Primary 5 Science Magnets Quiz

TuitionGoWhere Primary School (AI)

Primary 5 Science - Magnets

Quiz 01 | Answer Key

Section A: Multiple Choice Questions (2 marks each)

1. C) Steel paper clip

Steel contains iron and is magnetic; aluminium, copper, and brass are non-magnetic metals

2. B) They attract each other

Unlike/opposite poles attract each other

3. B) Geographic North

The north pole of a magnet points towards Earth's magnetic north (geographic north)

4. B) The poles

Magnetic force is strongest at the poles of a magnet

5. C) Dropping it repeatedly on a hard surface

Hitting or dropping a magnet disturbs the alignment of magnetic domains, weakening or destroying magnetism

Section B: Fill in the Blanks (2 marks each)

6. magnetic

Materials attracted by magnets are called magnetic materials

7. repel ; attract

Like poles repel; unlike poles attract

8. compass

A compass needle is a small magnet that aligns with Earth's magnetic field

9. magnetic field

The magnetic field is the area around a magnet where magnetic force acts

10. temporary (or induced)

Stroking iron with a magnet temporarily magnetises it

Section C: Short Answer Questions (4 marks each)

11. (a) Both the iron nail and steel spoon contain iron, which is a magnetic material. Steel is an alloy made mainly of iron. (2 marks)

(b) Although copper is a metal, it is not a magnetic material. Only iron, steel, nickel, and cobalt are attracted to magnets. Being a metal does not automatically make something magnetic. (2 marks)

12. (a) The magnets will attract each other and move towards each other because unlike poles (S and S facing... wait, let me re-read: Magnet A has S facing Magnet B which has S facing back).

Actually from the diagram: Magnet A's S pole faces Magnet B's S pole. They will repel each other and move apart because like poles (S-S) repel. (2 marks)

(b) If both north poles face each other, the magnets will repel each other because like poles repel. (2 marks)

13. To make a temporary magnet:

• Place the iron nail on a flat surface
• Stroke the iron nail with one pole of the bar magnet repeatedly in the same direction (about 30-50 times)
• Lift the magnet away from the nail at the end of each stroke before bringing it back to the starting point
• The nail will become magnetised

It is called a "temporary" magnet because it will gradually lose its magnetism over time, especially when dropped or heated. The magnetic domains in iron do not stay aligned permanently. (4 marks)

Section D: Structured Questions (5 marks each)

14. (a) Magnet B is the strongest because it picked up the most paper clips (15). The stronger the magnet, the more magnetic material it can attract and hold. (2 marks)

(b) Variables to keep constant:

• Use the same type and size of paper clips
• Start from the same distance/position
• Use the same part of the magnet (e.g., the pole)
• Same environmental conditions (no interference from other magnets) (1 mark each, any 2 correct)

(c) Other methods to compare magnet strength:

• Measure the distance at which each magnet can attract a paper clip
• Measure the force needed to pull a paper clip away from each magnet
• See which magnet can attract through more sheets of paper (1 mark for any valid method)

15. (a) Magnetic field lines travel from the north pole to the south pole outside the magnet. (1 mark)

(b) The magnetic field is strongest at the poles. This can be seen from the field lines because the field lines are closest together (most concentrated) at the poles. Where lines are closer together, the field is stronger. (2 marks)

(c) The iron filings would:

• Be attracted to the magnet and arrange themselves along the magnetic field lines
• Cluster most densely at the poles where the magnetic field is strongest
• Form a pattern showing the shape of the magnetic field (2 marks)

Section E: Higher-Order Thinking (5 marks)

16. (a) Procedure to separate iron filings from sand:

• Wrap the bar magnet in paper
• Move the wrapped magnet through the mixture (or hover it close to the mixture)
• The iron filings will be attracted to the magnet and stick to the paper
• Pull the magnet away from the mixture and remove the paper to collect the iron filings separately
• Repeat until all iron filings are removed (2 marks)

(b) The paper makes it easier to remove the iron filings from the magnet. Without paper, the iron filings would stick directly to the magnet and be difficult to remove. With paper, you simply remove the magnet from inside the paper and the filings fall off. (1 mark)

(c) No, this method cannot be used to separate aluminium filings from sand because aluminium is not a magnetic material. Aluminium is not attracted to magnets, so the magnet would not be able to pick up the aluminium filings from the sand. (2 marks)

Marking Scheme

End of Answer Key