Fun with magnets Worksheet-5

Fun with magnets Worksheet-5

 

True or False:

  1. Soft iron can be highly magnetized but the magnetism in it is temporary. 
  2. Magnets retain their magnetism even if they are strongly heated.   
  3. The magnetic equator is an imaginary line parallel to the magnetic axis.   
  4. Magnets are made of materials that attract objects made of certain substances such as iron, zinc, and nickel.
  5. Magnet was discovered by a Greek shepherd “Antonio”.
  6. Objects that are not attracted by magnet are said to be non-magnetic.
  7. The two magnetic poles: North and South can exist in isolation.
  8. The instrument in which a magnet is used to find directions is called a magnetic compass.
  9. Earth's magnetic north pole is geographic north pole.
  10. If a freely suspended magnet is allowed to rotate, it comes to rest such that its poles point in the Earth's north-south direction.
  11. Maglev had special arrangement of magnets that enabled the magnets to float over the track experiencing maximum mechanical friction.
  12. A piece of soft iron bar behaves like a electromagnet as long as the wire wound around it, carries current.
  13. All objects are not attracted to magnets.
  14. The magnetic compass always points in the east-west direction.       
  15. Temporary magnets retain their property for a long time.
  16. A magnet can lose its properties on hammering.
  17. A horseshoe magnet should be kept with a piece of soft iron towards its poles.
  18. Bar magnets should be kept in pairs, with unlike poles alongside each other.
  19. Computer hard discs, audio and video cassettes have magnetic material that stores information.
  20. Ancient Chinese sailors used magnets for navigation.
  21. Credit cards and ATM cards have a strip of magnetic material that stores information.
  22. Earth behaves as a giant bar magnet.

 

Answer Key:

  1. True
  2. False
  3. False
  4. False
  5. False
  6. True
  7. False
  8. True
  9. False
  10. True
  11. False
  12. True
  13. True
  14. False
  15. False
  16. True
  17. False
  18. True
  19. False
  20. True
  21. True
  22. True