Class 6 Science Chapter 10 Practice Question Answers - Fun with Magnets

Q1: Choose the wrong statement
(a) Heat can destroy the magnetic properties of magnets.
(b) Different magnets are made up of different materials and come in different shapes.
(c) There is a maximum attraction in the middle area of a magnet.
(d) Magnetite does not show any magnetic properties.
Ans: (d)
Magnetite does not show magnetic properties.

Q2: Choose the correct option in the following questions: Which is an example of a magnetic substance?
(a) Iron
(b) Cobalt
(c) Nickel
(d) All of these
Ans: (d)
All of these are attracted towards a magnet as all of them are metals.

Q3: Choose the correct option in the following questions: When a bar magnet is brought near iron dust, most of the dust sticks
(a) at the middle and ends
(b) equally everywhere
(c) near two ends
(d) near the middle
Ans: (c)
Magnetic field intensity is maximum at the poles of a bar magnet; hence most of the iron dust sticks to the poles.

Q4: What are magnets frequently used for?
Ans: Uses of magnets are listed below:

• Magnets are helpful in sorting out magnetic materials from heterogeneous mixtures
• Magnets are also used in electromagnetic devices for medical purposes like MRI scan machines.
• Electromagnets are also used in electric canes and speakers etc.
• Permanent magnets are used in permanent magnets like generators, electric vehicles and in the making of a mariner’s compass.

Q5: How do we determine the magnetic poles of the earth?
Ans: We can determine the magnetic poles of the earth in the following ways:

• Earth consists of 2 geographical poles, the north pole and the south pole.
• The North pole of the earth is Antarctica, and the south pole is named the arctic circle.
• Earth’s magnetic poles are located near each other but not exactly in the same place as geographical poles.
• A magnetic compass will always align its needle to the earth’s north pole.

Q6: Boojho dipped a bar magnet in a heap of iron filings and pulled it out. He found that iron filings got stuck to the magnet.
(i) Which regions of the magnet have more iron filings sticking to it?
(ii) What are these regions called?
Ans: (i) A magnet’s strength is concentrated in its ends. Hence its ends will contain more iron fillings concentration attached to them.
(ii) The ends of the magnet are called the North pole and the South pole, respectively.

Q7: Which arrangement is beneficial to store a U-shaped magnet? How is this different from storing a pair of bar magnets?
Ans: For storing a U-shaped magnet, a soft iron bar is placed on the tip of a U-magnet. To divide the bar magnets, which are placed in the same direction, a wooden block is placed between them. It is then stored in a wooden box. By following this method, the magnetic properties and strength of the magnet can be prolonged for a longer time.

Q8: What do you mean by magnetization?
Ans: Magnetisation is defined as the process of creating an artificial magnet with the help of a magnet. To transform a non-magnetic material into a magnet, firstly, we must place the non-magnetic material, for example, an iron nail, on a table. Then move a strong magnet along the lengths of the iron nail without any disruptions. We must move the magnet in the same direction around 40-50 times until the iron nail becomes magnetised.

Question 9: What are the precautions to be taken care of while handling magnets?
Ans: Precautions to be taken while handling magnets for ensuring their magnetic strength for a longer time duration are:

• Magnets are advised to be always stored in pairs with opposite poles facing each other.
• Magnets must never be fired, hammered or thrown from a great height. This will cause the magnetic property to weaken.
• A piece of the magnet must be kept across from horseshoe magnets to avoid weakening of its magnetism. 
• Magnets must be kept away from television, mobiles, CDs, laptops etc.

Q10: How is a compass used to find directions?
Ans: A compass always points in the north-south direction. The compass has a red arrow present in the compass, indicating the north direction. If we get to know the north direction, then we can easily find out the other direction.