Electricity and Magnetism Unit Test
Directions: Select the BEST response for the following questions.
Wanda's dad wired new lights for her playroom. When he thought everything was connected correctly, he turned on the switch and nothing happened. What could be the problem?
He put too many lights and switches in the circuit.
He needed to connect more batteries to the circuit.
He made a mistake that caused an open circuit.
He should have wired the circuit in parallel.
Marta has a radio in her room. It requires electricity in order to play. Which of the following is necessary in order for electricity to move from the source to the radio?
a light bulb
When electricity moves through a metal wire, the wire is:
Which material conducts electricity?
A piece of glass
To have an electric current when using batteries, there MUST be a:
You should NEVER turn on a radio if you are:
in the dark
in the bathtub
PLASTIC-RUBBER-GLASS-PAPER Which name applies to these materials because of their electrical properties?
Which of these is a conductor?
a short length of string
a plastic drinking straw
a piece of aluminum foil
a piece of chalkboard chalk
Static electricity can be built up by:
clothes spinning around in a dryer
a battery and a light bulb
plugging in an iron
a glass of water
Marie feels a shock from touching the TV screen just after it is turned off. This is due to the build up of:
If you took a woolen cloth and rubbed it briskly over your hair, your hair would stand on ends. What has been created?
Why does plugging in and turning on a hair dryer make it operate?
electrons have a complete circuit to travel
light energy can be converted into heat and wind
heat energy can be transferred from a power station
the flow of electric is now stopped and can be contained
Which components could complete an electric circuit?
a wire, bulb, switch
battery, bulb, switch
battery, wire, switch
battery, wire, bulb
Two students design a circuit that includes a switch, a battery, and light bulb all directly connected by wires. Before flipping the switch, what could the students do to BEST ensure it will work?
clean the wires
check the brightness of the bulb
reverse the direction of the wires
make sure there is a completed path
Gary walks in the house and turns on the light. What could he do that would make this circuit open?
remove the light bulb
leave the light operational
replace the bulb with a dimmer bulb
extend the wire from the switch to the light
A closed circuit is a(n):
free flowing path
Larry connects a wire from a battery to each of the listed items. Which item would allow a current from the battery to pass through if connected to another wire on an opposite end?
brass door knob
Which would be a good conductor of electricity?
piece of paper
What material would be safest to use as an insulator to cover electrical wires?
Objects with like charges repel and unlike charges attract. The girl's hair and the comb have -
Many electrical wires are wrapped in plastic coating because plastic is:
less expensive than steel
more dense than copper
able to keep its shape
a good insulator
Which MUST be included in an electromagnet?
Like or similar poles on two magnets will:
attract each other
have no effect
repel each other
all of these
Carlos makes an electromagnet by coiling a piece of wire around an iron nail and attaching it to a battery. The electromagnet is able to pick up two paper clips. What can Carlos do to make his electromagnet stronger?
Add more coils
Take away coils of wire
Use a shorter nail
Remove the battery
How is a bar magnet different from an electromagnet?
Electromagnets are manmade and can be made stronger using electricity
Bar magnets are manmade and can be made stronger using electricity
Electromagnets are natural and can be made stronger using electricity
Bar magnets are natural and can be made stronger using electricity
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