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Worksheets

electronics

Total questions: 68

Worksheet time: 38mins

Name
Class
Date
1.
What electronic component allows current to flow in one direction only? 
a)
Resistor
b)
LED
c)
Didode
d)
Switch
2.
Glass is a good conductor.
a)
True
b)
False
3.
Electrons have a positive charge.
a)
True
b)
False
4.
The nucleus of an atom contains protons and?
a)
Electrons
b)
Neutrons
5.
Which of the materials is not a good conductor?
a)
Copper
b)
Silver
c)
Aluminum
d)
Mica
6.
Electronics is the science and technology concerned with regulating flow of:
a)
Heat
b)
Electricity
c)
Water
d)
Power
7.

Which component resists the flow of current in an electrical circuit?

a)

Resistor

b)

Inductor

c)

Capacitor

d)

Transistor

8.
A device that opens on over current like a fuse but can be reset and reused.
a)
Relay
b)
Breaker
c)
Resistor
d)
Deflector
9.
These components can hold phantom voltage even after they are unplugged from power.
a)
Resistors
b)
Diodes
c)
Capacitors
d)
Transistors
10.
What is the purpose of a safety observer?
a)
Remove Power and call for help in an accident
b)
Insure safety glasses are worn
c)
take over in an accident
11.

what type of device is this?

a)

it is a transistor

b)

it is a diode

c)

it is an amplifier

d)

it is a power supply

12.

what is this?

a)

it is a transistor

b)

it is a diode

c)

it is a capacitor

d)

it is a resistance

13.

what is a transistor?

a)

a current amplifier

b)

a rectifier

c)

a power supply

d)

an adder device

14.

what is an oscillator?

a)

an amplifier

b)

a power supply

c)

a multimeter

d)

a signal generator

15.
Conductors have ________ electrons in their last orbit ring.
a)
1-3
b)
4
c)
5-8
d)
0
16.
Protons have a __________ charge.
a)
Negative
b)
Neutral
c)
Positive
d)
Slightly Negative
17.
Neutrons are found in the __________ of an atom.
a)
Plasma
b)
Outside branch
c)
Membrane
d)
Nucleus
18.
How many electrons are in a full valence band?
a)
6
b)
8
c)
4
d)
2
19.
Insulators will restrict what component?
a)
Watts
b)
Volts
c)
Ohms
d)
Amps
20.
Electricity is created through the __________ of electrons.
a)
Movement
b)
Restriction
c)
Merging
d)
Melting
21.
Semiconductors have ________ electrons in the outer ring.
a)
2
b)
4
c)
6
d)
8
22.
Plastic is an example of a good __________.
a)
Insulator
b)
Conductor
c)
Semiconductor
d)
Voltage source
23.

Identify the electronic symbol.

a)

Line power

b)

Supply

c)

Ground

d)

Earth

24.

Identify the electronic symbol.

a)

Diode

b)

Photodiode

c)

Reflective diode

d)

Light Emitting Diode

25.

Identify the electronic symbol.

a)

NPN transistor

b)

Transistor

c)

PNP transistor

d)

Bipolar transistor

26.

Identify the electronic symbol.

a)

Relay

b)

Contactor

c)

Coil with switch

d)

Inductor and switch

27.
Name this electrical component
a)
Jump Wire
b)
Fixed Resistor
c)
Capacitor
d)
Diode
28.
Name this electrical component
a)
Jump Wire
b)
Fixed Resistor
c)
Potentiometer
d)
Diode
29.
Name this electrical component
a)
Ceramic Disc Capacitor
b)
Fixed Resistor
c)
Potentiometer
d)
Electrolytic Capacitor
30.

This picture shows...

a)

plumbing diagram

b)

electrical diagram

c)

schematic diagram

d)

resistance diagram

31.

If too much current flows to the fuse, the metal link inside the fuse will.....

a)

splice

b)

melt

c)

bind

d)

trip

32.

Fuses are safety devices that provide...

a)

frequency protection

b)

overcurrent protection

c)

voltage protection

d)

capacitance protection

33.

The word 'alloy' means...

a)

stop

b)

lut

c)

ostrze

d)

topić się

34.

Which of the following is NOT a property of a cathode rays?

a)

They travel in straight lines

b)

They are deflected by an electric field

c)

They are not affected by gravity

d)

They have momentum and energy

35.

Which of the following shows the correct path of an electron beam in a magnetic field?

a)
b)
c)
36.

Figure shows a trace displayed on the screen of a C.R.O. The Y-gain is set to 5 V cm-1 What is the peak voltage?

a)

0 V

b)

5 V

c)

20 V

d)

25 V

37.

Figure shows a bulb and a diode connected to a battery in series. When switch, S is closed, the bulb does not light up. The bulb can be lighted up by

a)

replacing the wire connecting to the bub

b)

increasing the number of dry cells

c)

reversing the connection of the battery

d)

connecting a resistor parellel to the bulbb

38.

An n-type semiconductor is produced when some 0f the germanium atoms are replaced with

a)

divalent atoms

b)

trivalent atoms

c)

tetravalent atoms

d)

pentavalent atoms

39.

A capacitor is used to smooth out the output voltage of a half-wave rectifier. In which of the following circuits is the capacitor correctly connected?

a)
b)
c)
d)
40.

Figure shows an npn transistor connected in a circuit. Which of the following is true?

a)

Ic>IB>IEI_c>I_B>I_E

b)

IE>IC>IBI_E>I_C>I_B

c)

IB>IC>IEI_B>I_C>I_E

d)

IC>IE>IBI_C>I_E>I_B

41.

