Master Arrays: A Comprehensive Guide for Graduate Students in Computer Science

Question 1

Which of the following is NOT a feature of arrays in Python?

Accepted Answer

Python arrays have a fixed size that cannot be changed.

Answer

Arrays are ordered collections of data.

Answer

Python arrays can store elements of different data types.

Question 2

Which of the following is not a type of array in computer science?

Accepted Answer

Linked List

Answer

One-Dimensional

Answer

Multidimensional

Answer

Jagged

Question 3

What is a potential drawback of using arrays in programming?

Accepted Answer

Fixed size memory allocation

Answer

Efficient data access

Answer

Storing diverse data types

Answer

Flexible resizing

Question 4

Which of the following is not a type of array used in programming languages?

Accepted Answer

Linked List

Answer

Multi-Dimensional Array

Answer

Jagged Array

Answer

Associative Array

Question 5

An array can be used to store which of the following types of data items?

Accepted Answer

Homogeneous data items of the same data type

Answer

Complex data structures only

Answer

Any type of data, including heterogeneous data items

Answer

Non-primitive data types only

Question 6

What is the key difference between a one-dimensional and a two-dimensional array?

Accepted Answer

A two-dimensional array has rows and columns, while a one-dimensional array has only a single dimension.

Answer

A two-dimensional array is stored contiguously in memory, while a one-dimensional array is not.

Answer

A one-dimensional array can hold only primitive data types, while a two-dimensional array can hold complex data types.

Question 7

Which of the following operations are commonly performed on arrays?

Accepted Answer

Traversing, Searching, Sorting, Inserting, Deleting

Answer

Only Inserting and Deleting

Answer

Only Traversing and Searching

Question 8

In C++, a two-dimensional array can be declared using which of the following syntaxes?

Accepted Answer

int arr[rows][cols];

Answer

int **arr[rows][cols];

Answer

int arr[rows, cols];

Answer

int* arr[rows * cols];

Question 9

What is the primary distinction between sparse and dense arrays?

Accepted Answer

A sparse array has a significant number of empty or unused elements, while a dense array has few or no empty elements.

Answer

A sparse array is stored contiguously in memory, while a dense array is not.

Answer

A sparse array is more efficient for storing large datasets, while a dense array is more efficient for small datasets.

Answer

A sparse array is typically used for representing graphs, while a dense array is used for representing matrices.

Question 10

Which technique can be employed to implement a queue data structure using arrays?

Accepted Answer

Circular Buffer

Answer

Hashing

Answer

Linked List

Answer

Binary Search Tree

Question 11

To create a single-dimensional array named 'myArray' of size 5 in Java, which syntax is correct?

Accepted Answer

int[] myArray = new int[5];

Answer

int[][] myArray = new int[5];

Answer

int[] myArray = new int();

Answer

int myArray = new int[5];

Question 12

Which operations are valid for arrays?

Accepted Answer

All mentioned operations

Answer

Searching for an array element

Answer

Deleting an array element

Answer

Inserting an array element

Question 13

What is the primary use case for multidimensional arrays?

Accepted Answer

To store data in a tabular or multilevel structure

Answer

To represent data in hierarchical form

Answer

To store data of diverse types

Answer

To compress data efficiently

Question 14

Which of the following algorithms is widely used for sorting arrays?

Accepted Answer

Merge Sort

Answer

Breadth-First Search

Answer

Binary Search

Question 15

What is the time complexity for accessing an element in an array?

Accepted Answer

O(1)

Answer

O(n)

Answer

O(log n)

Answer

O(n^2)

Question 16

What distinguishes a jagged array from a multidimensional array?

Accepted Answer

Jagged arrays possess inner arrays of varying lengths

Answer

Multidimensional arrays provide greater versatility than jagged arrays

Answer

Multidimensional arrays have fixed-length inner arrays

Answer

Jagged arrays offer better efficiency than multidimensional arrays

Question 17

In C++, what is the recommended approach for initializing an array?

Accepted Answer

Using curly braces {} for initialization

Answer

Using the '=' sign for initialization

Answer

Using parentheses () for initialization

Answer

Using square brackets [] for initialization

Question 18

Which of the following is a key benefit of using arrays in programming?

