16.5 magnetism

Question 1 Which of the lists of metals below contains only metals which are non-ferrous?

• A iron, steel, nickel
• B cobalt, copper, steel
• C aluminium, brass, copper
• D iron, tin, aluminium

Question 2 Which of the following choices of metal would be suitable for: Use as a permanent magnet? Use as the core in an electromagnet? Use as a permanent magnet Use as the core of an electromagnet

• A steel iron
• B steel steel
• C iron iron
• D iron steel

Question 3 Which of the lists below are metals that are ferrous?

• A aluminium and iron
• B steel and iron
• C steel and lead
• D tin and iron

Question 4 Which statement about a permanent bar magnet is incorrect?

• A The S-pole attracts the N-pole of another magnet
• B The S-pole repels the S-pole of another magnet
• C It cannot repel a non-magnetic material
• D It is made from a soft magnetic material (such as soft iron)

Question 5 Which magnet has the strongest magnetic field?

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Question 6 A student makes a series of statements about a permanent bar magnet. Which of them is true?

• A The North pole of a permanent bar magnet will repel the North pole of another magnet.
• B A permanent bar magnet must be made from a soft magnetic material.
• C A permanent bar magnet can repel a magnetic material.
• D The field lines of a permanent bar magnet cross each other where the field is strongest.

Question 7 A student lines up some permanent magnets with soft iron nails in between as shown in the diagram below. What would the magnetic poles of locations X and Y be?

• A north north
• B north south
• C south north
• D south south

Question 8 Which of the following statements could be used to describe something a permanent magnet could do?

• A It will repel non-magnetic materials.
• B It will repel non-ferrous materials.
• C It will attract ferrous materials.
• D It will have a single magnetic pole.

Question 9 The diagram shows two bar magnets, stored with metal keepers across the ends. The keepers help to keep the magnets magnetised. The material used for the keepers becomes strongly magnetised when placed in contact with the magnets, but does not remain magnetised when taken away from the magnets. What is a suitable metal to use for the magnets and what is a suitable metal to use for the keepers? Metal for keeper Metal for magnet

• A steel steel
• B iron steel
• C steel iron
• D iron iron

Question 10 Which test could be used to find which end of a magnet is the south pole?

• A putting it near a ferrous metal
• B putting it near a compass needle and see whether the needle points towards the pole
• C putting it near a compass needle and see whether the needle points away from the pole
• D putting it near a non-ferrous metal