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Worksheets

Electronics

Total questions: 101

Worksheet time: 50mins

Name
Class
Date
1.
These components can hold phantom voltage even after they are unplugged from power.
a)
Resistors
b)
Diodes
c)
Capacitors
d)
Transistors
2.

what is the correct expression of the law of Ohm?

a)

V = R/I

b)

R = V*I

c)

I = V/R

d)

R = V*I

3.
Name this electrical component
a)
Electrolytic Capacitor
b)
Fixed Resistor
c)
Ceramic Disc Capacitor
d)
Diode
4.

Current flows from...

a)

Left to right

b)

Negative to positive

c)

Top to bottom

d)

Positive to negative

5.
Conductors have ________ electrons in their last orbit ring.
a)
1-3
b)
4
c)
5-8
d)
0
6.

4K Resolution also known as

a)

Ultra High Dimension

b)

Ultra High Definition

c)

Ultra Heavy Definition

d)

Ultra Hyper Dimension

7.

_________ App is used for Download the Apps in our LED Tv.

a)

Play Store

b)

App Store

c)

Apple Store

d)

Aptoide

8.

Operating Frequency of our TV .................?

a)

50Hz

b)

60Hz

c)

70Hz

d)

Both 50Hz & 60Hz

9.

What is the full form of HDMI

a)

High define media Interface

b)

High Decoration media Interface

c)

High Definition Multimedia Interface

d)

High Device media Input

10.

What is the resolution of 4K

a)

1600*1080

b)

3400*780

c)

3840*2160

d)

3800*2160

11.

Screen Resolution in Full HD LED Tv is

a)

2000*1080

b)

1900*720

c)

1920*1080

d)

720*1080

12.
What is the output of an OR gate if the inputs are 1 and 0?
a)
0
b)
1
c)
OFF
d)
2
13.

What was the name of the algorithm used for imaging the first ever image of black hole?

a)

EHT

b)

Interferometry

c)

CHIRP

d)

BFS & DFS

14.
a)

A

b)

B

c)

C

d)

D

15.
a)

A

b)

B

c)

C

d)

D

16.

Which form does a capacitor store energy?

a)

Magnetic field

b)

Electric pulse

c)

Electric field

d)

Electric charge

17.

An electronic Oscillator is

a)

Just like a alternator

b)

nothing but amplifier

c)

An amplifier with amplifier

d)

a converter of ac to dc energy

18.

If Barkhausen criterion is not filled by an oscillator circuit , it will

a)

Stop oscillating

b)

produce damped waves continuously

c)

becomes an amplifier

d)

produce high frequency whistles

19.

A transistor Hartley Oscillator uses

a)

Resistive Feedback

b)

Inductive Feedback

c)

Capacitive Feedback

d)

None of the above

20.

A Hartley Oscillators used for generating

a)

Very low frequency oscillation

b)

Radio frequency oscillation

c)

Microwave Oscillation

d)

Audio - Frequency oscillation

21.

A colpitts oscillator uses

a)

Tapped Coil

b)

Inductive feedback

c)

Tapped capacitance

d)

No tuned LC circuit .

22.

A Oscillator always needs an amplifier with

a)

Positive feedback

b)

Negative feedback

c)

Both type of feedback

d)

an LC tank circuit

23.

Which one of the following circuit is most suitable as an oscillator at a frequency of 100 Hz

a)

Hartley Oscillators

b)

Colpitts Oscillators

c)

Crystal Oscillators

d)

Wien bride Oscillator

24.

For sustaining Oscillations in a oscillator

a)

Feedback factor should be unity

b)

Phase shift should be unity

c)

Feedback should be negative

d)

Both a and b

25.

The bar hausen criterion for sustained oscillation is given by

a)

Aβ= 1

b)

Aβ>1

c)

Aβ<1

d)

<Aβ=180

26.

Colpitts oscillator is also known as

a)

LC Oscillator

b)

Resonant Circuit Oscillator

c)

Tank circuit Oscillator

d)

All of the above

27.

Clapp Oscillator is a

a)

LC

b)

RC

c)

RL

d)

Crystal Oscilator

28.

When constructing variable frequency oscillator among clapp oscillator and colpitts oscillator which one is preferred?

a)

Colpitts Oscillator

b)

Clapp Oscillator

c)

Hartley Oscillator

d)

Wien bridge Oscillator

29.

An oscillator produces……………. oscillations

a)

Damped

b)

Undamped

c)

Overdamped

d)

Modulated

30.

In a phase shift oscillator, we use …………. RC sections

a)

1

b)

2

c)

3

d)

4

31.

In an LC circuit, when the capacitor is maximum, the inductor energy is ……….

a)

Minimum

b)

maximum

32.

What are the 3 legs of a transistor called?

a)

Base, Electrode, Commiter

b)

Bridge, Collector, Extruder

c)

Base, Collector, Emitter

d)

Brake, Collection, Emit

33.

A transistor is essentially what?

a)

An output device

b)

An electronic switch

c)

A deivce that limits the flow of power

34.

