Fun With Magnets Worksheet

Objective Type Questions

1. Answer in one word:
   In which country, the magnetite was first discovered?
   
   
2. Match the following:
   
   
   
3. Find odd one out:
   Iron, magnetite, nickel, cobalt
   
   
4. State whether the statement is true or false:
   For horseshoe magnet, a piece of soft iron should be kept across the poles. 
   
   Multiple Choice Questions
   
   
5. Which of the following are the magnetic poles? 
   (a) East and West
   (b) West and South
   (c) East and North
   (d) North and South 
   
   
6. When magnet is brought near the iron filings, most of the filings are attracted by     
   (a) both the poles of magnet
   (b) middle of magnet
   (c) north pole of magnet
   (d) fillings are equally distributed over the magnet 
   
   
7. Ram performs an experiment with help of the below given materials and magnet. Which of them can be termed to be magnetic materials? 
   
   (a) (i), (ii), (iv)
   (b) (i) and (iv)
   (c) (ii), (iii), (iv)
   (d) (i), (iv) and (v)
   
   
8. Magnets do not lose their properties when ___
   (a) Heated
   (b) Hammered
   (c) Dropped from height.
   (d) Soft iron is placed across their ends.
   
   
9. How many poles will be formed if two magnets are cut into two pieces each? 
   
   (a) 4
   (b) 6
   (c) 8
   (d) 10
   
   Subjective Questions
   
   
10. When was magnetite discovered? 
    
    
11. Identify the device based on its image: 
    (a) 
    
    (b)
    
    
    
12. Sahil has a bar magnet whose poles are known to him. Provide step – by – step procedure which will help him to identify the poles of the magnet. 
    
    
13. Safety pins attract both poles of a magnet. What conclusion do you draw from this observation?
    
    
14. What is the method of storing bar magnets? 
    
    
15. Rohit is provided with a bar magnet and material “X”. Material “X” attracts the bar magnet when one of its ends is brought near one of the poles of bar magnet. Using the provided magnet, how can he determine whether material "X" is a magnet or not?   
    
    
16. Enlist all the properties of a magnet.  
    
    
17. Name any two objects which can be used to make an artificial magnet. 
    
    Assertion-Reasoning Questions
    
    Below questions consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:
    
    
    
18. Assertion: North pole of one magnet will repel north pole of another magnet. 
    Reason: Like poles attract each other.    
    
    
19. Assertion: The magnetised needle inserted inside cork and left to float in a water bowl can be used to determine the direction. 
    Reason: The magnet always points in north-south direction. 
    
    Case-Based Questions
    
    
20. Rahul is performing an experiment with a magnet and an iron nail. He rubs a magnet across an iron nail 40 times from left to right, lifting each time when he reaches the tip of it. Upon completion, he brings the iron filings near it and notes his 1^st  observation. Next, he holds the iron nail with pair of tongs and heats it over the flame for some time. Once again, he brings the iron filings near the heated iron nail and notes down his 2^nd observation. Answer the below questions: 
    
    (a) What happens to the iron nail when Rahul rubs it over by the magnet?
    (b) What will be the 1^st observation of the experiment?
    (c) What will be the 2^nd observation of the experiment?
    (d) What is the reason for the second observation?

Objective Type Questions

1. Answer in one word:
   In which country, the magnetite was first discovered?
   
   Solution: Greece. 
   
   
2. Match the following:
   
   
   Solution:
   
   
   
3. Find odd one out:
   Iron, magnetite, nickel, cobalt
   
   Solution: Magnetite
   Others are magnetic materials and magnetite is a natural magnet.
   
   
4. State whether the statement is true or false:
   For horseshoe magnet, a piece of soft iron should be kept across the poles. 
   
   Solution: True.
   
   Multiple Choice Questions
   
   
5. Which of the following are the magnetic poles? 
   (a) East and West
   (b) West and South
   (c) East and North
   (d) North and South 
   
   Correct option: (d)North and South
   Solution: North pole and south pole are two magnetic poles.
   
   
6. When magnet is brought near the iron filings, most of the filings are attracted by     
   (a) both the poles of magnet
   (b) middle of magnet
   (c) north pole of magnet
   (d) fillings are equally distributed over the magnet 
   
   Correct option: (a) both the poles of magnet
   Solution: When magnet is brought near the iron fillings, most of the fillings are attracted by both the poles of magnet.
   
   
7. Ram performs an experiment with help of the below given materials and magnet. Which of them can be termed to be magnetic materials? 
   
   (a) (i), (ii), (iv)
   (b) (i) and (iv)
   (c) (ii), (iii), (iv)
   (d) (i), (iv) and (v)
   
   Correct option: (b) (i) and (iv)
   Solution: Among the given options key and nail will be attracted by magnet. Thus, key and nail are the magnetic materials.
   
