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Mühazirə 1: Basic Circuit Concepts

Total questions: 77

Worksheet time: 39mins

Name
Class
Date
1.

In what type of circuit is the total resistance smaller than the smallest resistance?

a)

Parallel circuits of diodes

b)

Serial circuits of inductors

c)

Parallel circuits of capacitors

d)

Parallel circuits of resistors

e)

Serial circuits of resistors

2.

How should one measure current and voltage in a circuit?

a)

both ammeter and voltmeter in series

b)

both ammeter and voltmeter in parallel

c)

ammeter in parallel, voltmeter in series

d)

ammeter in series, voltmeter in parallel

e)

there is no correct answer

3.

The smallest unit of an element is:

a)

A molecule

b)

A compound

c)

An atom

d)

An electron

e)

Nucleus

4.

Component that Convert AC to DC and allow current to flow in one Direction

a)

Capacitor

b)

Diode

c)

Inverter

d)

Tristor

e)

Resistor

5.

Anode is ________ Polarity in diodes

a)

Negative

b)

Positive

c)

Hot Side

d)

Ground

e)

Neutral

6.

Types of diodes used in lighting system and display

a)

LED

b)

schottky diodes

c)

rectifier diodes

d)

transistor

e)

zener diodes

7.

Diodes is Categorize as ?

a)

Passive components

b)

Active components

c)

there is no correct answer

d)

Conductor

e)

Insulator

8.

Diode has polarity

a)

output and input

b)

anode and cathode

c)

base and collector

d)

on and off

e)

emitter and base

9.

Main phenomenons associated with formation of p-n junctions are

a)

Diffusion and Drift

b)

Drift only

c)

Diffusion only

d)

only doping

e)

none of the above

10.

Characteristics of a diode that helps in rectification

a)

Allows Unidirectional flow of current

b)

Opposes the flow of current

c)

Allows Bidirectional flow of current

d)

conducts in reverse biased

e)

none of the above

11.

In the forward bias arrangement of a p-n junction diode,

a)

the n-end is connected to the positive terminal of the battery

b)

the p-end is connected to the positive terminal of the battery

c)

the direction of current is from n-end to p-end in the diode

12.

During formation of p–n junction

a)

a hole diffuses from p to n side

b)

an electron diffuses from n to p side

c)

a hole diffuses from n to p side

d)

an electron diffuses from emitter to base

e)

an electron diffuses from p to n side

13.

Which of the following is a pentavalent impurity added while forming an extrinsic semiconductor?

a)

Indium

b)

Boron

c)

Copper

d)

Gallium

e)

Arsenic

14.

The reverse saturation current in a PN Junction diode is only due to

a)

acceptor ions

b)

minority carriers

c)

donor ions

d)

majority carriers

e)

none of the above

15.

The process of adding an impurity to an intrinsic semiconductor is called

a)

Atomic modification

b)

Recombination

c)

Ionization

d)

none of the above

e)

Doping

16.

Transistors rely on ________, materials that are neither pure insulators nor pure conductors.

a)

integrated circuits

b)

diodes

c)

semiconductors

d)

semi‑insulators

e)

metals

17.

Which lead of the following is not a transistor lead?

a)

there is no correct answer

b)

Collector

c)

Emitter

d)

Base

e)

Anode

18.

On an NPN transistor symbol, which lead does the arrow point to?

a)

Emitter

b)

Base

c)

Collector

d)

Anode

e)

Cathode

19.

Which of the following acts as a controller for the flow of electricity through a transistor?

a)

Collector

b)

Base

c)

Anode

d)

Emitter

e)

Cathode

20.

In modern electronics, transistors are typically grouped in large numbers on:

a)

breadboards

b)

integrated circuits

c)

printed circuit boards

d)

there is no correct answer

e)

computer terminals

21.

One function of the transistor is to ____________?

a)

there is no correct answer

b)

limit

c)

rectify

d)

control

e)

amplify

22.

Transistor has 3 electrodes namely

a)

Base, Collector, Emitter

b)

Drain, Gate, Source

c)

Anod, cathode

d)

PNP

e)

NPN

23.

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

a)

1

b)

3

c)

2

d)

5

e)

4

24.

A transistor is a ……………. operated device

a)

Resistance

b)

Voltage

c)

None of the Above

d)

Current

e)

Both Voltage and Current

25.

What does BJT stand for??

a)

Bipolar Junction Thermistor

b)

Bipolar Junction Transistor

c)

None of the Above

d)

Binary Junction Transistor

e)

Binary Junction Thermistor

26.

Which of the followings are a possible applications of BJT??

a)

charging and discharging

b)

Amplification

c)

Rectification

d)

Oscillation

e)

None of the Above

27.

What are the two main types of transistors?

a)

Bipolar and Field Effect

b)

NPN and PNP

c)

Switch and Amplifier

d)

Anod and Cathod

e)

Resin and Metal

28.

