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WorksheetsElectricity and Magnetism Benchmark Review
Total questions: 50
Worksheet time: 2hrs 40mins
Name
Class
Date
1.
An electric generator converts
a)
solar energy to electric energy.
b)
thermal energy to electric energy.
c)
chemical energy to electric energy.
d)
mechanical energy to electric energy.
2.
In which way do permanent magnets and electromagnets differ?
a)
Electromagnets have fixed magnetic strength.
b)
Permanent magnets can only be used in fixed positions.
c)
Electromagnets can attract other substances besides metals.
d)
The largest permanent magnets are weaker than the largest electromagnets.
3.
Which of the following is common to all electric motors?
a)
battery power
b)
magnetic forces
c)
hydroelectric power
d)
internal combustion engines
4.
The figure below shows a neutral glass rod and a positively charged metal sphere. Which of the following best describes the movement of charges as this glass rod touches the sphere?
a)
Negative charges move from the sphere to the glass rod.
b)
Negative charges move from the glass rod to the sphere.
c)
Positive charges move from the sphere to the glass rod.
d)
Positive charges move from the glass rod to the sphere.
5.
Joel inflates a balloon and ties it off. He then rubs the balloon against his hair, which makes his hair stand up. He then places the balloon near the classroom wall and sticks it to the wall. Finally, he pops the balloon with a pin. Which of these is an example of gaining a charge by friction in the example above?
a)
rubbing the balloon against his hair
b)
placing the balloon near the classroom wall
c)
touching the balloon to the classroom wall
d)
popping the balloon with a pin
6.
Joel inflates a balloon and ties it off. He then rubs the balloon against his hair, which makes his hair stand up. He then places the balloon near the classroom wall and sticks it to the wall. Finally, he pops the balloon with a pin. Which of these is an example of gaining a charge by induction in the example above?
a)
rubbing the balloon against his hair
b)
placing the balloon near the classroom wall
c)
touching the balloon to the classroom wall
d)
popping the balloon with a pin
7.
A neutral metal bowl is touched by a negatively charged metal rod. During this process, electrons travel from the __________ to the ____________, and the bowl becomes ______________ charged.
a)
bowl, rod, positively
b)
rod, bowl, positively
c)
bowl, rod, negatively
d)
rod, bowl, negatively
8.
The battery in a cell phone provides a constant flow of electrons through conductors in the same direction to power the phone. A cell phone is powered by ____________ current.
a)
alternating
b)
direct
c)
ampere
d)
distributed
9.
Electrons that flow through your toaster when it is operating
a)
vary back and forth in direction.
b)
become more highly charged.
c)
move in the same direction.
d)
become less highly charged.
10.
As electrons flow through this circuit, the voltage remains constant. If the size of the resistor were to increase,
a)
the electrons would slow down.
b)
the electrons would speed up.
c)
fewer electrons would flow through the circuit.
d)
more electrons would flow through the circuit.
11.
In the image, a battery is used to produce a flow of electrons through this circuit. Which of these would cause more electrons to flow through the circuit?
a)
replacing the resistor with a larger one
b)
replacing the battery with a larger one
c)
replacing the battery with a smaller one
d)
replacing the resistor with two equal resistors in series
12.
A copper wire is wrapped around a solid iron rod many times. In order for this to produce an electromagnet, what must occur?
a)
The iron rod must move back and forth.
b)
The entire system must be spinning.
c)
The end of the copper wires must be in direct contact.
d)
There must be electrons flowing through the copper wire.
13.
An automotive solenoid is an electromagnet that is used to start the car when the key is turned in the ignition. Which of these other parts must be connected to the solenoid in order for it to work properly?
a)
Engine
b)
Battery
c)
Brakes
d)
Heater
14.
Which of these is LEAST likely to include an electric motor?
a)
telephone
b)
blender
c)
washing machine
d)
electric fan
15.
Magnet A is pushed towards magnet B. You observe that the two magnets are attracted to each other and "stick". Which sentence BEST explains this observation?
a)
Both are positively charged.
b)
Both are tightly bonded to each other.
c)
Both are composed of smaller, individual magnets.
d)
Both have all their magnetic domains aligned in the same direction.
16.
In a simple electrical circuit, electrons flow from a battery through a resistor and back to the battery. In a plumbing system, a pump moves water through pipes. If a larger pump were used to move the water through the pipes more quickly, what electrical concept is MOST like the size of the water pump?
a)
resistance
b)
voltage
c)
current
d)
amperage
17.
An ohm is best defined as a unit of measure for
a)
power.
b)
magnetic fields.
c)
electrical resistance.
d)
electrical potential difference.
18.
High powered electromagnets are used in recycling centers to separate iron and steel waste from plastics and paper products. You are an engineer that must increase the power of the magnet without using any additional electrical power. What modification should you make to the electromagnet?
a)
insulate the coils
b)
reduce the number of coils
c)
increase the number of coils
d)
increase the distance between the coils
19.
Which of these would be MOST LIKELY to contain an electric motor?
a)
a blender
b)
a television
c)
a radio
d)
a wristwatch
20.
