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electrical installation and maintenance exam unit test

Total questions: 81

Worksheet time: 56mins

Name
Class
Date
1.
What is a closed path for electrons to flow through?
a)
static electricity
b)
circuit
c)
amperes
2.
Lightning is an example of _________.
a)
static electricity
b)
current electricity
c)
watts
d)
voltage
3.
What is a closed path for electrons to flow through?
a)
static electricity
b)
circuit
c)
amperes
4.
Lightning is an example of _________.
a)
static electricity
b)
current electricity
c)
watts
d)
voltage
5.
Identify the conductor below.
a)
cloth rag
b)
plastic bottle
c)
gold ring
6.
Identify the insulator below.
a)
aluminum foil
b)
paperclip
c)
rubber eraser
7.
Thicker wires have _______ resistance than thinner wires.
a)
more
b)
less
c)
the same
8.
Electric current is measured in ______.
a)
Watts
b)
Volts
c)
Amperes
9.
As the resistance in a circuit increases, the electric current __________.
a)
increases
b)
decreases
c)
stays the same
10.
Which formulas represents Ohm's law?
a)
V=IR
b)
R=IV
c)
I=RV
11.
Which subatomic particles have a positive charge?
a)
neutrons
b)
electrons
c)
protons
12.
An accumulation of electrons on an object is known as ___________.
a)
current
b)
AC
c)
static electricity
13.
What is the unit for resistance?
a)
Volts
b)
Amperes
c)
Ohms
14.
How many volts are in a circuit with a battery that has a resistance of 10 Ohms and a current of 2 Amps? 
a)
.5 Volts
b)
5 Volts
c)
20 Volts
15.
Electricity is the flow of _________.
a)
protons
b)
neutrons
c)
electrons
16.
What type of circuit is pictured?
a)
series
b)
Parallel
17.
What type of circuit is pictured?
a)
series
b)
parallel
18.
Which type of current comes from a battery?
a)
alternating current (AC)
b)
direct current (DC)
19.

What is the commercial unit of electrical energy?

a)

Joules

b)

Kilojoules

c)

Kilowatt-hour

d)

Watt-hour

20.
Which of the following is true about a parallel circuit? 
a)
Current is the same through all resistors in parallel.
b)
Voltage used by each resistor is the same.
c)
Power dissipated by each resistor is the same.
d)
Voltage used by each resistor is dependent on the resistance of each.
21.
Three resistors, R1=3.0 ohm, R2=6.0 ohm, R3=9.0 ohm, are connected in parallel in a circuit with an 18 V battery. What is the current passing through each resistor? 
a)
11 A
b)
6A through R1 and R2, and 2 A through R3.
c)
6 A through R1, 3 A through R2, and 2 A through R3.
d)
1.6 A
22.

If the current in a specific copper wire increases this can be due to _____________________.

a)

An increase in the charge carrier density

b)

An increase in the electron drift speed

c)

An increase in its cross sectional area

d)

An increase in the charge of electrons

23.

If the current at a given point in a circuit is 2.5 Amp, then how many electrons pass that point on the circuit in a time period of 1 minute.

Answer:

a)

9.375 x 1020 electrons

b)

9.375 x 1021 electrons

c)

9.375 x 1019 electrons

d)

9.375 x 1018 electrons

24.

Drift velocity is

a)

The average velocity with which the electrons are drifted towards the positive terminal of the battery.

b)

Velocity of an electron in a conductor

c)

Average thermal velocity

d)

None of these

25.
Electric current that flows in only one direction. 
a)
Voltage 
b)
Direct Current 
c)
Alternating Current
d)
Series Circuit 
26.
current that flows through a circuit from the positive terminal of a battery through the circuit to the negative terminal of the battery
a)
drift acceleration
b)
drift velocity
c)
conventional current
d)
current density
27.
What size resistor would produce a 3 Amp current flow with a 12 Volt battery
a)
1 Ohm
b)
3 Ohms
c)
4 Ohms
d)
12 Ohms
28.
The conductor with higher temperature 
a)
high resistance 
b)
low resistance 
c)
same resistance 
d)
it does not affect the resistance 
29.

A wire has a resistance R.

