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Worksheets

Electronics

Total questions: 75

Worksheet time: 55mins

Name
Class
Date
1.

Resistance in an electrical circuit is measured in:

a)

Volts (V)

b)

Amps (A)

c)

Farads (F)

d)

Ohms (Ω)

2.

Which of the following electronic components used in class functions as a switch?

a)

Resistor

b)

Diode

c)

Transistor

d)

Capacitor

3.

If electricity in a circuit is compared to water flowing in a river. The slope of the river could be compared to the:

a)

Voltage

b)

Current

c)

Resistance

d)

Capacitance

4.

For an electrical circuit where the resistance is kept constant and the voltage is increased, what will happen to the current?

a)

Current increases

b)

Current decreases

c)

No change in current

d)

You can't tell from the information given

5.

A circuit fault where too much current flows due to low resistance, possibly creating an unsafe situation, is called:

a)

An open circuit

b)

A hazardous loop

c)

A short circuit

d)

A closed loop

7.

In the image of a DC Motor shown. A is the:

a)

Armature

b)

Stator

c)

Commutator

d)

Brush

e)

Field Winding

7.

In the image of a DC Motor shown. A is the:

a)

Armature

b)

Stator

c)

Commutator

d)

Brush

e)

Field Winding

8.
Ultrasonic Sensor
a)
Distinguishes high and low sounds
b)
Detects light and dark colors, uses reflected or absorbed light
c)
Detects distance by emitting ultrasound waves and measuring how long they take to return to sensor
d)
Detects pressure
9.
Touch Sensor
a)
Detects pressure
b)
Detects distance by emitting ultrasound waves and measuring how long they take to return to sensor
c)
Detects light and dark colors, uses reflected or absorbed light
d)
Distinguishes high and low sounds
10.

Which one of these is a use of LDR

a)

Tubelight

b)

Street lights

c)

Fan

d)

Sun

11.

Digital sensors help to __________

a)

Store charge and release it when required

b)

Observe things clearer

c)

Produce charge

12.

Which sensor is used when parking cars to judge distance?

a)

Distance

b)

Proximity

c)

Pressure

d)

Movement

13.

This sensor is used for burglar alarms

a)

Temperature

b)

Humidity

c)

Movement/Motion

d)

PH

14.

Type of sensor used to detect both metallic and non-metallic objects

a)

Capacitive sensors

b)

Inductive sensors

c)

Thermocouple sensors

d)

None of the above

15.
Two like charges
a)
 neutralize each other.
b)
repel each other. 
c)
must be neutrons. 
d)
attract each other.
16.

What kind of charge does static electricity produce

a)

Positive

b)

Permanent charge

c)

Negative

d)

Temporary charge

17.

Transistors act like tiny "____________."

a)

Electron sources

b)

Switches

c)

Batteries

d)

Bees?

18.

What are the names of the terminals X, Y and Z?

a)

X = Base, Y = Collector, Z = Emitter

b)

X = Emitter, Y = Base, Z = Collector

c)

X = Collector, Y = Base, Z = Emitter

d)

X = Collector, Y = Emitter, Z = Base

19.

Diagram shows a light controlled switch. The alarm will be activated when

a)

the surrounding is dark

b)

the surrounding is bright

c)

the temperature of the surrounding is high

d)

the temperature of the surrounding is low

20.

The street lights use electronic control system that switches the lights on when the surrounding is dark. What is the input sensor of the control system?

a)

A thermistor

b)

A light emitting diode

c)

A microphone

d)

A light dependent resistor

21.

One function of the transistor is to_____________?

a)

rectify

b)

amplify

c)

limit

d)

control

22.

transistor has 3 electrodes namely

a)

PNP

b)

NPN

c)

Base/ Collector/ Emitter

d)

Drain/ Gate/ Source

23.
Emits light when a current passes through it
a)
fuse
b)
diode
c)
LED
d)
resistor
24.

A parallel circuit is brighter because...

a)

All the lamps share the current from the battery

b)

Each lamp has its own pathway to the battery

c)

The lamps have larger filaments, so they are brighter

d)

There is only one pathway

25.

The pathway through which electricity flows

a)

Circuit

b)

Red or black wires

c)

Current

d)

battery terminals

26.

Our 9 volt batteries have this type of current

a)

variable

b)

indirect

c)

alternating

d)

direct

27.

The red wire coming from the battery is the

a)

neutral wire

b)

positive wire

c)

negative wire

28.

When a switch is open the lamp...

a)

Will be on

b)

Will be off

c)

Will be making a short circuit

29.

An example of a good insulator is

a)

Copper

b)

Plastic

c)

Water

d)

aluminum

30.

The filament in an incandescent light glows because....

a)

The electrons are crowded and the filament heats up

b)

The electrons flow faster and the filament heats up

c)

The electrons stop flowing when the reach the filament

31.

Which is the most efficient type of light bulb?

a)

Incandescent

b)

Fluorescent

c)

CFL

d)

LED

32.

What does this schematic symbol represent?

a)

Capacitor

b)

Lamp

c)

Resistor

d)

Battery

33.

What does this schematic symbol represent?

a)

Wire

b)

Resistor

c)

Lamp

d)

Switch

34.

What does this schematic symbol represent?

a)

Lamp

b)

Wire

c)

Switch

d)

Resistor

35.

What does this schematic symbol represent?

a)

Switch

b)

Lamp

c)

Wire

d)

Resistor

36.

The two connectors on the battery are called...

a)

Resistors

b)

Terminals

c)

Switches

d)

Snaps

37.

