Primary 4 Science Magnets Quiz

TuitionGoWhere Primary School (AI)

Primary 4 Science - Magnets Quiz 01

Name: _________________________ Date: _____________

Class: _________________________ Score: ______ / 15

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Section A: Multiple Choice Questions (1 mark each)

1. Which of the following materials can be magnetised?

A) Plastic
B) Wood
C) Iron
D) Aluminium

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2. If you cut a bar magnet in half, what will you get?

A) One piece with North pole only
B) One piece with South pole only
C) Two smaller magnets, each with North and South poles
D) Two non-magnetic pieces

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3. What is the region around a magnet where magnetic force can be felt called?

A) Magnetic field
B) Magnetic force
C) Magnetic pole
D) Magnetic energy

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4. A compass needle points North because:

A) The Earth has a magnetic field
B) The needle is painted red
C) The compass is made of plastic
D) The needle is heavy

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5. Which statement about magnetic poles is TRUE?

A) All magnets have only one pole
B) Like poles attract each other
C) Unlike poles repel each other
D) Every magnet has both a North and South pole

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Section B: Short Answer Questions (2 marks each)

6. Name three magnetic materials.

Answer: _____________________________________________

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7. How would you make a temporary magnet using a permanent magnet and an iron nail?

Answer: ___________________________________________________

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8. Why does a compass not work well near electrical devices or other magnets?

Answer: ___________________________________________________

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9. List two uses of magnets in everyday life.

Answer: _____________________________________________

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10. Describe what magnetic field lines look like around a bar magnet.

Answer: ___________________________________________________

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Section C: Application Questions (2 marks each)

11. John placed a magnet near his computer. His father told him not to do this. Why?

Answer: ___________________________________________________

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12. Explain how electromagnets are different from permanent magnets.

Answer: ___________________________________________________

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13. A magnetic crane is used in a junkyard. Explain how it works to separate metals.

Answer: ___________________________________________________

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14. Why can magnetic force pass through some materials like paper and glass?

Answer: ___________________________________________________

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15. Two bar magnets are placed near each other. They repel each other. Draw a simple diagram showing how the magnets are positioned (label the poles).

Answer:

[Space for drawing]

Explanation: _______________________________________________

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End of Quiz

TuitionGoWhere Primary School (AI)

Primary 4 Science - Magnets Quiz 01 - Answer Key

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Section A: Multiple Choice Questions (1 mark each)

1. C) Iron
Iron is a magnetic material that can be magnetised. Plastic, wood, and aluminium are non-magnetic.

2. C) Two smaller magnets, each with North and South poles
When a magnet is cut, each piece becomes a complete magnet with both poles.

3. A) Magnetic field
The magnetic field is the region where magnetic force can be detected.

4. A) The Earth has a magnetic field
The Earth acts like a giant magnet, and the compass needle aligns with Earth's magnetic field.

5. D) Every magnet has both a North and South pole
All magnets are dipoles, meaning they always have both North and South poles.

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Section B: Short Answer Questions (2 marks each)

6. Any three of: iron, steel, nickel, cobalt
Award 2 marks for 3 correct, 1 mark for 2 correct.

7. Stroke the iron nail in one direction repeatedly with one pole of the permanent magnet. After many strokes, the nail will become a temporary magnet.
Award 2 marks for correct method (one direction, repeated strokes).

8. Electrical devices create their own magnetic fields, and other magnets have magnetic fields that can interfere with the compass. This affects the compass needle's ability to align with Earth's magnetic field accurately.
Award 2 marks for explaining magnetic interference.

9. Any two of:

• Refrigerator door magnets
• Magnetic door catches
• Speakers/headphones
• Motors
• Hard drives
• Magnetic toys
• MRI machines

Award 1 mark for each correct use.

10. Magnetic field lines:

• Come out from the North pole and enter the South pole
• Form closed loops
• Are closest together at the poles (where the field is strongest)
• Never cross each other

Award 2 marks for correct description.

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Section C: Application Questions (2 marks each)

11. Magnets can damage electronic devices like computers. The magnetic field can erase or corrupt data stored on the computer's hard drive, and can also affect the display screen.
Award 2 marks for explaining damage to data/electronics.

12. Electromagnets:

• Are made by passing electric current through a coil of wire
• Can be turned on and off by controlling the current
• Strength can be adjusted

Permanent magnets:

• Are always magnetic
• Cannot be turned off
• Strength is constant

Award 2 marks for explaining at least 2 differences.

13. The magnetic crane uses a large electromagnet. When the current is turned on, the electromagnet attracts magnetic metals like iron and steel. The crane lifts these metals. When the current is turned off, the magnetism disappears and the metals drop. Non-magnetic metals like aluminium are left behind.
Award 2 marks for explaining electromagnet operation.

14. Paper and glass are non-magnetic materials. Magnetic force can pass through non-magnetic materials because the field lines are not affected by these materials. Only magnetic materials interact with and can block magnetic fields.
Award 2 marks for explaining that non-magnetic materials don't block magnetic force.

15. Diagram should show:

[N]---[S]     [N]---[S]
        ←→
     (repelling)

OR

[S]---[N]     [S]---[N]
        ←→
     (repelling)

Explanation: Like poles (N-N or S-S) facing each other repel.
Award 1 mark for correct diagram, 1 mark for explanation.

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Marking Scheme Summary

• Section A: 5 marks (5 questions × 1 mark)
• Section B: 10 marks (5 questions × 2 marks)
• Section C: 10 marks (5 questions × 2 marks)
• Total: 25 marks

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End of Answer Key