What is the resistance when both the length and radius of the wire are doubled?

a)

R/2

b)

2R

c)

R/4

d)

4R

30.

Silicon

a)

Conductor

b)

Insulator

c)

Semi-Conductor

31.

Which bulb will be the brightest?

a)

Bulb A

b)

Bulb B

c)

Bulb C

d)

They will all be the same

32.

In a parallel circuit, if one connection is broken, all of the connections stop working.

a)

True.

b)

False.

33.
What kind of circuit is this?
a)
series
b)
parallel
34.

Which of the following is an ohmic conductor?

a)

transistor

b)

vacuum tube

c)

nichrome wire

d)

electrolyte

35.
To complete a circuit the switch must be
a)
unattached
b)
open
c)
closed
36.
Two types of circuits are
a)
parallel and magnetic
b)
electromagnetic and series
c)
series and parallel
37.
The flow of electricity requires a
a)
complete path
b)
incomplete path
c)
insulated current
38.

What instrument is used to measure the electric current that flows through a wire?

a)

voltmeter

b)

galvanometer

c)

ammeter

d)

electric meter

39.

What happens when there is no voltage in a circuit?

a)

The circuit becomes superconductive

b)


The circuit will work just perfectly fine

c)


The free electrons move randomly between atoms

d)

The resistance of the circuit increases

40.

How is voltage represented in a voltmeter when measuring electrical circuits?

a)


With the symbol W and a horizontal line above it

b)


With the symbol R and a vertical line above it

c)

With the symbol V and dashes above it

d)

With the symbol A and a wave line above it

41.

What happens if a 110-volt device is plugged into a 220-volt socket?

a)

The device will work normally

b)

The device will burn out

c)

The device will be dimmer

d)

The device will flicker but works perfectly fine

42.

Which of these schematic symbols best represent an AC voltage source?

a)

b)

c)

d)

43.

Which of these schematic symbols best represent an DC voltage source?

a)

b)

c)

d)

44.

In the circuit diagram above, Rx and Ry are identical ohmic resistors connected in parallel. When the switch is open, the ammeter reading is 0,1 A and the voltmeter reading is 3 V. Ignore the internal resistance of the battery.

What will be the reading on the AMMETER and VOLTMETER when the switch is closed?

a)

READING ON AMMETER: Equal to 0,1

READING ON VOLTMETER: Equal to 3 V

b)

READING ON AMMETER: Greater than 0,1

READING ON VOLTMETER: Equal to 3 V

c)

READING ON AMMETER: Less than 0,1

READING ON VOLTMETER: Less than 3 V

d)

READING ON AMMETER: Greater than 0,1

READING ON VOLTMETER: Greater than 3 V

45.

Consider the three circuit components represented above. Which ONE of the options below best represents the names of the components in the correct sequence, from left to right?

a)

Light bulb, resistor, cell

b)

Resistor, light bulb, cell

c)

Cell, light bulb, variable resistor

d)

Cell, variable resistor, light bulb

46.
Two electrically neutral metal spheres, A and B, on insulating stands are placed in contact with each other. A negatively charged rod is brought near, but does not touch the spheres, as shown in the diagram below. How are the spheres now charged?
a)
A is positive and B is positive.
b)
A is negative and B is positive.
c)
A is positive and B is negative.
d)
A is negative and B is negative.
47.

Two like charges

a)

attract each other.

b)

repel each other.

c)

neutralize each other.

d)

have no effect on each other.

e)

must be neutrons.

48.
When a glass rod is rubbed with silk and the glass rod becomes positively charged, what happens to the electrons?
a)
they are removed from the rod
b)
they are added to the rod
49.

A charged comb will attract a neutral piece of paper.

a)

True

b)

False

50.

Metal sphere A is neutral. Metal sphere B is negatively charged. The two spheres come into contact briefly. What type of charge does sphere A have after contact?

a)

neutral

b)

positive

c)

negative

51.

A positive charge and a negative charge held near each other are released. As they move, the force on each particle

a)

increases.

b)

decreases.

c)

stays the same.

52.

Objects can be charged by

a)

friction

b)

contact

c)

induction

d)

all of the above

53.