Accepted Answer

They provide efficient data storage

Answer

They allow for dynamic memory allocation

Answer

They automatically convert data types

Answer

They improve code readability

Question 19

Which data structure is a collection of elements of the same type that are accessed using a common name?

Accepted Answer

Array

Answer

Queue

Answer

Linked list

Answer

Tree

Question 20

Which syntax is correct for declaring a 2D array in Java?

Accepted Answer

int[][] myArray = new int[3][4];

Answer

int[] myArray = new int[3][4];

Answer

int myArray[3][4];

Answer

int[3][4] myArray;

Question 21

What is the purpose of the 'length' property of an array?

Accepted Answer

It indicates the number of elements in the array

Answer

It modifies the size of the array

Answer

It sorts the elements of the array

Answer

It accesses the first element of the array

Question 22

Which of the following is a typical application of arrays?

Accepted Answer

Storing data in a structured manner

Answer

Creating dynamic data structures

Answer

Representing complex objects

Answer

Performing mathematical calculations

Question 23

What is the time complexity for accessing an element in an array?

Accepted Answer

Constant (O(1))

Answer

Linear (O(n))

Answer

Quadratic (O(n^2))

Answer

Logarithmic (O(log n))

Question 24

Which of the following is NOT an advantage of using arrays?

Accepted Answer

Dynamic resizing

Answer

Organized data storage

Answer

Fast data access

Answer

Efficient memory usage

Question 25

What is a jagged array?

Accepted Answer

An array whose elements are arrays of potentially different lengths

Answer

An array with duplicate elements

Answer

An array that can be dynamically resized

Answer

An array with a non-uniform distribution of elements

Question 26

Which of the following is a recommended practice when working with arrays?

Accepted Answer

Declaring arrays with a specific size when possible

Answer

Using arrays to store data of different types

Answer

Accessing array elements beyond their bounds

Answer

Modifying arrays while iterating over them

Question 27

Which of the following is NOT a characteristic of an array?

Accepted Answer

Dynamic size

Answer

Ordered collection of elements

Answer

Indexed elements

Answer

Homogeneous elements

Question 28

What is the purpose of a multidimensional array?

Accepted Answer

To store data in a tabular or hierarchical structure

Answer

To allow for dynamic resizing of the array

Answer

To increase the memory efficiency of the program

Question 29

What is the key difference between a static and a dynamic array?

Accepted Answer

Static arrays have a fixed size, while dynamic arrays can be resized

Answer

Static arrays are faster than dynamic arrays

Answer

Dynamic arrays are more secure than static arrays

Question 30

Which of the following operations on an array can be performed in constant time (O(1))?

Accepted Answer

Accessing an element by index

Answer

Finding the maximum element

Answer

Inserting an element at the beginning

Answer

Deleting an element in the middle

Question 31

What is the most common way to traverse an array?

Accepted Answer

Using a for loop

Answer

Using a while loop

Answer

Using recursion

Answer

Using a do-while loop

Question 32

What is the primary advantage of using arrays in programming?

Accepted Answer

Efficient storage and retrieval of related data

Answer

Simplified data sorting

Answer

Reduced memory usage

Answer

Improved readability

Question 33

Which of the following is NOT a valid way to declare an array in Java?

Accepted Answer

int[] myArray = {1, 2, 3}; int[] myArray;

Answer

int[] myArray = new int[] {1, 2, 3};

Answer

int[] myArray;

Answer

int[] myArray = new int[3];

Question 34

What is the purpose of the length property in an array?

Accepted Answer

Returns the number of elements in the array

Answer

Determines the type of elements stored in the array

Answer

Sets the maximum size of the array

Answer

Initializes the array with default values

Question 35

What is the difference between a heterogeneous array and a homogeneous array?

Accepted Answer

Heterogeneous arrays can store different data types, while homogeneous arrays store only one data type

Answer

Heterogeneous arrays are more efficient than homogeneous arrays

Question 36

Which of the following algorithms is commonly used for efficiently searching a sorted array?

Accepted Answer

Binary Search

Answer

Bubble Sort

Answer

Quick Sort

Answer

Merge Sort

Question 37

What is the time complexity of searching for an element in an unsorted array using linear search?

