Data Representation Quizzes for Sixth Form College Computer Science Year 13

Question 1

Determine the ASCII code corresponding to the character **'A'**.

Accepted Answer

65

Answer

66

Answer

67

Answer

68

Question 2

Which data type is suitable for representing a numeric value that can have both integer and fractional components?

Accepted Answer

Float

Answer

Integer

Answer

Boolean

Answer

Character

Question 3

Differentiate between a pointer and an array. Which statement is accurate?

Accepted Answer

Pointers reference other variables, while arrays store data sequentially.

Answer

Arrays reference other variables, while pointers store data sequentially.

Answer

Arrays and pointers exhibit no distinction.

Answer

Arrays can contain pointers, but pointers cannot contain arrays.

Question 4

Describe the primary purpose of a linked list data structure.

Accepted Answer

Storing data linearly, where each node points to the subsequent node.

Answer

Storing data randomly, where each node points to the subsequent node.

Answer

Storing data hierarchically, where each node points to its parent node.

Answer

Storing data non-linearly, where each node points to multiple other nodes.

Question 5

Define a byte in terms of its bit length.

Accepted Answer

8 bits

Answer

16 bits

Answer

32 bits

Answer

64 bits

Question 6

Explain the fundamental difference between a character and a string.

Accepted Answer

A character represents a single letter, while a string is a series of characters.

Answer

A character represents a series of letters, while a string is a single letter.

Answer

Characters and strings are essentially the same.

Answer

Strings reside in RAM, whereas characters reside in ROM.

Question 7

Identify an advantage associated with utilizing a binary number system.

Accepted Answer

Enhanced processing speed

Answer

Reduced file sizes

Answer

Simplified comprehension

Answer

Improved accuracy

Question 8

Which operator in C is used to perform bitwise XOR operation?

Accepted Answer

C. ^

Answer

A. &

Answer

B. |

Answer

D. <<

Question 9

What is the primary function of a hash table data structure?

Accepted Answer

C. To efficiently store data in a key-value pair format

Answer

A. To efficiently store data in a sequential order

Answer

B. To efficiently store data in a hierarchical order

Answer

D. To efficiently store data in a tree structure

Question 10

How does the size of a byte compare to the size of a bit?

Accepted Answer

A byte is eight times larger than a bit.

Answer

A bit is four times larger than a byte.

Answer

A bit is sixteen times larger than a byte.

Answer

A byte and a bit are the same size.

Question 11

What is the primary function of a data structure?

Accepted Answer

To organize and store data systematically.

Answer

To process data rapidly and efficiently.

Answer

To secure data through encryption.

Answer

To transmit data over networks.

Question 12

What makes a stack data structure advantageous?

Accepted Answer

It allows quick access to the most recently added element.

Answer

It ensures efficient sorting of data.

Answer

It can store an unlimited number of elements.

Answer

It is the most suitable structure for representing graphs.

Question 13

What is the ASCII code point for the character 'A'?

Accepted Answer

65

Answer

66

Answer

67

Answer

68

Question 14

Which of the following data types is used to store whole numbers?

Accepted Answer

Integer

Answer

Float

Answer

String

Answer

Boolean

Question 15

What is the primary purpose of hexadecimal notation?

Accepted Answer

To simplify reading and writing binary numbers.

Answer

To represent large numbers compactly.

Answer

To store floating-point numbers.

Answer

To represent text characters.

Question 16

Which of the following image compression techniques involves data loss?

Accepted Answer

JPEG

Answer

PNG

Answer

GIF

Answer

BMP

Question 17

Which data structure enables the flexible addition and removal of elements, irrespective of their current location within the structure?

Accepted Answer

Linked List

Answer

Array

Answer

Stack

Answer

Queue

Question 18

Which of the following is **not** a fundamental data type in the C programming language?

Accepted Answer

string

Answer

int

Answer

float

Answer

char

Question 19

Which data visualization technique is best suited for showcasing trends and shifts in data over time?

Accepted Answer

Line chart

Answer

Bar chart

Answer

Pie chart

Question 20

Which data compression techniques are commonly used to optimize storage and transmission?

Accepted Answer

Lossless compression

Accepted Answer

Lossy compression

Answer

Encryption

Answer

Hashing

Question 21

In floating-point representation, which field is NOT used?

Accepted Answer

Base

Answer

Sign

Answer

Exponent

Answer

Fraction

Question 22

Which of the following is NOT a valid binary representation?

Accepted Answer

120101

Answer

001101

Answer

101011

Answer

110011

Question 23

Convert the hexadecimal number FF to its decimal equivalent.

Accepted Answer

255

Answer

254

Answer

256

Answer

257

Question 24

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

Accepted Answer

65

Answer

66

Answer

67

Answer

68

Question 25

What is the primary purpose of using data types in computer systems?

Accepted Answer

To define the range and size of data elements

Answer

To ensure data security

Answer

To improve program efficiency

Answer

To prevent data corruption

Question 26

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

Accepted Answer

A byte is 8 bits while a bit is 1 bit

Answer

A byte is 8 bits while a bit is 16 bytes

Answer

A byte is 16 bits while a bit is 8 bytes

Answer

A byte is 1 bit while a bit is 8 bits

Question 27

Which of the following methods is used to convert a string to an integer in Python?

