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Circuits & Magnetism

Total questions: 33

Worksheet time: 49mins

Name
Class
Date
1.
Electric current is the flow of:
a)
electrons
b)
protons
c)
neutrons
d)
none of these
2.
What is Resistance?
a)
The flow of electrons
b)
Electric potential difference
c)
A battery
d)
The ability to reduce the flow of electrons
3.
What is current measured in?
a)
Ω (Ohms)
b)
V (Volts)
c)
A (Amps)
d)
W (Watts)
4.
If the Voltage is increased and the resistance stays the same, Current will
a)
Increase
b)
Decrease
c)
Stay the same
d)
X
5.
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
6.
Magnetism is generated by moving
a)
protons.
b)
electrons.
c)
neutrons.
d)
elements.
7.
If you place the North pole of a magnet next to the South pole of another magnet, they will:
a)
Attract
b)
Repel
c)
Do nothing
d)
Shatter
8.
If the North Pole of a permanent magnet is placed next to a compass as seen in the picture, which direction will the needle move?
a)
Clockwise
b)
Counter-clockwise
c)
It will not move
d)
Need more information
9.
Which direction is the North Pole of this electromagnet?
a)
Right
b)
Left
c)
Up
d)
Down
10.
In un-magnetized materials the domains are __________ aligned.
a)

super

b)
slightly
c)
randomly
d)
always
11.
The force of magnetism is stronger when magnets are ________________
a)
cold
b)
round
c)
closer together
d)
farther apart
12.
You know this substance is magnetized because
a)
all the domains have right angles
b)
the arrows are drawn in red
c)
the domains are aligned
d)
the domains are random
13.
Voltage can be induced in a wire by
a)
a. moving the wire near a magnet.
b)
b. moving a magnet near the wire.
c)
c. changing the current in a nearby wire.
d)
d. all of these
14.
Electromagnetic induction occurs in a coil when there is a change in
a)
a. electric field intensity in the coil.
b)
b. magnetic field intensity in the coil.
c)
c. voltage in the coil.
d)
d. the coil's polarity.
15.
What is this symbol?
a)
resistor
b)
switch
c)
battery
d)
bulb
16.
what is this symbol for?
a)
light bulb
b)
switch
c)
battery
d)
resistor
17.
The flow of electricity through a conductor is called...
a)
resistance
b)

voltage (potential difference)

c)
current
d)
source of electric current
18.
The force that pushes the electricity through a circuit is called...
a)
resistance
b)

voltage (potential difference)

c)
current
d)
switch
19.

In a closed circuit, how does battery voltage (potential difference) affect current?

a)

As voltage increases, current increases.

b)

As voltage increases, current decreases.

c)

Voltage has no affect on current.

d)

If voltage exceeds current, a short circuit circuit will develop.

20.

If an electrical circuit were analogous to a water circuit at a water park, then the battery voltage would be comparable to ___________________.

a)

the rate at which water flows through the circuit

b)

the speed at which water flows through the circuit

c)

the distance that water flows through the circuit

d)

the water pressure between the top and bottom of the circuit

e)

the hindrance caused by obstacles in the path of the moving water

21.
a)
Battery
b)
Fuse
c)
Diode
d)
Switch (open)
22.
What is the energy source for a circuit?
a)
Light bulb
b)
Battery
c)
Wire
d)
Switch
23.

What quantity describes the rate of flow of charges or the total amount of charges moving past a point in a conductor?

a)

Voltage

b)

Electric Current

c)

Electric Resistance

d)

Electrical Power

24.

What quantity describes the opposition to the flow of electrons in an electrical circuit?

a)

Voltage

b)

Electric Current

c)

Electric Resistance

d)

Electrical Power

25.
What do the lines around this magnet represent?
a)
North Pole
b)
South Pole
c)
Magnetic Declination
d)
Magnetic Field
26.
If you cut a magnet in half, what happens to the poles?
a)
One half gets the North Pole, the other half gets the South Pole
b)
Both halves get only a North Pole
c)
Both halves get only a South Pole
d)
Both halves get a North pole and a South Pole
27.
What is responsible for the Magnetic Field around Earth?
a)
The Earth's crust
b)
The Earth's molton iron core
c)
The Earth's mantel
d)
The Sun
28.
What kind of magnet can be turned on and off?
a)
refridgerator magnet
b)
electromagnet
c)
magnetite
d)
iron
29.
The strongest part of a magnet is...
a)
the bars.
b)
the force field.
c)
the poles. 
d)
the middle.
30.

____________ __________ assumes that current flows out of the positive side of the battery, through the circuit, and back to the negative side of the battery.

a)

Conventional Current

b)

Ohms Law

c)

Electron Flow

d)

Kirchoff's Current Law

31.

____________ __________ is what actually happens. The electrons flow out of the negative side of the battery, through the circuit, and back to the positive side of the battery.

a)

Conventional Current

b)

Ohm's Law

c)

Electron Flow

d)

Kirchhoff's Current Law

32.

Takes place when Earth's magnetic field changes

a)

magnetic reversal

b)

mid-ocean ridge

c)

normal polarity

d)

reversed polarity

e)

seafloor spreading

33.

What’s the most important function of Earth’s magnetic field?

a)

Earth's magnetic shield deflects asteroids and meteors

b)

Earth's magnetic shield keeps energy from escaping into space

c)

Earth's magnetic shield deflects most of the solar wind

d)

Earth's magnetic shield helps birds and other animals navigate

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