Question Answers For All Chapters – General Science Class 6
Fun with Magnets
Exercise
1. How will you do this?
(a) Determine whether a material is magnetic or non-magnetic:
Answer – Take a magnet and bring it near the material.
If the material sticks to the magnet, it is magnetic.
If it does not stick, it is non-magnetic.
(b) Explain that a magnet has a certain magnetic field:
Answer – Place some iron filings on a piece of paper.
Move a magnet under the paper.
The iron filings will arrange in a pattern showing the magnetic field.
(c) Find the north pole of a magnet:
Answer – Hang a bar magnet freely with a thread.
The end pointing towards the north is the north pole of the magnet.
2. Which magnet will you use?
Answer – (a) Iron is to be separated from trash: A strong bar magnet or an electromagnet.
(b) You are lost in a forest: A magnetic compass to find directions.
(c) A window shutter opens and shuts continuously in the wind: A magnet can be used to keep it in place.
3. Fill in the blanks with the appropriate word:
(a) If a bar magnet is hung by a thread tied at its center, its north pole becomes steady in the direction of the North pole of the Earth.
(b) If a bar magnet is cut into equal pieces by cutting it at right angles to its axis at two places, 3 bar magnets are formed, and a total of 6 poles are formed.
(c) There is repulsion between the like poles of a magnet, and attraction between its opposite poles.
(d) When a magnetic material is taken close to a magnet, the material acquires induced magnetism.
(e) If a magnet attracts a piece of metal, that piece must be made of magnetic material or iron.
(f) A magnet remains steady in a north-south direction.
4. Write the answers in your words:
(a) How is an electromagnet made?
Answer – Take an iron nail and a long insulated copper wire.
Wind the wire around the nail and connect both ends to a battery.
When electricity flows, the nail becomes a magnet.
When the battery is removed, the magnetism disappears.
(b) Write the properties of a magnet:
Answer – A magnet has two poles – North and South.
Like poles repel, and opposite poles attract.
A freely suspended magnet always points in the north-south direction.
If a magnet is broken, each piece forms a new magnet with both poles.
Magnets attract magnetic materials like iron, cobalt, and nickel.
(c) What are the practical uses of a magnet?
Answer – Used in compasses for navigation.
Used in electric bells and speakers.
Used in cranes to lift heavy iron objects.
Used in ATM cards, computers, and hard disks.
Used in Maglev trains for fast travel.
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