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Magnetism and Electricity Test

Total questions: 78

Worksheet time: 20hrs 30mins

Name
Class
Date
1.

Match the term

Electromagnetic field

a)

a combination of electric and magnetic fields

b)

a device that uses an electromagnet to convert mechanical energy to electric

c)

a property of some materials to give off an attractive or repulsive force

d)

an external force given off by a magnet that is strongest at the poles

2.

Magnetic materials or elements have electrons that spin and can align to create poles, these areas are referred to as...

a)

domains

b)

polarities

c)

electron potentials

d)

proton potentials

e)

subatomic particles

3.

This is a temporary magnet made by placing a piece of iron inside a current carrying coil of wire?

a)

electromagnet

b)

super magnet

c)

compass

d)

magnetic resonance

4.
Why are magnetic poles called north and south?
a)
because the needle points up and down
b)
because it lines up with Earth's axis
c)
because magnets help with direrctions
d)
because it sounds cool
5.
A device that uses a free-moving magnetic needle to show direction is a:
a)
lodestone
b)
magnet
c)
compass
d)
magnetic field
6.
What causes electricity?
a)
moving neutrons
b)
moving protons
c)
moving atoms
d)
moving electrons
7.
What type of charge do electrons have?
a)
negative
b)
positive 
c)
neutral
d)
nothing
8.
What type of electricity occurs when you rub a balloon on your sweater?
a)
thermal electricity
b)
current electricity
c)
static electricity
d)
work electricity
9.
What happens when you touch a metal doorknob after rubbing your shoes on the carpet?
a)
 The doorknob sends a burst of electric current into your body
b)
 Millions of electrons go from your finger into the doorknob
c)
The doorknob sends millions of electrons into your finger
d)
Your finger becomes negatively charged
10.
Lightning is a form of static electricity. What can you infer about what happens when lightning strikes the ground?
a)
Protons and neutrons are transferred from the clouds to the ground
b)
The ground becomes negatively charged
c)
. Electrons are transferred from the clouds to the ground
d)
An electric current is established between the clouds and the ground
11.
Material that PREVENTS electric current or heat from flowing.
a)
electromagnetic field
b)
electric current
c)
insulator
12.
Material that allows electric current or heat to flow through easily.
a)
electromagnetic field
b)
conductor
c)
open circuit
d)
electric current
13.
A(n)    is a closed loop of conductive material that a current can flow through.
a)
electric current
b)
electric circuit
c)
electric resistance
14.
What do the lines around this magnet represent?
a)
North Pole
b)
South Pole
c)
Magnetic Declination
d)
Magnetic Field
15.
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
16.
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
17.
Magnetism is a type of ____________
a)
force
b)
book
c)
plant
d)
animal
18.

A type of magnet that has temporary magnetic effect when electric current flows through it.


This refer to

a)

Electric

b)

Electronic

c)

Electrostatic

d)

Electromagnet

19.
How can magnets cause objects to have kinetic energy?
a)
A magnetic force can convert kinetic energy stored in a magnetic field to potential energy.
b)
Kinetic energy can convert potential energy stored in a gravitational field.
c)
A magnetic energy can convert potential energy stored in a gravitational field to kinetic energy.
d)
A magnetic force can convert potential energy stored in a magnetic field to kinetic energy.
20.

A group of atoms that has all like poles pointing in the same direction are called

a)

magnetic forces

b)

magnetic fields

c)

magnetic domains

d)

magnetic poles

21.

In the Coulomb's Law Equation F=KqAqBd2F=\frac{Kq_Aq_B}{d^2}  , what does the variable "q" represent? 

a)

Distance between charges

b)

Charge size and sign

c)

Constant 

d)

Mass

22.

Charges are measured in

a)

Coulombs (C)

b)

Jules (J)

c)

Newton/Coulombs (N/C)

d)

meters (m)

