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2026-1-23_100ΕΡ ΠΟΛ_Σ_Λ Υ & Δ ΚΕΦ 1,2,3,4,5,64

Total questions: 100

Worksheet time: 50mins

Name
Class
Date
1.

Multiple-choice (4 options – one answer). What is a computer system?

a)

Hardware

b)

Software

c)

Hardware and software

d)

Network

2.

Multiple-choice (4 options – one answer). Which one is system software?

a)

Word

b)

Excel

c)

Windows

d)

Chrome

3.

Multiple-choice (4 options – one answer). Which device is an input unit?

a)

Monitor

b)

Printer

c)

Keyboard

d)

Speakers

4.

Multiple-choice (4 options – one answer). Which memory is volatile?

a)

ROM

b)

RAM

c)

HDD

d)

SSD

5.

Multiple-choice (4 options – one answer). Which memory is permanent?

a)

RAM

b)

Cache

c)

ROM

d)

Register

6.

Multiple-choice (4 options – one answer). What is cache?

a)

Slow memory

b)

Peripheral memory

c)

Fast memory close to the CPU

d)

Permanent memory

7.

Multiple-choice (4 options – one answer). Which characteristic refers to the processor?

a)

Frequency

b)

Resolution

c)

Capacity

d)

Screen size

8.

Multiple-choice (4 options – one answer). The Von Neumann architecture is based on:

a)

Separate memories

b)

Common memory for data and instructions

c)

Asynchronous transmission

d)

Parallel execution

9.

Multiple-choice (4 options – one answer). What is the motherboard?

a)

Memory

b)

Peripheral

c)

Central connection circuit

d)

Software

10.

Multiple-choice (4 options – one answer). Which medium has no moving parts?

a)

HDD

b)

DVD

c)

SSD

d)

Blu-ray

11.

Multiple-choice (4 options – one answer). Which port is used for peripherals?

a)

HDMI

b)

VGA

c)

USB

d)

Ethernet

12.

Multiple-choice (4 options – one answer). What does the data bus carry?

a)

Current

b)

Instructions

c)

Data

d)

Addresses

13.

Multiple-choice (4 options – one answer). Which device is an output unit?

a)

Mouse

b)

Scanner

c)

Printer

d)

Keyboard

14.

Multiple-choice (4 options – one answer). Which signal is analog?

a)

Binary

b)

0 and 1

c)

Continuous

d)

Encoded

15.

Multiple-choice (4 options – one answer). Bit rate is measured in:

a)

Hz

b)

Baud

c)

bps

d)

Volt

16.

Multiple-choice (4 options – one answer). Serial transmission sends:

a)

Many bits simultaneously

b)

One bit each time

c)

Only analog

d)

Only wireless

17.

Multiple-choice (4 options – one answer). What is multiplexing?

a)

Coding

b)

Transmission of multiple signals over one medium

c)

Storage

d)

Switching

18.

Multiple-choice (4 options – one answer). Which switching does the Internet use?

a)

Circuit switching

b)

Message switching

c)

Packet switching

d)

Analog switching

19.

Multiple-choice (4 options – one answer). What is a computer network?

a)

A single computer

b)

Computers that communicate

c)

Software

d)

Peripherals

20.

Multiple-choice (4 options – one answer). How many layers does the OSI model have?

a)

4

b)

5

c)

6

d)

7

21.

Multiple-choice (4 options – one answer). What is the lowest OSI layer?

a)

Network

b)

Transport

c)

Physical

d)

Application

22.

Multiple-choice (4 options – one answer). LAN means:

a)

Wide area network

b)

Local area network

c)

Wireless

d)

Personal

23.

Multiple-choice (4 options – one answer). Which topology has a central node?

a)

Bus

b)

Ring

c)

Star

d)

Mesh

24.

Multiple-choice (4 options – one answer). Which device operates at OSI layer 2?

a)

Router

b)

Switch

c)

Modem

d)

Firewall

25.

Multiple-choice (4 options – one answer). Which device routes packets?

a)

Hub

b)

Switch

c)

Router

d)

Repeater

26.

Multiple-choice (4 options – one answer). Which cable is used in a LAN?

a)

HDMI

b)

Coaxial

c)

UTP

d)

Optical fiber

27.

What is UTP?

a)

Shielded

b)

Unshielded twisted pair

c)

Coaxial

d)

Optical fiber

28.

Which medium offers the highest speed?

a)

Wi‑Fi

b)

UTP

c)

Coaxial

d)

Optical fiber

29.

What is an access point?

a)

Switch

b)

Router

c)

Wireless access point

d)

Firewall

30.

Which standard relates to Wi‑Fi?

a)

802.3

b)

802.11

c)

TCP/IP

d)

SATA

31.

What is malware?

a)

Application software

b)

Malicious software

c)

Operating system

d)

Driver

32.

What is a computer virus?

a)

Hardware

b)

Protocol

c)

Malicious program

d)

Firewall

33.

What does a firewall do?

a)

Storage

b)

Printing

c)

Network traffic control

d)

Encryption

34.