Transistors act like tiny "____________."

a)

Electron sources

b)

Switches

c)

Batteries

d)

Bees?

35.

transistor has 3 electrodes namely

a)

PNP

b)

NPN

c)

Base/ Collector/ Emitter

d)

Drain/ Gate/ Source

36.

In a Transistor ………………..

a)

IE = IC + IB

b)

IC = IE + IB

c)

IE = IC – IB

d)

IB = IC + IE

37.

One function of the transistor is to_____________?

a)

rectify

b)

amplify

c)

limit

d)

control

38.
Emits light when a current passes through it
a)
fuse
b)
diode
c)
LED
d)
resistor
39.

How many terminals are there in a transistor....?

a)

1

b)

2

c)

3

d)

4

40.

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?


Lampu jalan menggunakan sistem kawalan elektronik yang menghidupkan lampu ketika sekitarnya gelap. Apakah sensor input sistem kawalan?

a)

Thermistor

Termistor

b)

Light emitting diode

Diod pemancar cahaya

c)

Microphone

Mikrofon

d)

Light dependent resistor

Perintang peka cahaya

41.

An LED is what?

a)

An input device

b)

An output device

c)

A processing device

42.

We use who's law to help us with circuit calculations?

a)

Resistance

b)

Volts

c)

Amps

d)

Ohms

43.

The shorter leg of an LED is what?

a)

Positive

b)

Negative

44.

The unit of charge is _________

a)

Voltage

b)

Ampere

c)

Coulombs

45.

The resistance of a uniform Conductor is directly proportional to the ________of the conductor

a)

Length

b)

Cross Sectional Area

c)

Conductivity

46.

In a material where the resistance INCREASES with an increase in temperature, the material is said to have a ____________

a)

Neutral Temperature Coefficient

b)

Positive Temperature Coefficient

c)

Negative Temperature Coefficient

47.

________ is the capacity of energy

a)

Current

b)

Voltage

c)

Power

48.

You are given a resistor whose stripes are colored from left to right as orange, orange, brown, silver. Find the resistance value.

a)

330 Ohms

b)

33KOhms

c)

3.3 Mega Ohms

49.

What is this ?

a)

Fixed Resistor

b)

Resistor

c)

Variable Resistor

50.

If the volatge is 20V and the current flowing through the circuit is 2 mA . What is the resistance?

a)

100 Ohms

b)

1 K Ohms

c)

10k Ohms

51.

Look at this & say What type of source

a)

Current Source

b)

Voltage Source

c)

Independent Source

52.

What is the Name of this source?

a)

Current Source

b)

Resistive Source

c)

Voltage Source

53.

___________is the central part of an atom.

a)

Protons

b)

Neutrons

c)

Nucleus

54.

The ECU in the electronic control system, receives signals from the sensors and determines the opening time for the injectors land which also controls the injection volume

a)

True

b)

False

55.

The fuel is injected into the inlet manifold of each cylinder at _____________ timing.

a)

same

b)

different

c)

unpredictable

d)

none of the mentioned

56.

The function of the ignition system is to _____________ the flame propagation process.

a)

Stop

b)

Initiate

c)

Balance

d)

None

57.

In battery ignition system, the energy required for producing spark is obtained from a _____________ battery.

a)

6v to 12v

b)

12v to 24v

c)

24v to 30v

d)

None

58.

The purpose of the spark advance mechanism is to assure that under every condition of engine operation, ignition takes place at the most favourable instant in time.

a)

True

b)

False

59.

In a spark ignition engine combustion which is initiated between the spark plug electrodes spreads across the combustible mixture.

a)

True

b)

False

60.

The main task of battery in automobile is to

a)

Supply electricity to the alternator

b)

Act as a reservoir or stabilizer of electricity

c)

Supply electricity to the vehicle&electrical system at all times while the engine is running

d)

Supply a large amount of power to turn the starter motor when the engine is being started

61.

In an alternator, which component controls the output?

a)

Voltage regulator

b)

Cut out relay

c)

Current regulator

d)

Diode

62.

What is the material of an alternator frame?

a)

Cast iron

b)

Brass

c)

Copper

d)

Aluminum

63.

At the start of the engine, the charging voltage is _______

a)

Lower

b)

Higher

c)

Same

d)

Zero

64.

The purpose of the dynamo in an automobile is to

a)

Supply electric power

b)

Convert mechanical energy to electrical energy

c)

Partly convert engine power into electric power

d)

Continually recharge the battery

65.

The starting system includes

a)

A battery, a starter, and an ignition switch

b)

A battery, a distributor, and an ignition switch

c)

A battery, a starter, and a distributor

d)

A distributor, a starter, and an ignition switch

66.

The induction coil steps up low voltage current of 6 or 12 volts to high voltage current upto about

a)

10,000 volts

b)

17,000volts

c)

25,000volts

d)

35,000volts

67.

3-In ignition coil, the ratio between the number of turns of primary and secondary windings is about

a)

1 to 50

b)

1 to 100

c)

1 to 200

d)

1 to 400

68.

