Fun With Magnets

Fun with magnets Worksheet-1

Multiple-Choice question:

1. Who among the following used lodestone for navigation in sea (compass)?

(a) The Japanese, about 4000 years ago

(b) The Chinese, about 3000 years ago

(c) The Swedish, about 5000 years ago

(d) The Dutch, about 2500 years ago

2. Which of the following statements is not true about poles of a magnet?

(a) North pole of a magnet is attracted towards south pole of other magnet.

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

Fun with magnets Worksheet-3

Multiple-Choice question:

21. What would happen if a powerful magnet is rubbed slowly again and again against an aluminum piece?

(a) A magnet will get demagnetized

(b) That piece will get magnetized

(c) No effect

22. Can we give a desired shape to natural magnets?

(a) Yes, we can create natural magnet of any shape

(b) No, hammering or striking may damage magnets

(c) Can’t say