What is spyware?

a)

Antivirus

b)

Spy software

c)

Operating system

d)

Driver

35.

Which password is strong?

a)

1234

b)

name

c)

Ab#9KL!

d)

date

36.

Which is a biometric method?

a)

PIN

b)

Username

c)

Fingerprint

d)

Password

37.

What is IDS?

a)

Intrusion detection system

b)

Memory

c)

Protocol

d)

Trojan

38.

Which Wi‑Fi protocol is insecure?

a)

WPA2

b)

WPA

c)

WEP

d)

HTTPS

39.

Which device connects many computers in a LAN?

a)

Router

b)

Switch

c)

Modem

d)

Firewall

40.

Which operating system is open source?

a)

Windows

b)

macOS

c)

Linux

d)

DOS

41.

What is a hotspot?

a)

Cable

b)

Wireless Internet point

c)

Virus

d)

Protocol

42.

Which device is an output device?

a)

Mouse

b)

Keyboard

c)

Screen

d)

Scanner

43.

Which medium uses microwaves?

a)

Optical fiber

b)

UTP

c)

Wi‑Fi

d)

Coaxial

44.

What is structured cabling?

a)

Random

b)

Standardized

c)

Wireless

d)

Improvised

45.

Which device operates at OSI layer 3?

a)

Switch

b)

Hub

c)

Router

d)

Repeater

46.

CPU frequency indicates which characteristic?

a)

Capacity

b)

Speed

c)

Size

d)

Type

47.

Which is a storage medium?

a)

RAM

b)

Cache

c)

HDD

d)

Register

48.

What is the first step in assembling a PC?

a)

Install OS

b)

Place the motherboard

c)

Connect to the Internet

d)

Install antivirus

49.

Which is an input peripheral?

a)

Monitor

b)

Printer

c)

Mouse

d)

Speakers

50.

Which unit executes instructions?

a)

RAM

b)

HDD

c)

CPU

d)

GPU

51.

A computer system consists of hardware and software.

a)

True

b)

False

52.

RAM is permanent memory.

a)

True

b)

False

53.

The processor executes instructions.

a)

True

b)

False

54.

ROM loses data when the computer is turned off.

a)

True

b)

False

55.

An SSD is faster than an HDD.

a)

True

b)

False

56.

HDMI carries both image and sound.

a)

True

b)

False

57.

USB is used only for charging.

a)

True

b)

False

58.

A digital signal uses 0 and 1.

a)

True

b)

False

59.

An analog signal has discrete values.

a)

True

b)

False

60.

The Internet uses packet switching.

a)

True

b)

False

61.

A LAN covers a small area.

a)

True

b)

False

62.

A WAN covers a small area.

a)

True

b)

False

63.

A switch operates at OSI layer 2.

a)

True

b)

False

64.

The router operates at OSI layer 3.

a)

True

b)

False

65.

UTP is a shielded cable.

a)

True

b)

False

66.

Optical fiber is not affected by interference.

a)

True

b)

False

67.

Wi‑Fi uses microwaves.

a)

True

b)

False

68.

An access point provides wireless access.

a)

True

b)

False

69.

A firewall increases Internet speed.

a)

True

b)

False

70.

Malware is malicious software.

a)

True

b)

False

71.

Viruses need a host file.

a)

True

b)

False

72.

Spyware spies on the user.

a)

True

b)

False

73.

A strong password has simple characters.

a)

True

b)

False

74.

Biometric authentication is based on physical characteristics.

a)

True

b)

False

75.

IDS detects attacks.

a)

True

b)

False

76.

WEP is a secure protocol.

a)

True

b)

False

77.

WPA2 is more secure than WEP.

a)

True

b)

False

78.

An operating system is application software.

a)

True

b)

False

79.

Cache increases speed.

a)

True

b)

False

80.

Bit rate is measured in bps.

a)

True

b)

False

81.

Multiplexing enables shared use of a medium.

a)

True

b)

False

82.

OSI has 5 layers.

a)

True

b)

False

83.

The physical layer concerns cables.

a)

True

b)

False

84.

A switch connects computers in a LAN.

a)

True

b)

False

85.

A hotspot provides Internet.

a)

True

b)

False

86.

RAM is used for permanent storage.

a)

True

b)

False

87.

An HDD is faster than an SSD.

a)

True

b)

False

88.

The motherboard connects all components.

a)

True

b)

False

89.

Antivirus detects malicious software.

a)

True

b)

False

90.

Structured cabling is standardized.

a)

True

b)

False

91.

USB is a network protocol.

a)

True

b)

False

92.

Linux is open source.

a)

True

b)

False

93.

A router connects different networks.

a)

True

b)

False

94.

HDMI carries only audio.

a)

True

b)

False

95.

An SSD has moving parts.

a)

True

b)

False

96.

A firewall can be hardware or software.

a)

True

b)

False

97.

Wi‑Fi is a wired network.

a)

True

b)

False

98.

LAN is a wireless network.

a)

True

b)

False

99.

The CPU is a processing unit.

a)

True

b)

False

100.

Information security concerns only viruses.

a)

True

b)

False

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