Electrical forces between charges are strongest when charges are

a)

close together.

b)

far apart.

c)

the electrical force is constant everywhere.

54.

After a balloon is rubbed against wool, the two objects will ________ each other because they have ___________ charges.

a)

attract; like

b)

attract, opposite

c)

repel; like

d)

repel; opposite

55.

What is the end result of charging by contact?

a)

Objects have the same charge, so they will attract one another.

b)

Objects have the same charge, so they will repel one another.

c)

Objects have opposite charges, so they will attract one another.

d)

Object have opposite charges, so they will repel one another.

56.

What method of charging is shown in this picture?

a)

Contact

b)

Friction

c)

Grounding

d)

Electron Shifting

57.

What is the end result of charging two objects by friction?

a)

Object have the same charge, so they will attract one another.

b)

Object have the same charge, so they will repel one another.

c)

Object have opposite charges, so they will attract one another.

d)

Object have opposite charges, so they will repel one another.

58.

You charge a balloon by rubbing it on your hair. This is an example of what method of charging?

a)

Friction

b)

Conduction

c)

Grounding

d)

Induction

59.

What are the charges of a proton, neutron, and electron (in order)

a)

positive, negative, neutral

b)

negative, neutral, positive

c)

neutral, positive, negative

d)

positive, neutral, negative

60.
According to Coulomb's law, you can do all of the following to increase the electric force of repulsion EXCEPT
a)
Increase charge 1
b)
Increase charge 2
c)
Decrease the distance
d)
Increase the distance
61.

Electric charge is _____________.

a)

found only in a conductor

b)

conserved

c)

found only in insulators

d)

not conserved

62.

It is the complete loop through which an electrical current flows.

a)

electrical current

b)

electrical charge

c)

electrical circuit

63.

It is the unit used to measure electrical tension

a)

V

b)

A

c)

Ω

64.

A situation in which a faulty connection or damaged wire causes electricity to travel along the wrong route and damage an electrical device

a)

resistance

b)

short circuit

c)

voltage

65.

Materials that allow the electrical current to flow

(a)  

66.

Italian physicist who invented the first electric battery

(a)  

67.

Why doesn't the light bulb work?

a)

Because the batteries are flat

b)

Because the switch is closed

c)

Because the switch is open

d)

Because the wires are too long

68.

What happens to a series circuit if a lamp is broken?

a)

The other bulb will be brigther

b)

The other bulb will stop working

c)

Both bulbs will be dimmer

d)

Both bulbs will be bright

69.

What type of circuits do we have in our houses?

a)

parallel

b)

series

c)

both

70.

What are solar cells?

a)

They convert light energy into electrical energy

b)

They generate electricity

c)

They do not generate electricity

d)

They heat up water

71.

A ____________________________ circuit is a circuit in which electrical current has more than one path to follow.

a)

simple

b)

open

c)

closed

d)

parallel

72.
The image on the left is a 
a)
series circuit
b)
parallel circuit
c)
a weird circuit
73.
What supplies the energy in an electric circuit?
a)
light bulb
b)
conductor
c)
wire
d)
battery
74.
Which of these could be used as a resistor in a circuit?
a)
pencil
b)
gas engine
c)
rubber eraser
d)
electric motor
75.
The circuit on the left is
a)
open
b)
closed
76.
Electricity flows from which side of the battery?
a)
negative
b)
positive
c)
I have no idea
77.
The potential difference that causes charges to move in a circuit is ___.
a)
voltage
b)
resistance
c)
current
d)
electric discharge
78.
A particle that carries a negative electric charge is called a(n) ______.
a)
neutron
b)
atom
c)
proton
d)
electron
79.
What types of charges attract?
a)
Positive and Positive
b)
Positive and Neutral
c)
Negative and Neutral
d)
Positive and Negative
80.
A plastic rod is rubbed with a dry piece of cloth and the rod becomes positively charged.  The rod has …  
a)
gained electrons
b)
lost electrons
c)
gained protons
d)
lost protons
81.
If you rub a glass rod with a piece of silk, the rod becomes positively charged. This means that
a)
friction destroyed electrons in the rod.
b)
the silk has become negatively charged.
c)
protons have moved to the rod.
d)
glass attracts more protons.

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