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WorksheetsElectricity and Magnets
Total questions: 39
Worksheet time: 24mins
Name
Class
Date
1.
A student removed a wool hat from her head. Her hair stood up from static electricity. What did her hat do to cause this?
a)
gave her hair a neutral charge
b)
removed protons from her hair
c)
gave her hair a negative charge
d)
removed electrons from her hair
2.
If Bulb 1 burns out, which other bulb(s) will also stop emitting light?
a)
2
b)
3
c)
3 and 4
d)
2, 3 and 4
3.
Four significantly different household appliances (blender, mixer, toaster, and food processor) are plugged into four outlets along a counter. Turning on or off one or more of the appliances does not affect the performance of the other appliances because the four appliances
a)
run on a direct current.
b)
are connected in series.
c)
are connected in parallel.
d)
run on an alternating current.
4.
Which change to a wire would cause its resistance to decrease?
a)
increase its length
b)
increase its temperature
c)
increase its diameter
d)
increase its resistivity
5.
A compass is wrapped within a coil of copper wire that is connected to a switch and battery. The drawing shows the switch before and after it is closed. Which statement best explains why the compass needle turns 90° when the switch is closed?
a)
The current from the battery is conducted by the needle.
b)
The current from the battery demagnetizes the needle.
c)
The current through the coil produces an electric field.
d)
The current through the coil produces a magnetic field.
6.
In the diagram, the nail behaves just like a bar magnet when current runs through the circuit. What will most likely happen when the switch is closed?
a)
A magnetic field should be produced.
b)
The iron in the nail should break down.
c)
The battery will be recharged.
d)
Rusting should be immediately observed.
7.
A generator converts mechanical energy to electrical energy by using a conducting metal loop turning in a
a)
magnetic field.
b)
gravitational field.
c)
steel sphere.
d)
copper sphere.
8.
A magnet can generate an electric current in a wire if the magnet is close enough to the wire and if the magnet is also
a)
strong.
b)
weak.
c)
at rest.
d)
in motion.
9.
A positively charged ball is placed an equal distance between two charged objects (1 and 2). In which case will the positively charged ball move toward Object 2?
a)
A
b)
B
c)
C
d)
D
10.
Which is a true statement about a series circuit?
a)
All the current flows through every part of the circuit.
b)
Every part of the circuit is positively charged.
c)
The current through the circuit can take several paths.
d)
Every part of the circuit is negatively charged.
11.
a)
Light bulb 1 and light bulb 2 will work.
b)
Light bulb 1 and light bulb 2 will not work.
c)
Light bulb 1 will work, but light bulb 2 will not work.
d)
Light bulb 1 will not work, but light bulb 2 will work.
12.
A student wants to build a simple circuit. Which material would be used to design a circuit with the least amount of resistance?
a)
long wires with a thin diameter
b)
long wires with a large diameter
c)
short wires with a thin diameter
d)
short wires with a large diameter
13.
Two magnets are stuck end to end by a magnetic force. Which statement best describes these magnets?
a)
The north poles of the magnets are attracted to each other.
b)
The south poles of the magnets are attracted to each other.
c)
The south pole of one magnet is repelled be the north pole of the other magnet.
d)
The north pole of one magnet is attracted to the south pole of the other magnet.
14.
In cars with electric door locks, electromagnets allow the doors to be locked and unlocked at the push of a button. Why is an electromagnet used for this kind of door lock?
a)
Using electromagnets conserves electricity.
b)
Using electromagnets prevents static electric shock.
c)
Electromagnets can easily be turned off.
d)
Electromagnets can attract metals or nonmetals.
15.
A series circuit has a current of 3 A. The circuit contains a 12-Ω resistor. What is the voltage of the circuit?
a)
0.25 V
b)
4V
c)
15V
d)
36V
16.
A flashlight bulb connected to a 6 V battery draws a 0.5 A current. What is the power used by the flashlight bulb?
a)
1.25 W
b)
3 W
c)
6.5 W
d)
12 W
17.