The truth tables for two logic gates P and Q are shown in Table 4.2 and Table 4.3 respectively. When the output of P is connected to the input of Q, the resulting combination is equivalent to a single

a)

NOT gate

b)

OR gate

c)

NAND gate

d)

NOR gate

42.

Table 4.4 gives a truth table of a combination of logic gates. Which of the following combination yields this truth table?

a)
b)
c)
d)
43.
What is the name of the following component
a)
AND gate
b)
OR gate
c)
NAND gate
d)
NOR gate
44.
Which circuit will act as a variable potential divider? 
a)
A
b)
B
c)
C
d)
D
45.
The circuit shown contains a light dependent resistor (LDR) and an ammeter, in series with a battery.
How does the circuit behave when more light shines on it? 
a)
resistance of LDR - decreases
current through ammeter - decreases
b)
resistance of LDR - decreases
current through ammeter - increases
c)
resistance of LDR - increases
current through ammeter - decreases
d)
resistance of LDR - increases
current through ammeter - increases
46.
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 
47.
Which electrical component would not normally be found in a battery-operated torch (flashlight)? 
a)
A
b)
B
c)
C
d)
D
48.
Which graph shows the output of a simple a.c. generator? 
a)
A
b)
B
c)
C
d)
D
49.
Which statements describe a NAND gate?
 
a)
I and II
b)
I and III
c)
II and III
d)
 I, II and III
50.

forward bias

a)

Junction or branch point in a circuit.

b)

When the voltage on a P-type material is more negative than the voltage on its related N-type material.

c)

When the voltage on an N-type material is more negative than the voltage on its related P-type material.

d)

Fixed or variable series resistors connected across a voltage to obtain a desired fraction of that voltage.

51.

capacitance

a)

is the flow of electrons through a conductor.

b)

The ability of a capacitor to store an electrical charge.

c)

Related to static electric charge.

d)

Quantity of electrical energy.

52.

voltage drop

a)

Unit of potential difference or electromotive force.

b)

Term used to designate electrical pressure or force that causes current to flow.

c)

a relative excess of electrons compared to some other point.

d)

Voltage or difference in potential developed across a component due to current flow.

53.

An intentional or accidental conducting path between an electrical system or circuit and the earth or some conducting body acting in place of the earth.

a)

ground

b)

impedance

c)

rectification

d)

scientific notation

54.

What is the name of this component?

a)

LED

b)

LDR

c)

Diode

d)

Lamp

55.

What is the full name of this component?

a)

LDR

b)

LED

c)

Variable resistor

d)

Light Dependant Resistor

56.

What is the name of this component?

a)

Switch

b)

Transistor

c)

Voltage Divider

d)

Relay

57.

What is the name of this component?

a)

Temperature Sensor

b)

Thermometer

c)

Transistor

d)

Thermistor

58.

What is the name of this component?

a)

Thermistor

b)

Transistor

c)

Variable Resistor

d)

Resistor

59.

What is the name of this component?

a)

Switch

b)

Transistor

c)

Voltmeter

d)

Relay

60.

Doping is a process of adding a certain amount of specific impurities to semiconductor. What is the purpose of doping?

a)

To increase the resistance of semiconductor

b)

To increase the thermal energy of semiconductor

c)

To increase the temperature of the semiconductor

d)

To increase the conductivity of the semiconductor

61.

Diagram 9 shows three electrical circuit with different components P, Q and R connected across terminal X and Y. Table shows the condition of the bulb before and after the terminals of battery is reversed. What are the components for P Q and R?

a)

P: Capacitor

Q: Resistor

R: Diode

b)

P: Diode

Q: Capacitor

R: Resistor

c)

P: Resistor

Q: Diode

R: Capacitor

d)

P: Capacitor

Q: Diode

R: Resistor

62.

A cathode ray oscilloscope (CRO) is connected in a circuit as shown in Diagram 10. Which of the following trace is produced by the Cathode Ray Oscilloscope screen in the circuit?

a)
b)
c)
d)
63.

Diagram 11 shows a circuit with a bulb that does not light up. Which of the following actions will make the bulb light up?

a)

Connecting a fuse to the circuit

b)

Reversing the battery connection

c)

Changing the power supply to a 3V battery

d)

Reversing the bulb connection

64.

Diagram 12 shows the arrangement of silicon atoms after an atom X is doped to form an extrinsic semiconductor. Which of the following is true?

a)

The conductivity of the semiconductor decreases.

b)

The semiconductor becomes a p-type.

c)

The majority charge carrier is electron.

d)

Atom X is a trivalent atom

65.

Diagram 13 shows five identical bulbs P, Q, R, S and T in a circuit. Which bulbs light up continuously when the switch is on?

a)

P, Q and T only

b)

Q and S only

c)

R and S only

d)

P and R only

66.

Which of the following circuits shows the forward-biased arrangement of a diode?

a)

A

b)

B

c)

C

d)

D

67.

What is the function of a diode?

a)

Acts as a current amplifier

b)

Acts as an automatic switch

c)

Stores electric charge

d)

Allows the current to pass in one direction only

68.

Diagram 14 shows a full-wave rectification circuit. Which one of the possible paths of current flow?

a)

T→P→Q→V→W→S→R→U

b)

T→P→S→W→V→Q→P→T

c)

U→R→S→P→Q→V→W→S→P→T

d)

U→R→Q→V→W→S→R→U

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