Fun with magnets Worksheet-2

Fun with magnets Worksheet-2

Multiple-Choice question:

11. A small iron bob is suspended vertically from a string. When a bar magnet is brought close to it, the iron bob swing towards the magnet (attracted) and the string assumes an inclined position. If a wooden bob is used in place of iron bob and then bar magnet is brought close to it, __________.

(a)  wooden bob is attracted towards the magnet and the string assumes an inclined position

(b)  wooden bob is unaffected by the presence of magnet and the string remains in vertical position

(c)  wooden bob is deflected in the opposite direction and the string assumes an inclined position

(d) None of these

12. _______ magnets are made from steel.   

(a) Electro            (b) Permanent    (c) Temporary     (d) None of these

13. Bar magnets have two poles. What are they?

(a) red and green                             (b) red and blue

(c) north and south                         (d) east and west

14. With increase in the distance between a magnet and an iron piece, the force of attraction ________.

(a) is unaffected                              (b) decreases

(c) increases                                     (d) None of these

15. What would you detect by using iron filings and iron objects?

(a) directions                                   (b) magnetic field

(c) gravity                                         (d) electricity

16. Where is the magnetic effect of a magnet strongest?

(a) At poles of the magnet

(b) Same at all the points inside the magnet

(c) At the centre of the magnet

(d) None of these

17. Like poles ________ each other while unlike poles ________ each other.

(a) repel, repel                                 (b) repel, attract

(c) attract, attract                            (d) attract, repel

18. If Magnet-A can hold 3 steel paperclips and Magnet-B of same size can hold 5 steel paperclips (similar), which one is a stronger magnet?

(a) magnets wouldn't attract steel paperclips

(b) they are equally strong

(c) magnet B

(d) magnet A

19. A horse shoe magnet is a strong magnet. What would happen if it is beaten to shape into a bar magnet?

(a) It may lose its strength due to striking

(b) The location poles will be interchanged

(c) It will become more stronger

20. If we suspend a magnet in air using a thread, it orients itself in north-south direction. Now, if we suspend magnet submerged in water, would it still orient itself in north-south direction?

(a) Yes, water does not affect its basic property of orienting itself in north-south direction

(b) No, as it loses magnetic property in water

(c) Magnet floats and cannot be submerged in water.

Answer Key:

11. (b)
12. (b)
13. (c)
14. (b)
15. (b)
16. (a)
17. (b)
18. (c)
19. (a)
20. (a)