Arrays: Implementation and Operations - Interactive Learning Quizzes

Question 1

How is memory allocated for an array?

Accepted Answer

As a contiguous block of memory

Answer

As non-contiguous blocks of memory

Answer

Chosen by the operating system

Answer

Chosen by the compiler

Question 2

What is the time complexity of accessing an element in an array by index?

Accepted Answer

O(1)

Answer

O(log n)

Answer

O(n)

Answer

O(n^2)

Question 3

What is the time complexity of accessing an element of an array by index?

Accepted Answer

O(1)

Answer

O(log n)

Answer

O(n)

Answer

O(n^2)

Question 4

Which of the following is an advantage of using arrays?

Accepted Answer

Both of the above

Answer

Random access to elements

Answer

Efficient memory utilization

Question 5

Array Length Property:
The 'length' property of an array primarily indicates:

Accepted Answer

The number of elements currently stored in the array

Answer

The maximum number of elements the array can hold

Answer

The size of each element in the array

Answer

The type of elements the array can store

Question 6

Key Difference Between Arrays and Singly Linked Lists:
The fundamental difference between an array and a singly linked list is:

Accepted Answer

Arrays store elements contiguously, while linked lists do not.

Answer

Arrays have fixed size, while linked lists are dynamic.

Answer

Linked lists allow random access, while arrays do not.

Answer

Linked lists are more efficient for searching than arrays.

Question 7

Array Declaration in Python:
Which of the following is the correct syntax to declare an array in Python?

Accepted Answer

array = [1, 2, 3]

Answer

array(1, 2, 3)

Answer

array[] = {1, 2, 3}

Answer

int[3] array = {1, 2, 3}

Question 8

Time Complexity of Array Element Access:
The time complexity of accessing an element at a specific index in an array is:

Accepted Answer

O(1)

Answer

O(log n)

Answer

O(n)

Answer

O(n^2)

Question 9

Purpose of a Sentinel Value in Arrays:
The purpose of a sentinel value in an array is primarily to:

Accepted Answer

Mark the end of valid data in the array

Answer

Improve the efficiency of searching algorithms

Answer

Prevent accessing invalid memory locations

Answer

Store metadata about the array

Question 10

Sparse vs Dense Arrays:
The primary distinction between a sparse and a dense array is:

Accepted Answer

Sparse arrays have many empty elements, while dense arrays do not.

Answer

Sparse arrays are stored more efficiently than dense arrays.

Answer

Sparse arrays are typically used for representing graphs, while dense arrays are used for matrices.

Answer

Sparse arrays are created dynamically, while dense arrays are static.

Question 11

Efficient Sorting Algorithm for Nearly Sorted Arrays:
Which of the following sorting algorithms is most efficient for arrays that are nearly sorted?

Accepted Answer

Insertion Sort

Answer

Bubble Sort

Answer

Merge Sort

Answer

Quick Sort

Question 12

What is the term for the process of dynamically adjusting the size of an array?

Accepted Answer

Array resizing

Answer

Array expansion

Answer

Array contraction

Answer

Dynamic allocation

Question 13

In JavaScript, how do you access the second element of an array called 'numbers'?

Accepted Answer

numbers[1]

Answer

numbers[0]

Answer

numbers.get(1)

Question 14

Which memory allocation technique allocates contiguous memory blocks for the elements of an array?

Accepted Answer

Static allocation

Answer

Dynamic allocation

Answer

Linked allocation

Answer

Stack allocation

Question 15

For an array of size 'n' (using zero-based indexing), what is the index of its last element?

Accepted Answer

n - 1

Answer

n

Answer

n + 1

Answer

n / 2

Question 16

What is the primary purpose of using a sentinel value in an array?

Accepted Answer

To indicate the end of valid data

Answer

To enhance the efficiency of search algorithms

Answer

To prevent array overflow

Answer

To store additional information about array elements

Question 17

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

Accepted Answer

One-dimensional arrays store elements in a single row, while two-dimensional arrays store elements in rows and columns.

Answer

Two-dimensional arrays can be indexed with a single index, while one-dimensional arrays require two indices.

Answer

One-dimensional arrays are always fixed in size, while two-dimensional arrays can be resized dynamically.

Answer

There is no difference between a one-dimensional array and a two-dimensional array.

Question 18

Which operation is NOT supported by Java arrays?

Accepted Answer

Deleting an element from the middle of the array

Answer

Inserting an element at a specific index

Answer

Performing binary search on the array

Answer

Sorting the array in ascending order

Question 19

What is the significance of the 'length' property of an array in Java?

Accepted Answer

It stores the number of elements currently stored in the array.

