computer MCQs - 11th class Chapter 03 Mcqs

1

What is the term for the exchange of data between two devices via a transmission medium like a wire cable?

A

Data Processing

B

Data Communications

C

Data Storage

D

Data Analysis

2

Which of the following is NOT one of the five components of a data communication system?

A

Sender

B

Receiver

C

Protocol

D

Message

3

What component in the data communication system is the information or data to be communicated?

A

Channel

B

Encoder

C

Message

D

Receiver

4

The physical path by which data travels from a sender to a receiver is called the?

A

Encoder

B

Protocol

C

Network

D

Communication Channel

5

What is the function of an Encoder in a data communication system?

A

To convert analog signals to a human-readable format

B

To convert digital signals to a form that can pass through the transmission medium

C

To receive the data

D

To create the original message

6

What is the function of a Decoder?

A

To send the data

B

To convert an encoded signal back into its digital form

C

To choose the transmission medium

D

To generate the message

7

Electromagnetic or light waves representing data are called?

A

Packets

B

Frames

C

Signals

D

Bytes

8

Which type of signal is continuous and in the form of a wave?

A

Digital signal

B

Binary signal

C

Analog signal

D

Discrete signal

9

A digital signal uses on-off electrical pulses in what form?

A

Continuous

B

Wave

C

Analog

D

Discontinuous or discrete

10

Frequency is the number of times a wave repeats during a specific time interval, while amplitude is the _______ of the wave.

A

Speed

B

Length

C

Height

D

Width

11

What type of data consists of words, sentences, and paragraphs?

A

Numeric

B

Audio

C

Text

D

Image

12

Which type of data includes charts, graphs, and freehand drawings?

A

Video

B

Image

C

Audio

D

Text

13

Data representation in computers is based on _______ numbers, which means two digits (0 and 1).

A

Decimal

B

Octal

C

Hexadecimal

D

Binary

14

What is the smallest element of data in a computer?

A

Byte

B

Bit

C

Character

D

Word

15

Which encoding scheme is a 4-bit code?

A

ASCII

B

EBCDIC

C

BCD

D

Unicode

16

EBCDIC is an 8-bit code primarily used by which company?

A

Microsoft

B

Apple

C

IBM

D

ANSI

17

ASCII, a 7-bit code, was developed by which organization?

A

IBM

B

IEEE

C

ISO

D

ANSI

18

How many symbols can a 16-bit Unicode represent?

A

256

B

1024

C

128

D

65,536

19

In which mode of data communication does data flow in only one direction?

A

Full-duplex

B

Half-duplex

C

Simplex

D

Multiplex

20

An example of Simplex communication is?

A

A telephone conversation

B

A walkie-talkie

C

Internet surfing

D

Radio broadcast

21

In Half-duplex mode, data can be transmitted in both directions, but...?

A

Simultaneously

B

Only in packets

C

Not at the same time

D

Very slowly

22

Which communication mode is similar to traffic on a two-lane road, allowing data transmission in both directions simultaneously?

A

Simplex

B

Half-duplex

C

Full-duplex

D

Asynchronous

23

Full-duplex communication is made possible by devices called?

A

Modems

B

Repeaters

C

Multiplexers

D

Hubs

24

Which type of data transmission involves the concurrent flow of bits through separate communication lines?

A

Serial

B

Parallel

C

Simplex

D

Asynchronous

25

Serial data transmission sends data in what fashion?

A

In parallel groups

B

Bit-by-bit sequentially

C

In random order

D

As a single block

26

Which transmission type is also called start/stop transmission?

A

Synchronous

B

Parallel

C

Isochronous

D

Asynchronous

27

In asynchronous transmission, what value does a start bit have?

A

1

B

0

C

It varies

D

It has no value

28

What does synchronous transmission use to control the timing of bits being sent?

A

Start/stop bits

B

A clock

C

Parity checks

D

An acknowledgement signal

29

What is the term for the measure of the transmission rate of a communications channel?

A

Speed

B

Frequency

C

Bandwidth

D

Latency

30

Which technique places digital signals directly onto the transmission line without modulation?

A

Broadband

B

Baseband

C

Multiplexing

D

Encoding

31

Broadband uses which technique to transmit several streams of data simultaneously on different frequencies?

A

TDM

B

FDM

C

WDM

D

CDM

32

Channels that transmit data through a physical medium like a cable are called?

A

Unguided Media

B

Wireless Media

C

Guided Media

D

Unbound Media

33

Twisted pair, coaxial cable, and fiber optic cable are all examples of what?

A

Unguided Media

B

Broadband Media

C

Wireless Media

D

Guided Media

34

Which guided medium consists of a single solid copper core and can handle many telephone transmissions?

A

Twisted Pair

B

Coaxial Cable

C

Fiber-Optic Cable

D

Shielded Pair

35

Which medium transmits data as pulses of light through tubes of glass?

A

Coaxial Cable

B

Microwave

C

Satellite

D

Fiber-Optic Cable

36

The characteristic of a material to either pass or reflect light is known as?

A

Reflection

B

Refraction

C

Modulation

D

Transmission

37

Microwave and satellite systems are examples of which type of media?

A

Guided Media

B

Bounded Media

C

Unguided Media

D

Cabled Media

38

What is a major drawback of satellite transmission mentioned in the text?

A

It is slow

B

It has low capacity

C

Bad weather can severely affect it

D

It requires physical cables

39

The process of converting digital signals into analog form to be sent over phone lines is called?

A

Demodulation

B

Encoding

C

Modulation

D

Multiplexing

40

The process of converting an analog signal back to a digital signal is known as?

A

Modulation

B

Decoding

C

Demodulation

D

Amplification

41

A modem's raw speed (without data compression) is determined by its?

A

Power supply

B

Physical size

C

Modulation standards

D

Cable type

42

According to the text, a high-speed modem features modulation at what speed or higher?

A

2400 bps

B

4800 bps

C

9600 bps

D

14400 bps

43

Which type of modem is a circuit board that can be added to the system unit through an expansion slot?

A

External Modem

B

Internal Card Modem

C

Wireless Modem

D

PCMCIA Modem

44

A modem that transmits data signals through the air instead of a cable is called a?

A

External Modem

B

Internal Modem

C

Radio-frequency modem

D

Dial-up modem

45

What is the primary purpose of twisting the wires in a twisted pair cable?

A

To increase strength

B

To make it flexible

C

To minimize interference

D

To increase bandwidth

46

An idle asynchronous line is identified with what value?

A

0

B

1

C

A null signal

D

A clock pulse

47

What does the acronym ASCII stand for?

A

Associated Standard Code for Information Interchange

B

American Standard Code for Information Interchange

C

American Symbolic Code for Information Interchange

D

Associated Symbolic Code for Information Interchange

48

Which communication mode is generally used for interactions between a computer and its printing unit?

A

Serial

B

Full-duplex

C

Simplex

D

Parallel

49

Which coding scheme is designed for efficient transfer between hosts that use it for their internal character representation?

A

ASCII

B

Unicode

C

BCD

D

EBCDIC

50

Refraction is an important characteristic of which communication medium?

A

Coaxial Cable

B

Twisted Pair

C

Microwave

D

Fiber-Optic Cable