Data Representation Quizzes for Year 11 Computing Students

Question 1

Why are standardized data representation methods primarily used?

Accepted Answer

To facilitate data interoperability and exchange

Answer

To enhance data security

Answer

To improve data accuracy

Answer

To reduce data storage requirements

Question 2

Which data compression technique replaces repeated sequences of characters with shorter codes?

Accepted Answer

Huffman encoding

Answer

Lempel-Ziv encoding

Answer

Arithmetic encoding

Answer

Shannon-Fano encoding

Question 3

What is the main advantage of using hexadecimal representation over binary representation?

Accepted Answer

It is more compact and easier to read.

Answer

It uses fewer symbols.

Answer

It allows for easier error detection.

Answer

It is more efficient for storage.

Question 4

What is the primary purpose of data compression?

Accepted Answer

Reducing data size without compromising information

Answer

Enlarging data size for easier storage

Answer

Encrypting data for enhanced security

Answer

Converting data into a different format

Question 5

Identify the error detection and correction method that employs a checksum.

Accepted Answer

Cyclic redundancy check (CRC)

Answer

Parity check

Answer

Hamming code

Answer

Reed-Solomon code

Question 6

What is the primary goal of data compression?

Accepted Answer

To minimize storage requirements

Answer

To accelerate data transfer

Answer

To improve data security

Answer

To enhance data accuracy

Question 7

Which data compression method results in a loss of some original data?

Accepted Answer

JPEG

Answer

GIF

Answer

PNG

Answer

ZIP

Question 8

What is the binary representation of the decimal number 7?

Accepted Answer

101

Answer

110

Answer

111

Answer

100

Question 9

What is the purpose of a checksum?

Accepted Answer

To detect errors in data storage or transmission.

Answer

To correct errors in data storage or transmission.

Answer

To speed up data storage or transmission.

Answer

To secure data storage or transmission.

Question 10

What is the data type specifically used to represent a single character?

Accepted Answer

Character

Answer

Integer

Answer

Boolean

Answer

Float

Question 11

What is the primary purpose of error correction codes?

Accepted Answer

To identify and rectify errors in data transmissions

Answer

To minimize data file sizes

Answer

To encrypt sensitive data

Answer

To convert binary data to hexadecimal format

Question 12

Distinguish between a bit and a byte.

Accepted Answer

A bit is a binary digit, while a byte comprises 8 bits

Answer

A bit is a single binary digit, while a byte comprises 2 bits

Answer

A bit is a decimal digit, while a byte is a binary digit

Answer

A bit is a group of 8 bytes, while a byte is a single bit

Question 13

What is the primary advantage of storing data in binary format?

Accepted Answer

Efficiency in data storage

Answer

Enhanced data security

Answer

Increased data reliability

Answer

Simplified data processing

Question 14

Which of the following ASCII codes represents the uppercase letter 'A'?

Accepted Answer

01100001

Answer

01000001

Answer

10000001

Answer

11000001

Question 15

What ASCII code represents the lowercase letter 'b'?

Accepted Answer

97

Answer

98

Answer

99

Answer

100

Question 16

Which of the following is a primary purpose of data compression?

Accepted Answer

Reducing the size of data for efficient storage and transmission

Answer

Increasing the security of data

Answer

Making data more readable

Answer

Converting data into different formats

Question 17

What is the key distinction between lossless and lossy data compression?

Accepted Answer

Lossless compression preserves all original data, while lossy compression discards non-essential information.

Answer

Lossless compression discards non-essential information, while lossy compression preserves all original data.

Answer

Lossless compression is faster than lossy compression.

Answer

Lossy compression requires more computational resources than lossless compression.

Question 18

How does the choice of data representation method influence the performance and efficiency of machine learning algorithms?

Accepted Answer

Data representation methods can affect the computational complexity and accuracy of machine learning algorithms.

Answer

Data representation methods have no impact on performance or efficiency.

Answer

Binary representation is always the optimal choice for machine learning algorithms.

Answer

Data compression techniques are unrelated to the performance of machine learning algorithms.

Question 19

What is the ASCII code for the uppercase letter 'A'?

Accepted Answer

65

Answer

97

Answer

101

Answer

110

Question 20

Which of the following is the primary purpose of a parity bit?

Accepted Answer

To detect errors in data transmission

Answer

To correct errors in data transmission

Answer

To compress data

Answer

To encrypt data

Question 21

Which of the following data compression techniques preserves all the original data without any loss?

Accepted Answer

Huffman coding

Answer

JPEG compression

Answer

MP3 compression

Answer

MPEG compression

Question 22

Find the ASCII code for the uppercase letter 'A'.

Accepted Answer

65

Answer

66

Answer

67

Answer

64

Question 23

What is the primary purpose of a parity bit?