Accepted Answer

int()

Answer

str()

Answer

float()

Answer

list()

Question 28

What is the primary role of a data structure in computer programming?

Accepted Answer

To organize and store data in an efficient and structured manner

Answer

To protect data from unauthorized access

Answer

To perform mathematical operations on data

Answer

To display data in a user-friendly manner

Question 29

What is the full form of ASCII?

Accepted Answer

American Standard Code for Information Interchange

Answer

American Standard Code for Information Transfer

Answer

American Standard Code for Information Interconnect

Question 30

Identify the ASCII code that corresponds to the character 'A'.

Accepted Answer

65

Answer

66

Answer

67

Answer

68

Question 31

Indicate the data type that is appropriate for storing a whole number without a decimal point.

Accepted Answer

Integer

Answer

Float

Answer

Char

Answer

String

Question 32

Specify the data structure that allows random access to its elements using their index.

Accepted Answer

Array

Answer

List

Answer

Stack

Answer

Queue

Question 33

Describe the primary purpose of a hash table.

Accepted Answer

Store key-value pairs for efficient lookup

Answer

Store a sorted collection of elements

Answer

Implement a first-in-first-out queue

Answer

Represent a binary tree

Question 34

Indicate the time complexity of searching for an element in a balanced binary tree.

Accepted Answer

O(log n)

Answer

O(n)

Answer

O(n^2)

Answer

O(1)

Question 35

What is the ASCII code for the lowercase letter 'a'?

Accepted Answer

97

Answer

61

Answer

72

Answer

80

Question 36

Which data structure provides efficient insertion and deletion of elements at any position?

Accepted Answer

Linked list

Answer

Array

Answer

Stack

Answer

Queue

Question 37

Which of the following is NOT a property of a binary search tree?

Accepted Answer

The tree is always perfectly balanced

Answer

Each node has at most two children

Answer

The values in the left subtree are less than the values in the right subtree

Answer

It has a unique root node

Question 38

Which of the following is **not** a valid hexadecimal digit?

Accepted Answer

9

Answer

A

Answer

F

Answer

5

Question 39

Which of the following data types **can** store a fractional value?

Accepted Answer

Float

Answer

Integer

Answer

Boolean

Answer

String

Question 40

The process of converting a decimal number to binary is known as:

Accepted Answer

Decimal to binary conversion

Answer

Binary addition

Answer

Binary subtraction

Answer

Binary to decimal conversion

Question 41

The maximum value that can be represented by an 8-bit signed integer is:

Accepted Answer

127

Answer

128

Answer

255

Answer

256

Question 42

The process of representing data in a form that can be processed by a computer is known as:

Accepted Answer

Data representation

Answer

Data conversion

Answer

Data encoding

Answer

Data compression

Question 43

When storing sensitive data like personal information or financial records, which ethical consideration is most important?

Accepted Answer

Encrypting data during storage and transmission

Answer

Prioritizing data efficiency over security and privacy

Answer

Collecting and storing data without considering potential misuses or privacy implications

Answer

Focusing on readability and accessibility over security in data representation

Question 44

Which data type is suitable for storing a whole number?

Accepted Answer

Integer

Answer

String

Answer

Boolean

Answer

Float

Question 45

Identify the data structure that enables the storage of a collection of elements in a specific sequence, providing access to any element through its index.

Accepted Answer

Array

Answer

List

Answer

Queue

Answer

Stack

Question 46

What is the primary purpose of a linked list?

Accepted Answer

Enabling dynamic item insertion and deletion

Answer

Storing data linearly

Answer

Providing fast random access to data

Answer

Representing data hierarchies

Question 47

Explain the key distinction between a queue and a stack.

Accepted Answer

Queues adhere to FIFO (First In, First Out) while stacks adhere to LIFO (Last In, First Out)

Answer

Stacks can model recursion, unlike queues

Answer

Queues offer more efficient random data access than stacks

Answer

Stacks are more efficient for item insertion and deletion than queues

Question 48

Determine the time complexity of searching for an element in a balanced binary tree with 'n' nodes.

Accepted Answer

O(log n)

Answer

O(n)

Answer

O(n^2)

Answer

O(1)

Question 49

Identify the key advantage of utilizing a hash table data structure.

Accepted Answer

Provides fast lookup and insertion operations

Answer

Guarantees the order of elements

Answer

Ensures efficient memory utilization

Answer

Facilitates simple implementation

Question 50

What is the purpose of utilizing a stack data structure?

Accepted Answer

Stores data in a last-in, first-out (LIFO) manner

Answer

Stores data in a first-in, first-out (FIFO) manner

Answer

Stores data in a random order

Answer

Stores data in a sorted order

Question 51

Identify a defining characteristic of a recursive function.

Accepted Answer

Calls itself directly or indirectly

Answer

Always terminates after a finite number of steps

Answer

Uses a loop to iterate over a set of values

Answer

Returns a value calculated using the passed parameters

Question 52

What is the primary function of a pointer?

Accepted Answer

Stores the memory address of another variable

Answer

Stores the value of another variable

Answer

Stores the type of another variable

Answer

Stores the size of another variable