Table of Contents
SECTION A: MULTIPLE CHOICE QUESTIONS (15 marks) #
Choose the correct answer for each question. Each question is worth 1 mark.
1. Which statement about magnetic poles is correct?
2. A magnet is brought near an iron nail. What happens to the nail?
3. Which of the following materials is magnetic?
4. What is induced magnetism?
5. A bar magnet is broken in half. What is the result?
6. Which material is used to make temporary magnets?
7. Which statement about steel magnets is correct?
8. A magnetic field is best defined as
9. The direction of a magnetic field at a point is
10. Magnetic field lines around a bar magnet
11. Iron filings are sprinkled around a magnet. Why do they form a pattern?
12. Where is the magnetic field around a bar magnet strongest?
13. Which of these is a use of permanent magnets?
14. Why is soft iron used as the core of an electromagnet?
15. Magnetic forces between two magnets are caused by
SECTION B: WRITTEN RESPONSE QUESTIONS (60 marks) #
Answer all questions in the spaces provided. Show all your working where required.
1. Two bar magnets are placed near each other. The north pole of the first magnet faces the north pole of the second magnet.
(a) State whether the magnets will attract or repel each other. [1 mark]
(b) Explain your answer to part (a). [2 marks]
(c) State what would happen if the second magnet was turned around so that its south pole faced the north pole of the first magnet. [1 mark]
(d) Explain your answer to part (c). [1 mark]
2. A student has three materials: an iron nail, a copper wire, and a steel paper clip.
(a) State which of these materials are magnetic. [2 marks]
(b) Describe a simple test the student could do to check if a material is magnetic. [2 marks]
(c) The student brings a bar magnet close to the iron nail. Explain what happens to the iron nail and why. [3 marks]
3. The table below compares soft iron and steel.
| Property | Soft Iron | Steel |
|---|---|---|
| Ease of magnetization | _______________ | Difficult |
| Ease of demagnetization | Very easy | _______________ |
| Type of magnet formed | _______________ | Permanent magnet |
| How long magnetism lasts | Very short time | _______________ |
(a) Complete the table by filling in the empty spaces. [4 marks]
(b) Explain why soft iron is used to make the core of an electromagnet rather than steel. [2 marks]
4. A teacher demonstrates magnetic fields using a bar magnet and a compass.
(a) Define the term “magnetic field”. [2 marks]
(b) State the direction of a magnetic field at any point. [2 marks]
(c) Describe the steps the teacher should follow to plot magnetic field lines using a compass. [5 marks]
5. A bar magnet has magnetic field lines around it.
(a) State the direction that magnetic field lines go outside a bar magnet. [1 mark]
(b) Explain why the magnetic field lines are closer together near the poles of the magnet. [2 marks]
(c) A student places a small plotting compass at a point near the north pole of the magnet. State which direction the north pole of the compass needle will point. [1 mark]
(d) Explain your answer to part (c). [2 marks]
6. A student wants to show the magnetic field pattern around a bar magnet using iron filings.
(a) Describe the procedure the student should follow. [4 marks]
(b) Explain why the iron filings arrange themselves in a pattern around the magnet. [3 marks]
(c) State one advantage of using iron filings instead of a compass to show the magnetic field pattern. [1 mark]
7. A magnet is used to pick up a chain of steel paper clips. Each paper clip touches the one below it, forming a vertical chain.
(a) Explain why the paper clips form a chain rather than falling off. [3 marks]
(b) Predict what will happen when the magnet is removed from the top paper clip. [1 mark]
(c) Explain your answer to part (b). [2 marks]
8. Give two uses for each type of magnet:
(a) Permanent magnets [2 marks]
(b) Electromagnets [2 marks]
(c) Explain why electromagnets are more useful than permanent magnets for scrapyard cranes that lift and move metal. [2 marks]
9. A student investigates how distance affects the strength of a magnetic field. She places a bar magnet on a table and uses a compass at different distances from the north pole.
(a) Predict what the student will observe as she moves the compass further away from the magnet. [2 marks]
(b) Describe how the spacing of magnetic field lines changes with distance from the magnet. [2 marks]
(c) Explain what the spacing of magnetic field lines tells us about the strength of the magnetic field. [2 marks]
10. Two students are discussing magnetic forces.
Student A says: “Magnets need to touch each other to exert forces.”
Student B says: “Magnetic forces are caused by interactions between magnetic fields.”
(a) State which student is correct. [1 mark]
(b) Explain why magnetic forces can act without the magnets touching each other. [3 marks]
(c) Give one piece of evidence from everyday life that shows magnetic forces can act at a distance. [1 mark]
END OF TEST
Total: 75 marks