Accepted Answer

O(n)

Answer

O(log n)

Answer

O(1)

Answer

O(n^2)

Question 38

What is the difference between passing an array by value and passing an array by reference?

Accepted Answer

Passing by value creates a copy of the array, while passing by reference modifies the original array

Answer

Passing by reference is not supported in all programming languages

Answer

Passing by value is faster than passing by reference

Question 39

Identify the primary advantage of using arrays:

Accepted Answer

Efficient storage and retrieval of related data

Answer

Dynamic memory allocation without explicit deallocation

Answer

Concurrent access to data

Answer

Object-oriented programming capabilities

Question 40

What is the primary purpose of an array index?

Accepted Answer

To uniquely identify the location of an element within the array

Answer

To store the data value of the corresponding array element

Answer

To determine the total number of elements in the array

Question 41

Which of the following operations is applicable to multi-dimensional arrays?

Accepted Answer

Traversing elements row-wise or column-wise

Answer

Searching for a specific element using a linear search

Answer

Reversing the order of elements in the array

Answer

Sorting elements in non-increasing order

Question 42

What is the time complexity for accessing an element in a single-dimensional array?

Accepted Answer

O(1)

Answer

O(n)

Answer

O(log n)

Question 43

Which of the following array sorting algorithms operates with a time complexity of O(n^2)?

Accepted Answer

Bubble sort

Answer

Quick sort

Answer

Merge sort

Answer

Heap sort

Question 44

What is an advantage of employing an associative array?

Accepted Answer

Efficient data retrieval using a key-value pair

Answer

Faster insertion and deletion of elements

Answer

Reduced memory usage compared to other array types

Question 45

What is the main advantage of using an array over individual variables for storing data?

Accepted Answer

Arrays allow efficient storage and retrieval of a collection of data using a single identifier.

Answer

Arrays can store data of different types, while individual variables can only hold one type.

Answer

Arrays simplify the declaration and initialization process compared to individual variables.

Question 46

Which data structure is most suitable for representing a list of students in a class, where each student has a name and grade?

Accepted Answer

Array of structures (or array of objects)

Answer

Queue

Answer

Linked list

Answer

Stack

Question 47

If an array is declared as `int numbers[5]`, what is the valid range of indices to access its elements?

Accepted Answer

0 to 4

Answer

-1 to 4

Answer

1 to 5

Answer

0 to 5

Question 48

What is the most common method used to process all elements of a one-dimensional array?

Accepted Answer

Looping (using a `for` or `while` loop)

Answer

Recursion

Answer

Hashing

Question 49

In an array named `scores` declared as `int scores[10]`, how would you access the element at index 5 in most programming languages?

Accepted Answer

scores[5]

Answer

scores(5)

Answer

scores.get(5)

Answer

scores.at(5)

Question 50

Which scenario is NOT a suitable use case for arrays?

Accepted Answer

Storing a variable number of elements that can expand or shrink dynamically.

Answer

Representing a fixed-size collection of student records.

Answer

Storing a list of product prices.

Question 51

What is the key difference between a one-dimensional array and a multi-dimensional array?

Accepted Answer

One-dimensional arrays store data in a single row, while multi-dimensional arrays arrange data in rows and columns.

Answer

One-dimensional arrays are generally more efficient than multi-dimensional arrays.

Question 52

You need to create an array to store monthly rainfall data for a year. Which data type and dimension would be appropriate?

Accepted Answer

One-dimensional array of floating-point numbers.

Answer

One-dimensional array of strings.

Answer

Linked list of floating-point numbers.

Answer

Two-dimensional array of integers.

Question 53

Given the array `int ages[5] = {25, 30, 22, 35, 28};`, what is the value of `ages[2]`?

Accepted Answer

22

Answer

35

Answer

30

Answer

25

Question 54

What is the primary benefit of using a sorted array compared to an unsorted array?

Accepted Answer

Sorted arrays enable efficient searching using algorithms like binary search.

Answer

Sorted arrays use less memory than unsorted arrays.

Answer

Sorted arrays are easier to initialize and manage.