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Class 6 Science Chapter 4 Lets Play With Magnets
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Lets Play With Magnets
Chapter: 4
PART – I
EXERCISE
1. Fill in the blanks.
(a) Materials that are attracted by magnet are called ____________.
Ans: Magnetic materials.
(b) Magnets made artificially for various purposes are called _________ magnet.
Ans: Artificial magnets.
(c) Rubber is not a ___________ substance.
Ans: Magnetic.
(d) If we break a bar magnet equally into two pieces, we will get ___________ magnets.
Ans: Two.
(e) Similar poles of two magnets ___________ each other.
Ans: Repel.
(f) Magnets always have _____________ poles.
Ans: Two.
2. Put tick mark (✔) for correct statements.
(a) Magnets attract all kinds of objects.
Ans: ✘.
(b) There is attraction between the opposite ends of a magnet.
Ans: ✔.
(c) Cobalt is a magnetic substance.
Ans: ✔.
(d) The bar magnet always remains facing in north-south direction.
Ans: ✔.
(e) Magnets lose their magnetic properties when heated.
Ans: ✔.
3. Match column A with column B.
| Column A | Column B |
| (i) Compass | (a) The first magnet discovered |
| (ii) Iron nails | (b) The magnetic property remains for a long time |
| (iii) Magnetite | (c) Is attracted by a magnet |
| (iv) Permanent magnet | (d) At steady state ,it remains in north-south direction. |
Ans:
| Column A | Column B |
| (i) Compass | (d) At steady state, it remains in north – south direction. |
| (ii) Iron nails | (c) Is attracted by a magnet |
| (iii) Magnetite | (a) The first magnet discovered. |
| (iv) Permanent magnet | (b) The magnetic property remains for a long time. |
4. Column-1 shows the position of one end of the magnet. Column 2 shows the action in each case. Now fill in the blanks.
| Column – 1 | Column – 2 |
| North – North | _______ |
| North – _____ | Attraction |
| South – North | ________ |
| _____ – South | Repulsion |
Ans:
| Column – 1 | Column – 2 |
| North – North | Repulsion |
| North – South | Attraction |
| South – North | Attraction |
| South – South | Repulsion |
5. Darken the circle of correct answer.
(i) Which of the following is a magnetic substance?
(a) Alpin.
(b) Rubber.
(c) Plastic bangle.
(d) Wooden scale.
Ans: (a) Alpin.
(ii) Which of the following in a non-magnetic substance?
(a) Iron nail.
(b) Rubber band.
(c) Safety pin.
(d) Alpin.
Ans: (b) Rubber band.
(iii) How many poles are there in a magnet?
(a) Two.
(b) One.
(c) Three.
(d) Four.
Ans: (a) Two.
6. If a bar magnet is brought near to iron powder, in which part of the magnet will the iron powder stick least.
Ans: The magnetic strength of a bar magnet is the strongest at its poles (North and South) and the weakest at the center. Therefore, the iron powder will accumulate more at the poles and the least at the center.
7. The poles of a bar magnet are not marked. How do you find out its north pole?
Ans: To find the North pole of an unmarked bar magnet, suspend it freely using a thread so it can rotate without obstruction. After settling, the end that points towards the geographic North is the magnet’s North pole. This happens because a freely suspended magnet always aligns itself in the North-South direction due to the Earth’s magnetic field.
8. Can we get a magnet with unit pole ?
Ans: No, we cannot get a magnet with a unit pole. Every magnet always has both a north and a south pole, even if it is broken.
9. Write down any two properties of magnet.
Ans: The two properties of magnet are:
(i) The two ends of the magnet are called the poles of the magnet. One of these poles is north pole and the other is the south pole.
(ii) A freely suspended magnet always points in the North-South direction.
10. How do you convert an iron nail into a magnet?
Ans: Rub a strong bar magnet repeatedly over the nail in one direction to align its magnetic domains. The nail then becomes a magnet.
11. Why does a bar magnet remain in north-south direction when suspended freely?
Ans: Because the Earth acts like a giant magnet, the suspended magnet aligns itself with Earth’s magnetic field, pointing north-south.
12. How is a compass used to determine direction?
Ans: The compass needle is a small magnet that aligns in the north-south direction, with the north pole marked red. This helps identify the other directions.
13. How would you identify the two poles of a horseshoe magnet?
Ans: Sprinkle iron filings on the magnet. The filings cluster more at the poles. Alternatively, use a compass near each pole to detect the north and south poles.
14. You are given a bar magnet, a small plastic scale, a piece of wood and a nail. Which of these can you convert into a magnet and how? How do you come to know that it becomes a magnet?
Ans: Only the iron nail can be magnetized by rubbing a magnet on it. It becomes a magnet if it can attract small iron pieces.
15. You are given a bar magnet and some alpins. How do you determine the two poles of it?
Ans: Bring each end of the magnet near the alpin. The end of the alpin attracted to the magnet’s north pole is its south pole and vice versa.
16. You are given a bar magnet and a compass. The poles are not marked on the magnet. How will you mark the poles of the magnet with the help of the compass?
Ans: Bring the magnet near the compass needle. The end of the magnet repelling the compass needle’s north pole is the magnet’s north pole.
17. A needle made of steel falls on the floor, you can’t lift it up with your hands. How can you lift the needle up?
Ans: Use a magnet to attract and lift the needle.
18. Suppose you are visiting a new place. You have a compass with you. How will you determine the directions of the place?
Ans: Place the compass on a flat surface. The needle points north-south. The end pointing north helps identify east, west, and south.
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