🧲 Answers- Practice Questions – Fun with Magnets

🧲 FUN WITH MAGNETS – Practice Worksheet

Class 5 Science

A. Fill in the Blanks

  1. The materials that stick to a magnet are called magnetic materials.
  2. Iron, cobalt and nickel are magnetic metals.
  3. A freely suspended magnet always settles in the north–south direction.
  4. The end of a magnet pointing towards north is called the north pole.
  5. Magnetic force is concentrated at the two ends (poles) of a magnet.
  6. When a magnet is cut into two pieces, two independent magnets are formed.
  7. The temporary magnet made using electric current is called an electromagnet.
  8. Magnetism gets destroyed when a magnet is heated, thrown, knocked or broken.

B. True or False

1. Plastic and wood are magnetic materials. False
2. Like poles attract each other. False
3. Unlike poles repel each other. False
4. A magnet has only one pole. False
5. A magnet can attract iron filings. True
6. Electromagnets work only when current flows. True

C. Match the Following (Answers)

Column A Column B
Lodestone Natural magnet
Magnet keeper Protects a magnet
ATM card Stores information
Door bell Uses electromagnet

D. Very Short Answers

1. What is a magnet?
A material that attracts iron, nickel and cobalt.
2. What is magnetism?
The property of attracting magnetic materials.
3. What is an electromagnet?
A temporary magnet made using electric current.

E. Short Answers

Why do pins in a pin holder not fall when upside down?
Because a magnet inside the cap holds the pins.
Why does a fridge door close automatically?
Because a magnet is fitted inside the door.
Why do iron filings stick more at the poles?
Because magnetic force is strongest at the poles.

Difference: Permanent Magnet vs Electromagnet

Permanent Magnet Electromagnet
Magnetism is permanent Magnetism is temporary
Does not need electricity Needs electric current

🧲 F. Long Answer Questions (Detailed)

1. Activity to show north–south direction:

1️⃣ Activity: Freely Suspended Magnet

Activity Steps:

  • Take a bar magnet.
  • Tie a thin thread at its centre.
  • Suspend it freely from a stand.
  • Make sure it does not touch anything.

After some time, the magnet stops moving and settles in the north–south direction. If you disturb it and leave it again, it will again settle in the same direction.

The end pointing towards north is called the North Pole, and the other end is called the South Pole.

Conclusion: A freely suspended magnet always aligns in the north–south direction.

2. How to make an electromagnet:

2️⃣ Activity: Making an Electromagnet

An electromagnet is a temporary magnet made using electric current.

Steps:

  1. Take a long iron nail.
  2. Wind insulated copper wire tightly around it.
  3. Leave free wire at both ends.
  4. Connect both ends to an electric cell.

When current flows, the nail becomes magnetised and attracts pins or paper clips. When the connection is removed, magnetism disappears and the pins fall.

Conclusion: Magnetism produced by electricity is temporary.

3️⃣ Attraction and Repulsion

A magnet has two poles:

  • North Pole
  • South Pole

Repulsion:
North–North ➜ Push away
South–South ➜ Push away

Attraction:
North–South ➜ Pull towards each other

Important Rule:

  • Like poles repel each other.
  • Unlike poles attract each other.

🧲 G. Application-Based Questions

1️⃣ Why are magnets used in cranes?

Magnets in cranes help lift and move heavy iron objects easily from one place to another.
2️⃣ Why do maglev trains move without touching rails?

Due to magnetic repulsion, the train floats above the track. Since there is no friction, it moves very fast.
3️⃣ Why should magnets be stored carefully?

Magnets can lose their magnetism if heated, dropped, or broken. Using a magnet keeper helps protect them.

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