Which of the above pictures shows a magnetized object?
a)
A
b)
B
c)
Both A and B are magnetized.
d)
Neither A nor B are magnetized.
18.
A pathway for electricity to travel is called___________
a)
current
b)
static electrcity
c)
circuit
d)
circle
19.
Which best describes a simple series circuit?
a)
Electricity flows along one pathway.
b)
The flow of electricity comes from the switch.
c)
Electricity flows along many pathways.
d)
The flow of electricity comes from the light bulb.
20.
What is the power source in this circuit?
a)
Bulb
b)
Switch
c)
Wire
d)
Battery
21.
How could you make this circuit work?
a)
Close the switch
b)
Take out the bulbs
c)
Add another battery
d)
Add another bulb
22.
Which of these objects is an insulator?
a)
Copper Wire
b)
Paper Clip
c)
Steel Pole
d)
Rubber Gloves
23.
An object through which electrons can easily flow is called a(n) ___________.
a)
Conductor
b)
Insulator
24.
Electricity is the flow of _________.
a)
Protons
b)
Neutrons
c)
Electrons
25.
A open circuit allows charges to flow.
a)
True
b)
False
26.
Which one is a conductor?
a)
wood
b)
iron
c)
plastic spoon
d)
paper
27.
A circuit in which energy can freely flow.
a)
Closed Circuit
b)
Free Circuit
c)
Open Circuit
d)
Energy Circuit
28.
Choose the correct sentence.
a)
This circuit will work because it is an open circuit.
b)
This circuit will work because it is a closed circuit.
c)
This circuit will NOT work because it is an open circuit.
d)
This circuit will NOT work because it is a closed circuit.
29.
Choose the corrrect sentence.
a)
This circuit will work because it is an open circuit
b)
This circuit will work because it is a closed circuit.
c)
This circuit will NOT work because it is an open circuit.
d)
This circuit will NOT work because it is a closed circuit.
30.
Which statement is true?
a)
Magnetic field lines run from a south pole to a north pole.
b)
Magnetic field lines run from a north pole to a south pole.
c)
There are no magnetic field lines inside a magnet.
d)
Iron is attracted to north pole but repelled from south pole
31.
What does the first Right Hand Rule tell you?
a)
Fingers point to current and the thumb points toward thumb
b)
Fingers are the magnetic field & thumb direction of current
c)
Fingers are current and thumb is direction of magnetic field
d)
Thumbs up is the OK sign for magnetic field to work
32.
How does an electromagnet work?
a)
You push a magnet into an electrical socket
b)
Wrap wire around a nail and touch it to a magnet
c)
Run electrical current through a coil of wire
d)
push an iron nail into an electrical socket
33.
What will happen when these magnets are brought close together?
a)
They will attract each other.
b)
They will repel each other.
c)
Both magnets will turn to the left
d)
Both magnets will turn to the right
34.
The space around a magnet where the force of a magnet can attract best is called__________
a)
magnetism
b)
bar magnet
c)
horseshoe magnet
d)
magnetic field
35.
What do the lines around this magnet represent?
a)
North Pole
b)
South Pole
c)
Magnetic Declination
d)
Magnetic Field
36.
Electric motors are devices that convert _____ energy into _____ energy.
a)
electrical; mechanical
b)
mechanical; electrical
c)
chemical; potential
d)
mechanical; kinetic
37.
Generators are devices that convert _____ energy into _____ energy.
a)
chemical; mechanical
b)
mechanical; electrical
c)
electrical; mechanical
d)
potential; kinetic
38.
You can make an electromagnet stronger by: using __________________ coils of wire
a)
bigger
b)
smaller
c)
more
d)
less
39.
What happens if you break a magnet in two?
a)
You get two magnets that each have a south pole.
b)
You will get two magnets that each have a north and south pole
c)
You will have two magnets that don't have poles.
d)
You will still have one magnet.
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