on the mountainside. The rock was natural magnet and it attracted iron tip of shepherd’s stick.