23.
The plastic covering is there to:
a)
Provide a conductor for electrical energy to flow.
b)
Provide an insulator so that electrical energy will not pass outside of the wires.
c)
Provide a conductor so that electrical energy can NOT flow.
d)
Provide an insulator so that electrical energy can flow.
24.
What will happen if one light bulb is removed from this circuit?
a)
The other bulbs will go out.
b)
The other bulbs will stay on
c)
The other bulbs will get dimmer.
d)
The battery will become stronger.
25.
When you remove a bulb from a three bulb circuit, and the other two bulbs go off, then the bulbs must have been connected in __________.
a)
parallel
b)
series
c)
open
d)
closed
26.
The picture shows an electrical circuit. This circuit is a series circuit because: 
a)
It has 3 light bulbs.
b)
The same current flows through all three light bulbs.
c)
It uses a single battery.
d)
The electrical current is divided between the three light bulbs.
27.
this circuit is .....?
a)
open
b)
parallel
c)
closed
d)
The cutest little circuit evah!
28.
In a parallel circuit if one of the light bulbs burns out the rest _________.
a)
stop the flow of electricity
b)
 can still light up
c)
 will go out
d)
of the light bulbs burn out also
29.
What is current measured in?
a)
Ω (Ohms)
b)
V (Volts)
c)
A (Amps)
d)
W (Watts)
30.
What is resistance measured in?
a)
Ω (Ohms)
b)
V (Volts)
c)
A (Amps)
d)
W (Watts)
31.
What is Resistance?
a)
The flow of electrons
b)
Electric potential difference
c)
A battery
d)
The ability to reduce the flow of electrons
32.
The mathematical relationship among Voltage, Current, and Resistance
a)
Faraday's Law
b)
Tesla's Law
c)
Edison's Law
d)
Ohm's Law
33.
Current times Resistance equals
 (I X R)
a)
Power
b)
Voltage
c)
Amperage
d)
Ohm
34.
According to this law, the current in a circuit equals the voltage difference divided by the resistance. 
a)
Law of Conservation of Energy 
b)
Ohm's Law 
c)
Law of Conservation of Charges
d)
Newton's First Law 
35.

If q1 was doubled what would be the effect on the Force?

a)

Doubled

b)

Quadrupled

c)

Half

d)

1/4

36.

If r was doubled what would be the effect on the Force?

a)

Doubled

b)

Quadrupled

c)

Half

d)

1/4

37.

Which statement best describes Electrical Energy?

a)

Energy stored in an object due to its height above the earth.

b)

Energy that is possessed by an object due to motion or position. This involves kinetic and potential energy.

c)

Energy that is released during a reaction often in the form of heat.

d)

Energy resulting from a flow of energy charge through a wire or other medium.

38.

What does "r" measure?

a)

the distance between the two charged objects

b)

the amount of charge carried by the objects

c)

the amount of force between two charged objects

d)

the constant value for forces between the objects

39.

The variable "r" in Coulomb's Law would have what units?

a)

Joules

b)

Coulombs

c)

Newtons

d)

Meters

40.

What does Fe stand for?

a)

the electrostatic force

b)

the symbol for iron

c)

the constant for the charges

d)

the charges of the particles

41.

What will be the units of F (or Fe)?

a)

Newtons

b)

Meters

c)

Coulombs

d)

Joules

42.

Why are there two q's in the equation?

a)

because there are two charged objects

b)

because there are protons and electrons

c)

because the particles are moving away from each other

d)

because the particles are moving towards each other

43.

What can you do to increase the value of k?

a)

increase the force

b)

increase the distance

c)

decrease the charge

d)

nothing can be done to change the value of k; it is a constant

44.

Which is the value of the constant in Coulomb's equation?

a)

k = 9·10-9

b)

k = 9.8

c)

k = 6.67·10-11

d)

k = 9 ·109

45.

The law, governing the force between electric charges is known as

a)

Ampere's law

b)

Ohm's law

c)

Coulomb's law

d)

Faraday's law

46.

As electric charges get closer together, the force between them...

a)

becomes weaker

b)

becomes stronger

c)

stays the same

d)

disapears

47.

Which of the following can move from one atom to another?

a)

protons

b)

neutrons

c)

electrons

d)

the nucleus

48.
Two like charges:
a)
 neutralize each other.
b)
repel each other. 
c)
must be neutrons. 
d)
attract each other.
49.

A balloon has a negative charge. A glass rod has a positive charge. What will happen when the rod is brought near the balloon?

a)

the balloon will be attracted to the rod

b)

the balloon will remain in place

c)

the balloon will be repelled by the rod

d)

the balloon will spin in circles

50.

Solve for the total resistance of the circuit shown

a)

50 V

b)

1970 ohms

c)

705 K ohms

d)

20 Amps

51.

Solve for the voltage drop at resistor 1

a)

38 volts

b)

60 Kvolts

c)

50 volts

d)

25 volts

52.

What is the total resistance (RT) across this circuit?

a)

3 kΩ

b)

10 kΩ

c)

13 kΩ

d)

18 kΩ

53.

Resistance?

a)

1/Rp = (1/5) + (1/8) + (1/3)

b)

120 Ω

c)

1.5189873 Ω

d)

1/Rp = (1/5) * (1/8) * (1/3)

54.

solve for the voltage drop across R2 if the total voltage is 50.

a)

15 v

b)

50 v

c)

25 v

d)

33 v

55.

solve for the current across R2 if the total voltage is 50V.

a)

8.33 A

b)

360 A

c)

300 A

d)

1 A

e)

0.12 A

56.