A series circuit has dim lamps because...

a)

Each lamp has it's own pathway to the battery

b)

Each lamp is side by side

c)

The lamps have to share the current

d)

The lamps amplify the current

38.

Touching the red and black wires from the battery together..

a)

Makes the battery work better

b)

Creates a series and parallel circuit

c)

Creates a short circuit

39.
Current is measured in:
a)
volts
b)
amperes
c)
ohms
d)
watts
40.
Resistance is measured in:
a)
volts
b)
amps
c)
ohms
d)
watts
41.
A thermistor is used in a circuit to control a piece of equipment automatically. What might this circuit be used for?
a)
lighting an electric lamp as it becomes darker
b)
ringing an alarm bell if a locked door is opened
c)
switching on a water heater at a pre-determined time
d)
 turning on an air conditioner when the temperature rises 
42.
A 3.0 Ω lamp and a 6.0 Ω lamp are connected in parallel. What is the total resistance of the combination?
a)
0.5 Ω
b)
2.0 Ω
c)
9.0 Ω
d)
18.0 Ω
43.
Which graph shows the output of a simple a.c. generator? 
a)
A
b)
B
c)
C
d)
D
44.
Four lamps are labelled ‘60 W 240 V’.
In which circuit are the lamps connected so that they all work at normal brightness? 
a)
A
b)
B
c)
C
d)
D
45.
Which electrical component would not normally be found in a battery-operated torch (flashlight)? 
a)
A
b)
B
c)
C
d)
D
46.
Which electrical component would not normally be found in a battery-operated torch (flashlight)? 
a)
A
b)
B
c)
C
d)
D
47.

What is the name of an object that opposes to electrity?

a)

Circuit

b)

Resistance

c)

Electron

d)

Current

48.

What is the act of electricity passing throught an object

a)

Charge

b)

Resistance

c)

Ampere

d)

Conduct

49.

Charge is?

a)

electricity

b)

Rauw alejandro

c)

the electric property of an object that makes it have a negative or positive force

d)

electric current

50.
What 'flows' in a wire?
a)
Protons
b)
Neutrons
c)
Atoms
d)
Electrons
51.
How should you put in an Ammeter?
a)
In Parallel
b)
In Series
52.
A voltmeter should be placed ........... in a circuit
a)
in parallel
b)
in series
c)
in order
d)
upside down
53.
What does this circuit symbol represent?
a)
diode
b)
light-dependent resistor (LDR)
c)
lamp
d)
light-emitting diode
54.
What does this circuit symbol represent?
a)
diode
b)
light-dependent resistor (LDR)
c)
lamp
d)
light-emitting diode
55.

Resistivity of a wire depends on

a)

length.

b)

material

c)

cross section area.

d)

all of the above

56.

The above half wave form is created by an AC going into which circuit?

a)

single diode

b)

Bridge rectifier

c)

Transformer

d)

Voltage regulator

57.

An oscilloscope shows the current flow above what type of current is it showing?

a)

DC

b)

AC

c)

Rectified Current

d)

Non rectified current

58.
a)

DC

b)

AC

c)

rectified current

d)

non rectified current

59.

The above half wave form is created by an AC going into which circuit?

a)

single diode

b)

Bridge rectifier

c)

Transformer

d)

Voltage regulator

60.

What electrical component is used to smooth half wave current signals?

a)

Resistor

b)

Diode

c)

Capacitor

d)

Voltage regulator

61.

what is troubleshooting?

a)

It is a problem solving applied to repair failed process

b)

It is a fight between 2 computers

c)

It means..trouble ปัญหา, shoooting การยิง

62.
A means of fusing together two metal objects to create an electrical connection is called:
a)
soldering
b)
wiring
c)
programming
d)
welding
63.
The correct way to hold this object is like a:
a)
a hammer
b)
a tennis racket
c)
a pencil
d)
a football
64.
This is used to:
a)
warm up the iron
b)
clean the iron
c)
get metal onto the iron
d)
none of the above
65.
The thickness of a wire is called its:
a)
resistance
b)
amperage
c)
thickness
d)
guage
66.
Which statement is true?
a)
The light bulb will light up because the  circuit is complete.
b)
The light bulb will light up because the  circuit is broken.
c)
The light bulb will not light up because the  circuit is complete.
d)
The light bulb will not light up because the  circuit is broken.
67.

Why does the technician opening up the PSU touch the heatsinks with the screwdriver first?

a)

to eliminate static charge

b)

to make sure they are not hot

c)

for good luck

d)

to disable the PSU

68.

The four basic circuit blocks that make up a power supply respectively are:

a)

transformer, clipper, filter, regulator

b)

rectifier, clamper, filter, regulator

c)

transformer, rectifier, inverter, regulator

d)

transformer, rectifier, filter, regulator

69.
What is safety?
a)
State of free from harm
b)
A button on your 1187 Remington
c)
A pin for holding diapers on
71.
What is the human body's reaction to trauma or severe injury?
a)
Shock
b)
Jolt
c)
Wrath
71.
What is the human body's reaction to trauma or severe injury?
a)
Shock
b)
Jolt
c)
Wrath
72.
A device that opens on over current like a fuse but can be reset and reused.
a)
Relay
b)
Breaker
c)
Resistor
d)
Deflector
73.
What is a one time circuit protection device that OPENS on too much current?
a)
Fuse
b)
Resistor
c)
Switch
d)
Relay
74.
What is another name for electrical shock?
a)
Volt
b)
Jolt
c)
Bolt
d)
Colt
75.
What do we call protective safety equipment we wear?
a)
PPP
b)
PPE
c)
MICKEY
d)
Mouse

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