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Science 4.Unit 6.1-6.3: Electricity

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  • What happens to a bulb if an insulator is placed in the circuit?
    It lights up brighter
    It breaks
    It flashes
    The bulb doesn’t light up
  • What is the role of insulators in plugs?
    To protect users from current
    To increase voltage
    To make the plug heavier
    To help electricity flow
  • What property do all good electrical conductors have?
    They are light in weight
    They allow electric current to pass easily
    They are flexible
    They are colorful
  • Which part of a kettle is an insulator?
    The metal base
    The plug pins
    The handle
    The heating element
  • Why are screwdrivers for electricians covered with rubber?
    Rubber is magnetic
    Rubber is heavy
    Rubber is shiny
    Rubber insulates from electric shock
  • Which of these materials can conduct electricity when dissolved in water?
    Oil
    Baking powder
    Salt
    Sugar
  • What is the main function of an insulator?
    To stop electrical current
    To store electricity
    To change electricity to light
    To increase electrical flow
  • Why is it dangerous to use damaged electrical cords?
    They reduce electricity
    Wires may be exposed and cause shocks
    They don’t look nice
    They make noise
  • Which situation is the most dangerous?
    Charging a laptop
    Using a phone while charging in the bathtub
    Switching on a fan
    Turning off a light
  • Why is plastic used on the handle of screwdrivers used in electrical work?
    It insulates against electricity
    It is lighter
    It is more expensive
    It is more colorful
  • Which metal is commonly used in electrical circuits?
    Zinc
    Copper
    Silver
    Gold
  • What is the result of touching an exposed conductor?
    It lights up
    Nothing happens
    You can get shocked
    It beeps
  • What happens when a conductor is placed in a closed circuit?
    Electricity flows
    Electricity stops
    Wire melts
    Bulb breaks
  • Why are electrical sockets made from insulating materials?
    To improve appearance
    To prevent electric shock
    To improve heat conduction
    To reduce cost
  • Tap water conducts electricity because it contains...
    Dissolved salts and minerals
    Chlorine only
    Bacteria
    Oil and fats
  • Which part of a wire is the conductor?
    The plastic coating
    The metal core
    The outer jacket
    The label
  • Which of these are insulators?
    Oil
    Tap water
    Silver
    Metal
  • Materials made of ceramic, plastic and cork are electrical _____.
    conductors
    insulators
  • Which statement is TRUE about insulators?
    They stop electricity from passing through
    They generate electricity
    They speed up electric current
    They are all metallic
  • What is an example of a poor conductor?
    Aluminum
    Iron
    Wood
    Steel
  • Why should electrical appliances have insulating handles?
    To make them attractive
    To conduct heat
    To protect users from electric shock
    To make them lighter
  • What is the best way to test whether a material conducts electricity?
    Put it in water
    Complete a circuit and see if a bulb lights up
    Use a magnet
    Touch it with wet hands
  • Why is metal used in wires?
    Because it is heavy
    Because it looks shiny
    Because it conducts electricity
    Because it's cheap
  • Which set of objects cannot conduct electricity?
    plastic spoon, metal fork, cork
    wooden toy, glass, coin
    book, cork, ceramic bowl
    key, paper cup, cork
  • Why is the metal part of a plug not covered?
    It is cheaper
    It needs to conduct electricity
    It prevents damage
    It looks better
  • A conductor is most likely made from which of these?
    Metal
    Glass
    Paper
    Plastic
  • Which of these would make a circuit incomplete?
    Copper wire
    Plastic spoon
    Steel pin
    Iron nail
  • What is a conductor?
    A material that blocks electricity
    A device that stores electricity
    A battery
    A material that allows electricity to flow through it
  • Why can plants, animals and humans conduct electricity?
    Because they contain pure water
    Because they contain water with salts dissolved in it
    Because they are made of metal
  • Which of these materials is safest to touch during an electrical repair?
    Wet cloth
    Rubber gloves
    Copper rod
    Metal fork
  • Why are kitchen appliances designed with insulated handles?
    To improve cooking
    For heating
    For safety during use
    For style
  • Which material should NOT be used in a wire?
    Glass
    Copper
    Aluminum
    Iron
  • Which one is NOT a conductor?
    Coin
    Chopstick
    Copper statue
    Key
  • Which of these materials would you expect to be an insulator?
    Wooden stick
    Metal wire
    Steel rod
    Copper pipe
  • Rubber is used to cover the metal wire because it is...
    An insulator
    Colorful
    A conductor
    Flexible
  • What should you do if your hands are wet?
    Touch only metal parts
    Plug in devices quickly
    Use more water to rinse them
    Avoid touching electrical appliances
  • A material that doesn't allow electricity to pass through is is an electrical ...
    conductor
    insulator
  • Which of these is the safest location to use an electrical device?
    Dry place
    Outside in the rain
    In a bathroom
  • What is pure water
    water that has no impurities or dissolved substances in it
    bottled water
    water that has dissolved salt in it
    boiled water
  • Why is it dangerous to handle plugs with wet hands?
    Water conducts electricity
    Water cools the plug
    Water removes dirt
    Water improves grip
  • Why should children be taught not to insert objects into sockets?
    To avoid making noise
    To avoid electric shock
    To save electricity
    To increase voltage
  • Which part of a wire is the insulator?
    The copper strand
    The metal clip
    The rubber covering
    The wire tip
  • What happens if you touch a live wire with wet hands?
    Nothing happens
    You may get an electric shock
    The wire melts
    You clean the wire
  • Why should we never use electrical devices in the bath?
    Devices won’t work underwater
    Devices get dirty
    Water conducts electricity and can cause shock
    It uses more electricity
  • What is the main risk of using electrical items near water?
    Fire
    Electric shock
    Short circuit
    Noise
  • What happens when pure water is tested with a bulb circuit?
    The bulb explodes
    The bulb lights up brightly
    The bulb doesn’t light up
    The water boils
  • Which part of an electric iron is the conductor?
    The indicator light
    The handle
    The plastic cover
    The heating plate
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