Magnetism

24 Grade 7 Integrated Science questions on Magnetism, with worked marking schemes. 24 questions are available on this topic in full.

1. Question 1

   4 marks

   A learner keeps two bar magnets on a shelf.

   (a) State TWO ways of storing magnets to prevent them from losing their magnetism.

   (b) State ONE everyday use of magnets.

   (4 marks)

   Marking scheme

   (a) Any 2 for 1 mark each: store them in pairs with unlike poles together and soft-iron keepers across the ends; keep them away from heat/fire; avoid dropping or hammering them; keep away from strong electric currents/other magnets. (b) Any 1 for 1 mark: used in compasses; in loudspeakers; in electric bells; on fridge doors; in dynamos/motors; for lifting/sorting scrap iron; magnetic door catches.

2. Question 2

   1 mark

   A learner drops a bar magnet on a hard floor several times. What is likely to happen to the magnet?

   A. It changes into an electromagnet

   B. It loses some of its magnetism

   C. It becomes a stronger magnet

   D. It gains an extra pole

   (1 mark)

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3. Question 3

   2 marks

   State the law of magnetism.

   (2 marks)

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4. Question 4

   1 mark

   Magnets can be demagnetised by

   A. heating, hammering, or dropping them

   B. placing them in water

   C. wrapping them in cloth

   D. painting them

   (1 mark)

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5. Question 5

   5 marks

   A bar magnet has two poles.

   (a) Name the two poles of a bar magnet. (2 marks)

   (b) State what happens when the north pole of one magnet is brought close to the north pole of another magnet. (1 mark)

   (c) Name two materials that are attracted by a magnet. (2 marks)

   (5 marks)

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6. Question 6

   4 marks

   During an experiment on properties of magnets, a learner brought magnet 1 close to the N-pole of magnet 2. Magnet 2 moved away.

   (a) Identify the pole of magnet 1 that was brought close to magnet 2. (1 mark)

   (b) Give a reason for your answer in (a) above. (1 mark)

   (c) State two uses of magnets in everyday life. (2 marks)

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7. Question 7

   1 mark

   A learner brings a bar magnet close to several objects. Which of the following materials will be attracted to the magnet?

   A. A plastic ruler

   B. An iron nail

   C. A wooden pencil

   D. A copper coin

   (1 mark)

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8. Question 8

   3 marks

   State the law of magnetism concerning magnetic poles, and give ONE example of how it can be demonstrated using two bar magnets.

   (3 marks)

   Marking scheme

   Law: like poles repel and unlike poles attract (2 marks — 1 for each part). Example (1 mark): bringing the north pole of one magnet near the north pole of another causes them to push apart/repel; OR bringing a north pole near a south pole causes them to attract/pull together.

9. Question 9

   1 mark

   Learners placed a box containing an unknown object near a bar magnet. The box moved towards the magnet. The object was likely

   A. a wooden block

   B. an iron nail

   C. a plastic toy

   D. a rubber ball

   (1 mark)

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10. Question 10

    1 mark

    When the north pole of one magnet is brought near the north pole of another magnet, they will

    A. stick together

    B. repel each other

    C. have no effect

    D. attract each other

    (1 mark)

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11. Question 11

    4 marks

    A learner has a mixture of iron filings and sand and wants to separate them.

    (a) Name the property of iron that makes separation possible.

    (b) Describe how the learner can use a magnet to separate the mixture.

    (4 marks)

    Marking scheme

    (a) Iron is a magnetic material / is attracted by a magnet (1 mark). (b) Move/pass a magnet over the mixture (1 mark); the iron filings are attracted and cling to the magnet (1 mark) while the sand is left behind, so the two are separated (1 mark).