Accepted Answer

To detect errors in data transmission

Answer

To compress data

Answer

To encrypt data

Answer

To convert data from one representation to another

Question 24

What is the ASCII code for the uppercase letter 'A'?

Accepted Answer

65

Answer

67

Answer

66

Question 25

Which lossless data compression technique uses variable-length codes to represent data?

Accepted Answer

Huffman Coding

Answer

Lempel-Ziv-Welch (LZW)

Answer

Run-Length Encoding (RLE)

Answer

Arithmetic Coding

Question 26

What is the main purpose of a checksum in error detection?

Accepted Answer

To detect errors that may have occurred during data transmission

Answer

To prevent errors from occurring during data transmission

Answer

To correct errors that may have occurred during data transmission

Question 27

What is the purpose of adding a parity bit to a binary string?

Accepted Answer

To ensure that the total number of 1s in the string is either always even or always odd

Answer

To identify the start and end of a data transmission

Answer

To correct errors that may have occurred during data transmission

Question 28

What is the main difference between a bit and a byte?

Accepted Answer

A byte is a set of eight bits

Answer

A bit is a set of eight bytes

Answer

There is no difference between a bit and a byte

Question 29

Which method is commonly used to represent images in digital format?

Accepted Answer

Bitmap

Answer

Vector

Answer

ASCII

Question 30

What is the primary function of a file extension?

Accepted Answer

To indicate the type of data contained in a file

Answer

To identify the author of a file

Answer

To encrypt the data stored in a file

Question 31

What is the main purpose of data compression?

Accepted Answer

To reduce the size of data for more efficient storage or transmission without losing any information.

Answer

To protect data from unauthorized access.

Answer

To increase the speed of data transfer only.

Question 32

Which of the following is a lossless data compression technique?

Accepted Answer

Lempel-Ziv-Welch (LZW)

Answer

JPEG

Answer

GIF

Answer

MP3

Question 33

What is the primary purpose of a checksum?

Accepted Answer

To detect errors in data transmission by comparing the calculated checksum with the received checksum.

Answer

To correct errors in data transmission.

Answer

To compress data.

Answer

To encrypt data.

Question 34

Which of the following is a significant benefit of using Hamming code?

Accepted Answer

It can detect and correct multiple errors within a specific range.

Answer

It is simple to implement and understand.

Answer

It is highly efficient and requires minimal computational resources.

Answer

It can always detect and correct all errors.

Question 35

What is the fundamental difference between data representation and data conversion?

Accepted Answer

Data representation involves how data is stored, whereas data conversion is the process of changing data from one representation to another.

Answer

Data representation is the same as data compression.

Answer

Data representation is always more complex than data conversion.

Question 36

ASCII is a code primarily used to represent:

Accepted Answer

Characters

Answer

Sounds

Answer

Numbers

Answer

Images

Question 37

Identify the lossless data compression technique:

Accepted Answer

Huffman coding

Answer

JPEG

Answer

MP3

Answer

GIF

Question 38

Which error detection and correction method utilizes a parity bit?

Accepted Answer

Vertical Redundancy Check (VRC)

Answer

Cyclic Redundancy Check (CRC)

Answer

Hamming code

Answer

Longitudinal Redundancy Check (LRC)

Question 39

The process of converting an analog signal into a digital equivalent is known as:

Accepted Answer

Analog-to-digital conversion (ADC)

Answer

Quantization

Answer

Digital-to-analog conversion (DAC)

Answer

Sampling

Question 40

Which of the following is NOT considered a computer file type?

Accepted Answer

Analog file

Answer

Sound file

Answer

Text file

Answer

Image file

Question 41

Identify an example of a network file system:

Accepted Answer

NFS

Answer

NTFS

Answer

FAT

Answer

ext4

Question 42

Which binary representation corresponds to the decimal number 13?

Accepted Answer

1101

Answer

1111

Answer

1011

Answer

1001

Question 43

Which error detection and correction method utilizes a parity bit?

Accepted Answer

Simple parity check

Answer

Cyclic Redundancy Check (CRC)

Answer

Reed-Solomon code

Answer

Hamming code

Question 44

Explain the difference between lossless and lossy data compression.

Accepted Answer

Lossless compression preserves all the original data, while lossy compression introduces some distortion to reduce file size.

Answer

Lossless compression is significantly faster than lossy compression.

Question 45

What is the primary function of a checksum in data transmission?

Accepted Answer

To detect errors in the transmitted data.

Answer

To guarantee that the data is delivered in the correct sequence.

Answer

To encrypt the data for secure transmission.

Answer

To compress the data before transmission.

Question 46

What is the purpose of using a look-up table in data compression?

Accepted Answer

To enhance compression efficiency by storing frequently used character codes for quicker access.

Answer

To detect errors in the compressed data.

Answer

To generate random codes for data encryption.