An electric motor is used in a vacuum cleaner. In order for the motor to rotate, the current through the wires must
a)
be increased.
b)
be decreased.
c)
change direction as it spins.
d)
remain at exactly the same level at all times.
21.
If the resistance of a circuit is tripled, then the current through the circuit would be ____.
a)
one-third as much
b)
three times as much
c)
unchanged
d)
. ... nonsense! There would be no way to make such a prediction.
22.
A dry-cell battery produces ____.
a)
an alternating current
b)
a direct current
c)
the same current that a generator produces
d)
both direct and alternating current
23.
In this example, R1=R2; as electrons flow through the circuit
a)
half of the electrons flow through R1, and half of the electrons flow through R2
b)
more electrons flow through R1, than flow through R2
c)
more electrons flow through R2, than flow through R1
d)
all electrons flow through R1, and R2
24.
In this example, R1=R2=R3; as electrons flow through the circuit
a)
one third of electrons flow through R1, one third flow through R2, and one third flow through R3
b)
more electrons flow through R1, than flow through R2 and R3
c)
most electrons flow through R3
d)
all electrons flow through R1, R2, and R3
25.
As electrons flow through the metal wire in the center of this motor, the metal begins to turn. This is because
a)
a flow of electrons experiences a force in a magnetic field
b)
electric charges act as tiny magnets
c)
positive electric charges are attracted to the south pole of a magnet
d)
positive electric charges are attracted to the north pole of a magnet
26.
The statement that current is equal to the voltage difference divided by the resistance is known as
a)
Einstein's equation
b)
Faraday's equation
c)
Newton's Law
d)
Ohm's Law
27.
A path that allows only one route for an electric current is called a
a)
parallel circuit
b)
parallel current
c)
series circuit
d)
series current
28.
Current that DOES NOT reverse direction is called
a)
alternating current
b)
circuit current
c)
direct current
d)
magnetic current
29.
Electric charge that has accumulated on an object is referred to as
a)
circuit electricity
b)
current circuit
c)
current electricity
d)
static electricity
30.
A circuit that has two or more branches for electrons to follow is a(n)
a)
circuit diagram
b)
electron circuit
c)
parallel circuit
d)
series circuit
31.
A static discharge differs from an electric current in that a static discharge
a)
involves the movement of ions as well as electrons
b)
is a flow of electrons
c)
lasts for only a fraction of a second
d)
results because a force is exerted on the electrons
32.
The location of the strongest magnetic forces is called
a)
electromagnets
b)
magnetic domains
c)
magnetic fields
d)
magnetic poles
33.
Current that reverses direction in a regular pattern is called
a)
alternating current
b)
circuit current
c)
direct current
d)
magnetic current
34.
The region around a magnet where the magnetic forces act is the
a)
electromagnetic pole
b)
magnetic domain
c)
magnetic field
d)
magnetic pole
35.
Resistance is measured in a unit called the
a)
ampere
b)
coulomb
c)
ohm
d)
volt
36.
Objects that keep their magnetic properties for a long time are called
a)
electromagnets
b)
magnetic domains
c)
permanent magnets
d)
temporary magnets
37.
The function of an electric motor is to change
a)
chemical energy to electrical energy
b)
electrical energy to chemical energy
c)
electrical energy into mechanical energy
d)
mechanical energy to electrical energy
38.
The function of an electric generator is to change
a)
chemical energy to electrical energy
b)
electrical energy to chemical energy
c)
electrical energy into mechanical energy
d)
mechanical energy to electrical energy
39.
Electromagnetic induction is the process of producing an electric current by moving a loop of wire
a)
through a magnetic field
b)
through a magnetic domain
c)
around an iron core
d)
around a magnetic pole
40.
The magnetic force of a magnet is
a)
the same at all parts of the magnet
b)
strongest at the center
c)
strongest at the poles
d)
weakest at the poles
41.
A ____ attracts iron objects
a)
magnet
b)
commutator
c)
motor
d)
generator
42.
If a current flowing through a lightbulb is 0.75 amperes and the voltage difference across the lightbulb is 120 volts, how much resistance does the lightbulb have?
a)
120.75 ohms
b)
0.00625 ohms
c)
90 ohms
d)
160 ohms
43.
If the battery is a 9 volt battery and the resistance in the circuit is 18 ohms, how much current is flowing through the circuit?
a)
0.5 amps
b)
72 amps
c)
2 amps
d)
27 amps
44.
Which circuit is wired in series?
a)
A
b)
B
45.
Which circuit is wired in parallel?
a)
A
b)
B
46.
Which circuit represents the ways homes are usually wired?
a)
A
b)
B
47.
Which circuit is the type of circuit that causes an entire string of decorative lights to go out when one of the bulbs burns out
a)
A
b)
B
48.
Which structure in the picture is the permanent magnet?
a)
A
b)
B
c)
C
49.
Which structure in the picture is the power source?
a)
A
b)
B
c)
C
50.
Which structure in the picture will become an electromagnet when current is supplied?
a)
A
b)
B
c)
C
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