The distributor serves the following purposes in the ignition system

a)

It operates break and make mechanism

b)

It distributes high tension current to spark plug at correct time

c)

Both A and B

d)

None

69.

11-A solid state switch, known as Thyristor is employed in

a)

Battery coil ignition system

b)

Magneto Ignition system

c)

Electronic Ignition system

d)

Capacitive discharge Ignition system

70.

The following is (are) the advantage(s) of Electronic Ignition system

a)

Produces maximum output voltage

b)

Better starting with cold engine

c)

Less possibility of arcing at spark plug

d)

All of the above

71.

The flywheel and the pressure plate bind the clutch disc between them so that the engine and the transmission can be engaged.

a)

Yes

b)

No

72.

The main function of intake manifold is that it

a)

promotes the mixture of air and fuel

b)

reduces intake noise

c)

Cools the intake air to a suitable temperature

d)

Distributes intake air equally to the cylinders

73.

If the air-fuel mixture ignites before the spark takes place at spark plug, the condition is called

a)

Detonation

b)

Ignition

c)

Pre-ignition

d)

Rumble

74.
What is the number value for green in the color code chart?
a)
6
b)
4
c)
2
d)
5
75.
What does the 3rd band on a resistor represent?
a)
A number
b)
The Tolerance level
c)
The multiplier
d)
The electronic range
76.

The atomic Number of the element is the number of protons and is represented by

a)

A

b)

X

c)

Z

77.

Electricity is the flow of _________ due to a difference in electrical charge between two points

a)

Electrons

b)

Voltage

c)

EMF

78.

What is the SI unit Of Voltage

a)

Farad

b)

Volt

c)

Ohms

79.

What is the SI Unit of Current

a)

Watts

b)

Volt

c)

Ampere

80.

The first generation in electronics is

a)

Transistor

b)

Vaccum Tubes

c)

IC'S

81.

The forward voltage drop across a Germanium diode is about …………………

a)

3.3 V

b)

2.7 V

c)

0.7 V

d)

0.3 V

82.

The reverse current in a diode is of the order of ………………

a)

kA

b)

mA

c)

uA

d)

A

83.

The forward voltage drop across a Germanium diode is about …………………

a)

3.3 V

b)

2.7 V

c)

0.7 V

d)

0.3 V

84.

A zener diode is always ………… connected.

a)

Forward

b)

Reverse

c)

Either reverse or forward

85.

In the breakdown region, a zener diode behaves like a …………… source.

a)

Constant voltage

b)

Constant Resistance

c)

Constant Current

86.

The ripple factor of a half-wave rectifier is …………………

a)

0.48

b)

1.21

c)

2

d)

2.5

87.

There is a need of transformer for ………………..

a)

Half wave rectifier

b)

Centre tap full wave rectifier

c)

Bridge full wave rectifier

d)

None of the above

88.

The PIV rating of each diode in a bridge rectifier is ……………… that of the equivalent centre-tap rectifier

a)

same

b)

twice

c)

half

d)

three times

89.

If the PIV rating of a diode is exceeded, ………………

a)

the diode conducts poorly

b)

the diode is destroyed

c)

the diode behaves like a zener diode

d)

none of the above

90.

The maximum efficiency of a half-wave rectifier is ………………..

a)

91.3

b)

66.6

c)

40.6

d)

80.2

91.

In a PN junction with no external voltage, the electric field between acceptor and donor ions is called a

a)

Peak

b)

Barrier

c)

threshold

d)

Path

92.

In a PN junction the potential barrier is due to the charges on either side of the junction, these charges are

a)

Majority Carriers

b)

Minority Carriers

c)

Both of the above

d)

Fixed Donor and Acceptor ions

93.

The capacitance of a reverse biased PN junction

a)

Increases as reverse bias is increased

b)

Decreases as reverse bias is decreased

c)

Increases as reverse bias is decreased

d)

Is insignificantly low

94.

When a diode is forward biased, the voltage across it

a)

is inversely proportional to the current

b)

is directly proportional to the current

c)

remains approximately the same

d)

is directly proportional to the source voltage

95.

Which capacitance dominates in the reverse-bias region?

a)

Depletion Capacitane

b)

Diffusion Capacitance

c)

Transition Capacitance

d)

None of the above

96.

The diffused impurities with ________ valence electrons are called donor atoms.

a)

4

b)

3

c)

5

d)

0

97.

Zin for ideally should be--------

a)

infinite

b)

zero

c)

one

98.

Zin of the amplifier should be --------than sorece resistance

a)

equal

b)

lesser

c)

greater

99.

By pass capacitors -------the gain of the amplifier

a)

increases

b)

reduces

c)

does not do any change in

100.

RE helps to maintain ------- of the amplifier stability.

a)

Q point

b)

resistance

c)

current

101.

Mark the Q point another name ---------

a)

Bias point

b)

Operating point

c)

Quiescent Point

d)

voltage point

e)

current point

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