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Electronics form 5

Total questions: 66

Worksheet time: 1hrs 6mins

Name
Class
Date
1.
a)
b)
c)
d)
2.
a)
b)
c)
d)
3.
a)
b)
c)
d)
4.
a)
b)
c)
d)
5.
a)
b)
c)
d)
6.
a)
b)
c)
d)
7.
a)

Capacitors

b)

Resistors

c)

Inductors

d)

Batteries

8.
a)

Battery

b)

Capacitor

c)

Resistor

d)

Inductor

9.

A _______ is an instrument used widely in circuits to display and make measurements on voltage waveforms

a)

Cathode Ray Oscilloscope

b)

fluorescent screen

c)

plasma screen

d)

voltmeter

10.

A device that can measure current, voltage and resistance is called a _______________

a)

ammeter

b)

rheostat

c)

variable instrument

d)

multimeter

11.

The main function of a capacitor is to

a)

resist the flow of electrons

b)

store charge

c)

dissipate heat

d)

turn AC electricity into DC

12.

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

13.

The following circuit diagrams show four diodes connected to an a.c power supply.

Which circuit will make the bulb lights up the brightest?

a)
b)
c)
d)
14.

Diagram below shows a cathode being heated by a filament.

Which particle is emitted from the cathode?

a)

Proton

b)

Neutron

c)

Electron

d)

Alpha

15.

Which statement about a transistor is correct?

a)

Has two electrodes

b)

Acts as a full wave rectifier

c)

Has its own internal energy supply

d)

Functions as an amplifier

16.

Diagram below shows an electronic symbol representing an electronic component.

What is the electronic component?

a)

Diode

b)

Inductor

c)

Resistor

d)

Transistor

17.

Diagram 24 shows four diodes which are connected to form a rectifier. Which wave pattern is produced on the C.R.O. screen?

a)
b)
c)
d)
18.

Which particle is cathode ray?

a)

Electron beam

b)

Gamma ray

c)

Neutron

d)

Alpha particles

19.

What is the symbol for n-p-n transistor?

a)
b)
c)
d)
20.

Diagram shows a shadow formed on the screen of a Maltese Cross Tube. The shadow is deflected by the magnets.

The direction of the deflection is determined by using

a)

the Fleming’s left hand rule

b)

the Fleming’s right hand rule

c)

the right hand grip rule

21.

The doping process of pure semiconductor with pentavalent element will

a)

cause the semiconductor to be negatively charged

b)

produce p-type semiconductor

c)

cause the resistance of the semiconductor to increase

d)

produce majority charged carrier which are electrons

22.

Diagram shows the structure of a cathode ray oscilloscope.

Which component, A, B, C, or D causes the electrons to accelerate?

a)

A

b)

B

c)

C

d)

D

23.

A light-dependent resistor (LDR) is a resistor which is sensitive to light. The resistance of the

LDR is low when surrounding is bright and high in the dark.

Which circuit will light up the bulb at night?

a)
b)
c)
d)
24.

Which statement is correct about n-type semiconductor?

a)

Doped with pentavalent atom

b)

Doped with trivalent atom

c)

More free electrons than holes

d)

Holes are the majority charge carrier

25.

The diagram shows a circuit consisting of a diode and a bulb.

When the switch is on, the bulb does not light up.

What needs to be done to light up the bulb?

a)

Replace with a new bulb

b)

Increase the number of dry cells

c)

Reverse the diode connection

d)

Connect a resistor parallel to the bulb

26.

Which circuit will light up the bulbs?

a)
b)
c)
d)
27.

Which of the following diagrams is an n-type semiconductor?

a)
b)
c)
d)
28.

The adding of impurity into pure semiconductor material is known as

a)

doping

b)

rectification

c)

amplification

d)

thermionic emission

29.

Resistance in an electrical circuit is measured in:

a)

Volts (V)

b)

Amps (A)

c)

Farads (F)

d)

Ohms (Ω)

30.

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

a)

Resistor

b)

Diode

c)

Transistor

d)

Capacitor

31.

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

32.

Which one of these is a use of LDR

a)

Tubelight

b)

Street lights

c)

Fan

d)

Sun

33.

This sensor is used for burglar alarms

a)

Temperature

b)

Humidity

c)

Movement/Motion

d)

PH

34.
Two like charges
a)
 neutralize each other.
b)
repel each other. 
c)
must be neutrons. 
d)
attract each other.
35.

Transistors act like tiny "____________."

a)

Electron sources

b)

Switches

c)

Batteries

d)

Bees?

36.

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

37.

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

38.

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

39.

One function of the transistor is to_____________?

a)

rectify

b)

amplify

c)

limit

d)

control

40.

transistor has 3 electrodes namely

a)

PNP

b)

NPN

c)

Base/ Collector/ Emitter

d)

Drain/ Gate/ Source

41.
Emits light when a current passes through it
a)
fuse
b)
diode
c)
LED
d)
resistor
42.

Our 9 volt batteries have this type of current

a)

variable

b)

indirect

c)

alternating

d)

direct

43.

When a switch is open the lamp...

a)

Will be on

b)

Will be off

c)

Will be making a short circuit

44.

An example of a good insulator is

a)

Copper

b)

Plastic

c)

Water

d)

aluminum

45.

Which is the most efficient type of light bulb?

a)

Incandescent

b)

Fluorescent

c)

CFL

d)

LED

46.

What does this schematic symbol represent?

a)

Capacitor

b)

Lamp

c)

Resistor

d)

Battery

47.

What does this schematic symbol represent?

a)

Wire

b)

Resistor

c)

Lamp

d)

Switch

48.

What does this schematic symbol represent?

a)

Lamp

b)

Wire

c)

Switch

d)

Resistor

49.

What does this schematic symbol represent?

a)

Switch

b)

Lamp

c)

Wire

d)

Resistor

50.

The two connectors on the battery are called...

a)

Resistors

b)

Terminals

c)

Switches

d)

Snaps

51.

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

52.
Current is measured in:
a)
volts
b)
amperes
c)
ohms
d)
watts
53.
Resistance is measured in:
a)
volts
b)
amps
c)
ohms
d)
watts
54.
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 
55.

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

a)

Circuit

b)

Resistance

c)

Electron

d)

Current

56.

What is the act of electricity passing throught an object

a)

Charge

b)

Resistance

c)

Ampere

d)

Conduct

57.

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

58.
What 'flows' in a wire?
a)
Protons
b)
Neutrons
c)
Atoms
d)
Electrons
59.
How should you put in an Ammeter?
a)
In Parallel
b)
In Series
60.
A voltmeter should be placed ........... in a circuit
a)
in parallel
b)
in series
c)
in order
d)
upside down
61.
What does this circuit symbol represent?
a)
diode
b)
light-dependent resistor (LDR)
c)
lamp
d)
light-emitting diode
62.
What does this circuit symbol represent?
a)
diode
b)
light-dependent resistor (LDR)
c)
lamp
d)
light-emitting diode
63.

Resistivity of a wire depends on

a)

length.

b)

material

c)

cross section area.

d)

all of the above

64.
a)

DC

b)

AC

c)

rectified current

d)

non rectified current

65.

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

66.

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

a)

Resistor

b)

Diode

c)

Capacitor

d)

Voltage regulator

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