What is the primary function of a heat sink in high-power transistors?

a)

To protect internal parts

b)

To remove unwanted heat

c)

None of the Above

d)

To amplify signals

e)

To control circuits

29.

Which pin configuration is typical for resin body transistors with a flat edge?

a)

Left: Base, Middle: Collector, Right: Emitter

b)

Left: Base, Middle: Emitter, Right: Collector

c)

Left: Collector, Middle: Base, Right: Emitter

d)

Left: Anode, Middle: Emitter, Right: Cathode

e)

Left: Emitter, Middle: Base, Right: Collector

30.

In an NPN transistor, what happens when the switch on the control circuit is pressed?

a)

Current flows only in the main circuit

b)

None of the Above

c)

Current flows in both the main and control circuits

d)

No current flows

e)

Current flows only in the control circuit

31.

What is the direction of conventional current in an NPN transistor circuit?

a)

From base to emitter

b)

From emitter to collector

c)

From anode to cathode

d)

From negative to positive

e)

From positive to negative

32.

What material is an example of a semiconductor?

a)

Copper

b)

Aluminium

c)

Helium

d)

Rubber

e)

Silicon

33.

What is the purpose of doping silicon in transistors?

a)

To change its electrical properties

b)

To make it more durable

c)

To make it more flexible

d)

To decrease its size

e)

To increase its size

34.

What is created at the junction of P-type and N-type materials?

a)

None of the Above

b)

A valence shell

c)

A covalent bond

d)

A conduction band

e)

A depletion region

35.

What happens to the electrons in a reverse-biased NPN transistor?

a)

They move towards the positive terminal

b)

They move towards the negative terminal

c)

They stay in the base

d)

They stay in the emitter

e)

They stay in the cathode

36.

What is the process called when silicon atoms share electrons to get their desired eight electrons?

a)

Covalent bonding

b)

Ionic bonding

c)

Metallic bonding

d)

Hydrogen bonding

e)

Van der Waals bonding

37.

Which bonding type predominantly holds atoms together in elemental semiconductors like silicon?

a)

Ionic bonding transfers complete electrons

b)

Hydrogen bonding links polar molecules

c)

Covalent bonding forms shared electron pairs

d)

Metallic bonding uses delocalized electrons

38.

Which region of a bipolar transistor is intentionally the most highly doped for efficient carrier injection?

a)

Both emitter and collector equally doped

b)

Base region for minimal recombination

c)

Collector region for high breakdown

d)

Emitter region for strong carrier injection

39.

When a BJT operates as a linear amplifier, which junction is forward biased?

a)

Emitter–base junction is forward biased

b)

Collector–base junction is forward biased

c)

Emitter–collector junction is forward biased

d)

No junction is forward biased

40.

What particles constitute the atomic nucleus?

a)

Protons and neutrons together

b)

Electrons and protons together

c)

Only electrons inside nucleus

d)

Electrons and neutrons together

41.

Copper, silver, and gold are best classified as which electrical materials?

a)

Good conductors of electricity

b)

Typical semiconductors materials

c)

Common electrical insulators

d)

Super insulators of charge

42.

The loss of valence electrons from an atom is referred to as what process?

a)

Attenuation reducing wave amplitude

b)

Amplification of signal carriers

c)

Electronic excitation to higher state

d)

Ionization removing outer electrons

43.

In p‑type semiconductor material, the majority carriers are which entities?

a)

Electrons as negative carriers

b)

Current as a flowing quantity

c)

Holes act as positive carriers

d)

Electricity as an energy form

44.

How many fundamental categories do intrinsic semiconductors fall into?

a)

One type defined by pure crystal

b)

Two types defined by doping

c)

Three types defined by mobility

d)

Four types defined by bands

45.

Silicon that exhibits mobile holes rather than electrons as majority carriers is called what type?

a)

z‑type silicon hypothetical

b)

p‑type silicon with acceptors

c)

h‑type silicon high mobility

d)

n‑type silicon with donors

46.

What term best describes a material whose conductivity lies between that of conductors and insulators?

a)

Semiconductor with moderate conductivity

b)

Conductor with very low resistance

c)

Insulator with extremely high resistance

d)

Brass as a specific alloy material

47.

Which statement correctly distinguishes unipolar JFET operation from bipolar transistor operation?

a)

BJT conduction uses phonon scattering only

b)

JFET conduction uses minority carriers only

c)

JFET conduction uses majority carriers only

d)

BJT conduction uses only majority carriers

48.

In an n‑channel JFET at zero gate‑source bias, what forms the conductive path between source and drain?

a)

An n‑type channel of electrons

b)

A p‑type channel of holes

c)

A metallic inversion layer

d)

A depleted channel of ions

49.

Increasing the reverse bias at the JFET gate primarily causes which effect in the channel?

a)

Carrier generation increases channel width

b)

Ohmic heating creates new carriers

c)

Wider depletion reduces channel width

d)

Narrower depletion increases channel width

50.

Which of the following is a semiconductor?

a)

Copper

b)

Silicon

c)

Brass

d)

Plastic

e)

Gold

51.

