Science Week 12, Level G

22 Questions | Total Attempts: 38

Science Quizzes & Trivia

Questions and Answers
  • 1. 
    An object that attracts certain magnetic materials, such as iron and steel is called a [____________]. e.g. to identify black steel marbles from black glass marbles, use a magnet since a magnet can attract steel but it cannot attract glass
  • 2. 
    The end of each magnet is called magnetic [_____].
  • 3. 
    All magnets have [_____] different poles: a north pole noted N and a south pole noted S.
  • 4. 
    [_________] poles attract (pull) each other. [_______] poles repel (push away) each other.  The north pole of one magnet and the south pole of another magnet will [_______] each other.  The north pole of one magnet and the north pole of another magnet will [________] each other
  • 5. 
    The area around a magnet in which its magnetic effects can be observed is a [____________]. e.g. For an iron object to be attracted by a magnet it should be placed within the magnetic field of the magnet.
  • 6. 
    Since the magnetic field of a magnet cannot be seen, to locate it we sprinkle small bits of [_______] around the magnet
  • 7. 
    An electric wire carrying an electric current can produce a [________] magnetic field. To make the magnetic field produced by the wire stronger, wrap the wire around an iron nail.
  • 8. 
    When a wire that carries an electric current is wrapped around an iron rod, an [_________] is built.
  • 9. 
    The main difference between an electromagnet and a regular magnet is a regular magnet is [__________] while an [_____________] can be turned on and off.
  • 10. 
    When the number of coils around the iron rod is increased, the electromagnet becomes [________].
  • 11. 
    To increase the strength of electromagnet without changing the number of coils, we can increase the [______________] passing through the wire using a stronger battery.
  • 12. 
    When the current passing through the circuit is decreased, the electromagnet becomes [_______].
  • 13. 
    A strong [__________] is used to separate metal scraps from other materials in a junkyard
  • 14. 
    In a junkyard, an electromagnet is turned on to [_________] metals from a scrap pile, then it is turned off to [________] the metals into another pile (unlike a regular magnet that is always on).
  • 15. 
    An [_____________] is used to produce a ringing sound in an alarm bell
  • 16. 
    The electromagnet in an alarm bell moves the [_____________] that hits the bell repeatedly and fast.
  • 17. 
    An electromagnet is turned on to [___________] a hammer towards the metal ball and produce a sound, then it is turned off to repeat the cycle and produce a ringing sound.
  • 18. 
    A _________ circuit has a single pathway for the charges to flow through (the electric charges can pass through one path only).e.g. in the circuit below the devices of the circuit that receive current electricity are the three light bulbs
  • 19. 
    When a device is broken in a series circuit, it causes a ___________ in the electric path (all the bulbs will be off)
  • 20. 
    A circuit that has more than one path for the electric charges to flow through is a _________ _________. e.g. In the circuit below, the electric charges can pass through three paths.
  • 21. 
    We use __________ circuits to allow the devices to function separately (e.g. To control each lamp while not affecting the other)
  • 22. 
    When a device is broken in a __________ circuit, it does not affect the current in other devices
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