12. Question 12

    1 mark

    A magnet attracts materials made of

    A. iron, steel, nickel and cobalt

    B. wood, plastic and glass

    C. rubber, paper and cloth

    D. gold, silver and copper

    (1 mark)

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13. Question 13

    1 mark

    A compass needle is a small magnet. It is used to find

    A. direction

    B. temperature

    C. mass

    D. volume

    (1 mark)

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14. Question 14

    4 marks

    (a) State two properties of a magnet. (2 marks)

    (b) A learner brings the north pole of one bar magnet close to the north pole of another bar magnet. State and explain what is observed. (2 marks)

    (4 marks)

    Marking scheme

    (a) Any two of: a magnet attracts magnetic materials (e.g. iron, steel, nickel, cobalt); a magnet has two poles, a north pole and a south pole; when freely suspended it comes to rest pointing in the north-south direction; like poles repel and unlike poles attract; the magnetic force is strongest at the poles. (2 marks) (b) The two magnets repel (push away from) each other. This is because like poles repel; both poles being north poles are alike, so they exert a repulsive force on each other. (2 marks)

15. Question 15

    3 marks

    A learner suspends a bar magnet freely and observes that it always settles pointing in a fixed direction.

    (a) In which direction does the magnet come to rest?

    (b) State ONE practical application of this behaviour of a freely suspended magnet.

    (3 marks)

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16. Question 16

    1 mark

    A magnet is freely suspended by a thread and allowed to come to rest. In which direction does one end of the magnet always point?

    A. Straight downwards

    B. North–south direction

    C. East–west direction

    D. Towards the nearest wall

    (1 mark)

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17. Question 17

    1 mark

    Which of the following materials is magnetic?

    A. Wooden stick

    B. Iron nail

    C. Glass marble

    D. Plastic spoon

    (1 mark)

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18. Question 18

    4 marks

    (a) State two properties of a magnet. (2 marks)

    (b) A bar magnet is brought near three materials: iron nail, copper coin and plastic ruler. State which of these materials will be attracted by the magnet and give a reason. (2 marks)

    (4 marks)

    Marking scheme

    (a) Any two of: a magnet has two poles (north and south); like poles repel and unlike poles attract; a freely suspended magnet comes to rest pointing in the north-south direction; a magnet attracts magnetic materials (e.g. iron). (2 marks) (b) The iron nail will be attracted because iron is a magnetic material; the copper coin and plastic ruler are not attracted because copper and plastic are non-magnetic materials. (2 marks)

19. Question 19

    1 mark

    When the north pole of one magnet is brought close to the north pole of another magnet, what happens?

    A. They repel each other

    B. Nothing happens at all

    C. They attract each other

    D. They stick together strongly

    (1 mark)

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20. Question 20

    1 mark

    The ends of a magnet are called

    A. nodes

    B. electrodes

    C. poles

    D. terminals

    (1 mark)

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21. Question 21

    1 mark

    A freely suspended bar magnet comes to rest pointing in the

    A. east-west direction

    B. any random direction

    C. north-south direction

    D. north-east direction

    (1 mark)

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22. Question 22

    1 mark

    A bar magnet is dipped into a box of iron filings. At which part of the magnet do the MOST iron filings cling?

    A. The whole magnet equally

    B. The painted surface only

    C. The poles (ends)

    D. The middle

    (1 mark)

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23. Question 23

    4 marks

    (a) Name two materials that are attracted by a magnet. (2 marks)

    (b) State what happens when the north pole of one magnet is brought near the north pole of another magnet. (1 mark)

    (c) Give one use of a magnet in everyday life. (1 mark)

    (4 marks)

    Marking scheme

    (a) Any two magnetic materials: iron, steel, nickel, cobalt. (1 mark each) (b) The two north poles repel each other (push away), because like poles repel. (1 mark) (c) Any one of: in compasses for direction; in fridge magnets/door catches; in loudspeakers; in electric motors; for picking up/sorting iron objects (scrap separation). (1 mark)

24. Question 24

    1 mark

    Which of the following is the BEST method a learner can use to make a steel bar into a magnet?

    A. Painting it with red and blue colours

    B. Rubbing it with a dry cloth

    C. Stroking it in one direction with a magnet

    D. Placing it in warm water

    (1 mark)

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