   
8. Magnets do not lose their properties when ___
   (a) Heated
   (b) Hammered
   (c) Dropped from height.
   (d) Soft iron is placed across their ends.
   
   Correct option: (d) Soft iron is placed across their ends
   Solution:  Magnets do not lose their properties when soft iron piece is placed across their ends. Magnets loses their properties when heated, hammered or dropped from certain height.
   
   
9. How many poles will be formed if two magnets are cut into two pieces each? 
   
   (a) 4
   (b) 6
   (c) 8
   (d) 10
   
   Correct option: (c) 8
   Solution: We know that poles of magnet can never be separated. Thus, when two magnets are cut into two pieces each, we will get 4 magnets and thus 8 poles will be formed.
   
   Subjective Questions
   
   
10. When was magnetite discovered? 
    
    Solution: Magnetite was discovered around 800 B.C.
    
    
11. Identify the device based on its image: 
    (a) 
    
    (b)
    
    
    Solution:
    (a) Bar magnet
    (b) Magnetic compass
    
    
12. Sahil has a bar magnet whose poles are known to him. Provide step – by – step procedure which will help him to identify the poles of the magnet. 
    
    Solution:
    Sahil must perform following steps to determine the south pole and north pole of magnet:
    
    (a) Magnet should be tied by a thread as shown in the diagram.
    (b) The magnet should be suspended free from the fixed support. 
    (c) The end which points towards the geographic north pole is the north pole of magnet and the one which points towards the geographic south pole is the south pole of magnet.
    
    
13. Safety pins attract both poles of a magnet. What conclusion do you draw from this observation?
    
    Solution:
    Safety pins are made from steel which is a magnetic material and is thus attracted by both the poles of magnet.
    
    
14. What is the method of storing bar magnets? 
    
    Solution:
    Bar magnets are kept in pairs with their unlike poles on same side and separated by a piece of wood while two pieces of soft iron are placed across their ends.
    
    
15. Rohit is provided with a bar magnet and material “X”. Material “X” attracts the bar magnet when one of its ends is brought near one of the poles of bar magnet. Using the provided magnet, how can he determine whether material "X" is a magnet or not?   
    
    Solution:
    Repulsion is sure test for magnetism. It is given that one end of material ‘X’ is attracted by one pole of bar magnet. If same end of material ‘X’ gets repelled by the other pole of the given bar magnet, then material ‘X’ is a magnet but if it attracts another pole then it is a magnetic material.
    
    
16. Enlist all the properties of a magnet.  
    
    Solution:
    (i)The freely suspended magnet always rests in north – south direction.
    (ii)Magnetic strength is greater at poles than at the centre of magnet.
    (iii)Two poles of magnet can never be separated. 
    (iv)Like poles repel each other while unlike pole attract each other.  
    
    
17. Name any two objects which can be used to make an artificial magnet. 
    
    Solution:
    Iron nail and needle
    
    Assertion-Reasoning Questions
    
    Below questions consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:
    
    
    
18. Assertion: North pole of one magnet will repel north pole of another magnet. 
    Reason: Like poles attract each other.    
    
    Correct option: (c) A is true, but R is false.
    Solution: Like poles repel each other. Thus, north pole of one magnet repels north pole of another magnet.
    
    
19. Assertion: The magnetised needle inserted inside cork and left to float in a water bowl can be used to determine the direction. 
    Reason: The magnet always points in north-south direction. 
    
    Correct option: (a) Both A and R are true, and R is the correct explanation of A.
    Solution: The needle which is magnetised will acquire all the properties of magnet and thus can be used to determine the directions.
    
    Case-Based Questions
    
    
20. Rahul is performing an experiment with a magnet and an iron nail. He rubs a magnet across an iron nail 40 times from left to right, lifting each time when he reaches the tip of it. Upon completion, he brings the iron filings near it and notes his 1^st  observation. Next, he holds the iron nail with pair of tongs and heats it over the flame for some time. Once again, he brings the iron filings near the heated iron nail and notes down his 2^nd observation. Answer the below questions: 
    
    (a) What happens to the iron nail when Rahul rubs it over by the magnet?
    (b) What will be the 1^st observation of the experiment?
    (c) What will be the 2^nd observation of the experiment?
    (d) What is the reason for the second observation?
    
    Solution:
    (a) Iron nail becomes magnetised (or acquire the magnetic properties) when Rahul rubs the iron nail with magnet repeatedly.
    (b) As iron nail behaves like a magnet, iron filings get attracted towards it.
    (c) In 2^nd observation, iron filings will not get attracted towards the iron nail.
    (d) Due to heating, iron nail loses all the acquired magnetic properties and thus iron filings do not get attracted towards it.