What is the total Resistance?

a)

7 Ω\Omega  

b)

0.6 Ω\Omega

c)

6 Ω\Omega

d)

.7 Ω\Omega

e)

1 Ω\Omega

57.

To find the total resistance in a What is the total current in the circuit?

a)

2.0 A

b)

0.50 A

c)

24 A

d)

8.6 A

58.

What size resistor would produce a 7 Amp current flow with a 12 Volt battery

a)

1.7 Ohm

b)

84 Ohms

c)
4 Ohms
d)

3 Ohms

e)

.58 Ohms

59.

Calculate the VOLTAGE through a load, if a resistance of 300 Ω that has a current of 1.4 A flowing through it.

a)

70 V

b)

420 V

c)

.0046 V

d)

700 V

e)

214 V

60.

The image shows two charged particles with a force of 4.2 N. What would you predict the force of interaction would be when the magnitude of charge on q2 doubles?

a)

4.8 N

b)

8.4 N

c)

1.2 N

d)

2.1 N

e)

16.8 N

61.

What is the Voltage of a circuit that has a resistance of 3 Ω and a current of 5 A?

a)

15 V

b)
10 V
c)

1.6 V

d)

0.6 V

e)

2.1 V

62.

If the battery produced 120 Volts what would be the current flow for a 30 Ohm resistor?

a)

2.1 Amps

b)

4 Amps

c)

1.71 Amps

d)

15 Amps

e)

0.25 Amps

63.

What size resistor would produce a 30 Amp current flow with a 90 Volt battery

a)
1 Ohm
b)
3 Ohms
c)
4 Ohms
d)
12 Ohms
64.

There is a current of 3.0A in a resistor for time t. During time t, a charge of 90C flows through the resistor.

What is time t ?

a)

0.033 s

b)

0.025 s

c)

30 s

d)

270 s

65.

If the current through a circuit is 20 A and the resistance of a light bulb in the circuit is 10 Ohms, what is the voltage difference across the light bulb?

a)

0.5 V

b)

0.2 V

c)

200 V

d)
20 V
66.

A charge of 48 C flows for 12s. What is the current?

a)

8 A

b)

576 A

c)

.25 A

d)

4 A

67.

A charged system is producing 28.4 Volts with a current of 12.4 Amps, what is the circuit's resistance?

a)

352 Amps

b)
0.33 Amps
c)

0.437 Amps

d)

2.29 Amps

68.

A current of 0.8 A flows in a circuit. Calculate the charge flowing through the circuit in two minutes.

a)

0.5 C

b)

30 C

c)

120 C

d)

96 C

e)

1.6 C

69.

How much charge must pass by a point in 30 s for the current to be  0.90 A? 

a)

33.33C

b)
5,0C
c)

27C

d)
2,0C
e)

0.3C

70.

A charge of 48 C flows for 6s. What is the current?

a)

8 A

b)

288 A

c)

8 V

d)

288 V

71.

If the Voltage of the Battery is 12V and the charge is 3C what is the work done (energy)?

a)

135 J

b)

0.25 J

c)

4 J

d)

36 J

e)
72.

An electric motor draws a current of .60A. How long will it take for 9.0 C of charge to pass through it?

a)

20 s

b)

15 s

c)

.067 s

d)
e)

5.4 s

73.

Is a current of 25A passes through the motor of a refrigerator when it is plugged into a 120V wall socket, What is the resistance?

a)

24 Ω\Omega  

b)

3000 Ω\Omega  

c)

0.2 Ω\Omega  

d)
e)

4.8 Ω\Omega  

74.

8000 J of energy produced by a 120V outlet, what is the charge?

a)

.04 C

b)

0.0032 C

c)

316.7 C

d)
e)

66.67 C

75.

1200 J of energy produced as 6 C charge is forced through what Voltage outlet?

a)

200 V

b)

7200 V

c)

.005 V

d)

20 V

e)

720 V

76.

3200 J of energy produced as 32 C charge is forced through what Voltage outlet?

a)

100 V

b)

7200 V

c)

0.01 V

d)

10 V

e)

720 V

77.

32 C charge is forced through a 120 Voltage outlet, what is the energy produced?

a)

3840 J

b)

3.75 J

c)

.267 J

d)

38.4 J

e)

3750 J

78.

5 C charge is forced through a 60 Voltage outlet, what is the energy produced?

a)

300 J

b)

12 J

c)

.267 J

d)

30 J

e)

3.0 J

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