WorksheetsUnit 8 Electricity and Magnetism Test Review
Total questions: 30
Worksheet time: 17mins
Static electricity builds up in the dryer as clothes rub together. When clothes are pulled out of the dryer a spark can be produced. What could be put in the dryer that would attract the extra electrons and reduce the static electricity?
Balls of aluminum foil
Balls of plastic
Balls of pieces of paper
Balls of wood
The atmosphere removes the build-up of static electricity through —
clouds
thunder
lightning
rain
clouds
thunder
lightning
rain
The shown experiment is conducting static electricity through —
an insulator
a transmitter
a conductor
a transistor
Which two examples will most likely create static electricity when rubbed together?
Balloon and hair
Hands and fingers
Feet and carpet
Branches and twigs
The build up of electric charges on an object is called —
electric field
alternating current
static electricity
closed circuit
What device converts mechanical energy into electrical energy?
electric motor
electric generator
electric current
electromagnet
What is a device that converts electrical energy into mechanical energy called ?
electric current
electric motor
electric generator
electromagnet
A student performed an experiment to check whether objects are good or bad conductors of electricity. The student makes a circuit using different objects, as shown, and checks if the light bulb is lit or not. He then makes a table listing his observations.
What (two) statements can be concluded from the experiment?
Clay is a good conductor of electricity.
A popsicle stick is a good conductor of electricity.
A coin is a bad conductor of electricity.
An iron nail is a good conductor of electricity
An eraser is a bad conductor
Which of the following are NOT good conductors of electricity?
copper wire
aluminum can
winter glove
iron nail
wooden spoon
Why is a bulb brighter when it is powered by two batteries rather than one?
The flow of electricity in the circuit is greater.
The flow of electricity in the circuit is the same.
The flow of electricity in the circuit is less.
The bulb will not glow brighter with two batteries.
One way to generate electricity is by moving a wire through —
a magnetic field
a steamy environment
running water
a spinning wheel
Three students begin planning an investigation related to electricity. They decide it must include a way to measure the presence of electrical charge, as well as clearly recording how they change the distances between objects. What is most likely the purpose of their investigation?
To prove that electrical fields can only exist between objects on this planet
To show the relationship of electricity and magnetism
To prove the existence of electricity in the natural world
To show that electrical forces can exist between objects which are not touching
The path that is made for electric current is called a —
circuit
amps
voltage
insulator
What type of current only flows in one direction through a wire?
Alternating
Direct
Voltage
Electric
A student is conducting an experiment on water electrolysis. What is the student's independent variable?
Battery voltage
Glass composition
Amount of water
Types of pencils
If a step-up transformer has more turns on the output side than the input side, what is the resulting voltage coming out?
less voltage
greater voltage
equal voltage
no voltage
Which variable is being changed in the given models?
Voltage of the battery
Number of coils of wire on the nail
Length of the connecting wire
Thickness of the iron nail
She wants to increase its magnetic strength. What two modifications would help increase the magnetic strength of the electromagnet?
Connecting the ends of the wire to one terminal of the battery
Using a thinner nail
Increasing the number of turns of wire on the nail
Increasing the voltage of the battery
Which circuits are parallel?
What type of circuit is illustrated in the example?
Series circuit
In-line circuit
Parallel circuit
Static circuit
What is shown in the picture?
Open series circuit
Open parallel circuit
Closed parallel circuit
Closed series circuit
When an electric current can travel along more than one path, it is traveling in a—
open circuit
parallel circuit
perpendicular circuit
series circuit
What type of material will NOT allow an electric current to pass through it?
Closed
Open
Insulator
Conductor
A lifting electromagnet is able to pick up a large, very heavy sheet of metal and move it to an area to be shaped or cut as needed. This magnet is on when electricity flows through the coiled wire and is off when the electricity is not flowing. What make an electromagnet a good choice in this application?
Its magnetic field is only on when current flows allowing metal to be picked up or dropped when needed
Its current field is off when the magnetic field is on allowing metal to be picked up or dropped when needed
The magnetic field disappears when the current is on allowing metal to be picked up or dropped when needed.
The electric field cancels out allowing metal to be picked up or dropped when needed.
What do the blue arrows represent around the wire?
the magnetic field
the electric field
the static field
the electromagnetism field
Transistors are semiconductors used to —
lower the resistance of a magnetic signal
to create a magnetic signal
amplify electrical signals
insulate an electrical signal
A student has two bar magnets. He places the unlike poles of the two magnets close to each other. Which diagram shows the magnetic field between them?
Identify the (2) data or observations that will most likely be collected when the magnets are pushed near one another.
The magnets attract or repel one another
The magnets are attracted to the table
The magnets do or do not touch
The magnets float above the table
Which of the following is NOT true about magnets?
Magnets occur in nature.
Metal will attract anywhere on a magnet.
Magnets have two north poles.
Magnets can be made with electricity and some metals.
What can the student understand from the activity?
Magnets can attract objects made of plastic.
Magnets attract objects made of iron.
Magnets can attract iron objects through plastic.
Magnets can attract iron objects through liquids.