Which is one of the properties of semiconductor?

a)

Semiconductors can be pure element such as silicon or germanium.

b)

Semiconductor has 2 types of charge carriers.

c)

atoms vibrate causes electron to break free from the bonds.

d)

4 electrons in outermost orbit, in covalent bonding.

e)

None of the Above

52.

The JFET is

a)

a unipolar device & a voltage-controlled device

b)

a unipolar device

c)

a voltage-controlled device

d)

a current-controlled device

e)

a unipolar device & a current-controlled device

53.

The channel of a JFET is between the

a)

gate and source

b)

input and output

c)

base and emitter

d)

drain and source

e)

gate and drain

54.

A JFET always operates with

a)

the gate connected to the source

b)

None of the Above

c)

the gate to source p-n junction forward-biased

d)

the drain connected to ground

e)

the gate to source p-n junction reverse-biased

55.

Drain current in the constant-current region increases when

a)

the gate-to-source bias voltage increases

b)

the drain-to-source voltage decreases

c)

the drain-to-source voltage increases

d)

None of the Above

e)

the gate-to-source bias voltage decreases

56.

At cutoff, the JFET channel is

a)

reverse-biased

b)

None of the Above

c)

extremely narrow

d)

at its widest point

e)

completely closed by the depletion region

57.

To be used as a variable resistor, a JFET must be

a)

None of the Above

b)

biased at pinch-off

c)

forward-biased at the gate

d)

biased in the saturation region

e)

biased in the ohmic region

58.

A MOSFET differs from a JFET mainly because

a)

the JFET has a p-n junction

b)

of the power rating

c)

MOSFETs do not have a physical channel

d)

the MOSFET has two gates

e)

None of the Above

59.

What are the most widely used semiconductor elements in technology?

a)

Indium and aluminum

b)

Metal oxides

c)

Copper and silver

d)

Arsenium and phosphorus

e)

Germanium and silicon

60.

What does LED stand for?

a)

Light Emitting Diode

b)

Light Emitting Display

c)

Light Emitting Detector

d)

Light Energy Display

e)

Light Energy Detector

61.

Name the three leads of a common transistor

a)

Collector Base Emitter

b)

Emitter Collector Bias

c)

Collector Bias Omitter

d)

Anod and Cathod

e)

Base Collector Case

62.

Connecting a lead from the negative to the positive of a battery will produce:

a)

A high resistance circuit

b)

An open circuit

c)

A low current path

d)

A short circuit

e)

Diode circuit

63.

If two resistors are placed in series, is the final resistance:

a)

None of the Above

b)

Lower

c)

Higher

d)

Cannot be determined

e)

The same

64.

To obtain a higher value of resistance, resistors are connected in:

a)

Parallel

b)

Reverse

c)

perpendicular

d)

Forward

e)

Series

65.

What units does the electrical current have?

a)

a square

b)

Amps

c)

Volts

d)

Power

e)

Om

66.

What is the symbol of a bulb?

a)

A circle with an x

b)

A square

c)

A rectangle

d)

One big and one small line

e)

A romb

67.

What type of circuit do we find in our houses?

a)

Parallel

b)

Series

c)

Star-Delta

d)

Series-Parallel

e)

None of them

68.

What is the function of an ammeter?

a)

It measure the energy spent in the circuit

b)

It measures the flow of electricity around the circuit

c)

It measures the flow of current in the circuit

69.

What is electronics?

a)

The study of electrical circuits and components

b)

The study of chemical reactions

c)

The study of rocks and minerals

d)

The study of fluid mechanics

e)

The study of plants and animals

70.

Which component is used to amplify electrical signals in electronic circuits?

a)

Capacitor

b)

Tristor

c)

Diode

d)

Resistor

e)

Transistor

71.

What is the basic unit of digital information in electronics?

a)

Ohm

b)

Volt

c)

Nyuton

d)

Bit

e)

Ampere

72.

What type of current do batteries typically produce?

a)

Oscillating Current (OC)

b)

Varying Current (VC)

c)

Alternating Current (AC)

d)

None of the Above

e)

Direct Current (DC)

73.

Which electronic component stores electrical charge temporarily and releases it when needed?

a)

Diode

b)

Inductor

c)

Capacitor

d)

Transistor

e)

Resistor

74.

What does IC stand for in electronics?

a)

Integrated Circuit

b)

Inductor Capacitor

c)

Internal Circuit

d)

None of the Above

e)

Intelligent Computer

75.

Which type of circuit allows current to flow in only one direction?

a)

Diode circuit

b)

Open circuit

c)

None of the Above

d)

Series circuit

e)

Parallel circuit

76.

What does AC stand for in electronics?

a)

Alternating Current

b)

Advanced Capacitor

c)

None of the Above

d)

Adjustable Current

e)

Automatic Circuit

77.

Which electronic component is used to regulate voltage in a circuit?

a)

Capacitor

b)

Resistor

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