Answer

It determines the maximum size of the array.

Answer

It provides a mechanism to iterate over the array elements.

Answer

It is used to initialize the array with default values.

Question 20

Which of the following Java array methods can be used to copy the contents of one array to another?

Accepted Answer

arrayCopy()

Answer

clone()

Answer

copy()

Answer

toArray()

Question 21

What is the time complexity of accessing an element in an array using its index?

Accepted Answer

O(1)

Answer

O(n)

Answer

O(n^2)

Answer

O(log n)

Question 22

Which algorithm efficiently searches an array for an element with a time complexity of O(n)?

Accepted Answer

Sequential Search

Answer

Binary Search

Answer

Interpolation Search

Answer

Hashing

Question 23

To create a 2D integer array named 'matrix' with 3 rows and 4 columns in Java, which code snippet is correct?

Accepted Answer

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

Answer

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

Answer

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

Question 24

Which limitation is inherent to arrays in programming?

Accepted Answer

Fixed size

Answer

Dynamic memory allocation

Answer

Efficient memory usage

Answer

Easy to implement

Question 25

Which of the following Python statements initializes an array of 5 integers?

Accepted Answer

my_array = [0] * 5

Answer

my_array = new int[5];

Answer

my_array = list(5)

Answer

int my_array[5] = {0, 0, 0, 0, 0};

Question 26

Consider the following C++ code:int[] arr = new int[5]; Which statement correctly initializes the array with values [1, 2, 3, 4, 5]?

Accepted Answer

for (int i = 0; i < 5; i++) { arr[i] = i + 1; }

Answer

for (int i = 1; i <= 5; i++) { arr[i] = i; }

Answer

for (int i = 0; i < 5; i++) { arr[i] = i; }

Question 27

Which of the following Java methods is used to sort an array in ascending order?

Accepted Answer

Arrays.sort()

Answer

Arrays.search()

Answer

Arrays.copy()

Question 28

Consider the following Python code:my_array = [1, 2, 3, 4, 5] What is the output of the following code?
reversed_array = my_array[::-1]
print(reversed_array)

Accepted Answer

[5, 4, 3, 2, 1]

Answer

[]

Answer

[1, 2, 3, 4, 5]

Answer

[4, 3, 2, 1]

Question 29

Which of the following sorting algorithms is an in-place sorting algorithm?

Accepted Answer

Bubble Sort

Answer

Heap Sort

Answer

Radix Sort

Answer

Merge Sort

Question 30

Which of the following Python methods is used to copy one array to another?

Accepted Answer

copy()

Answer

duplicate()

Answer

clone()

Answer

assign()

Question 31

Consider the following PHP code:

$my_array = array(1, 2, 3, 4, 5);

What is the output of the following code?

print_r(array_reverse($my_array));

Accepted Answer

[5, 4, 3, 2, 1]

Answer

[1, 2, 3, 4, 5]

Answer

[]

Answer

[4, 3, 2, 1]

Question 32

Which of the following Python libraries provides specialized functions for working with numpy arrays?

Accepted Answer

NumPy

Answer

Scikit-learn

Answer

Pandas

Question 33

Which operation is performed in O(log n) time on a sorted array of size n?

Accepted Answer

Binary search

Answer

Linear search

Answer

Merge sort

Answer

Bubble sort

Question 34

Consider an array `arr` of size 5 sorted in ascending order. Which search technique can find an element in the array efficiently?

Accepted Answer

Binary search

Answer

Exponential search

Answer

Linear search

Answer

Interpolation search

Question 35

Which of the following is a key advantage of using arrays?

Accepted Answer

Efficient random access

Answer

Dynamic resizing

Answer

Storage of heterogeneous data types

Answer

Automatic memory release

Question 36

Consider two sorted arrays `arr1` and `arr2`, both of size 5. Which operation can merge them into a single sorted array efficiently?

Accepted Answer

Merge sort

Answer

Selection sort

Answer

Quick sort

Answer

Bubble sort

Question 37

Which data structure is suitable for implementing a queue using arrays?

Accepted Answer

Circular buffer

Answer

Hash table

Answer

Linked list

Answer

Binary tree

Question 38

Which of the following defines a multidimensional array?

Accepted Answer

An array with multiple indices, representing data in multiple dimensions.

Answer

An array that is always contiguous in memory.

Answer

An array with multiple data types.

Question 39

What is the starting index of an array?

Accepted Answer

0

Answer

1

Answer

-1

Answer

It is not specified.

Question 40

Which operation cannot be performed directly on an array?

Accepted Answer

Adding an element at a specific index

Answer

Sorting the array

Answer

Traversing the array

Answer

Searching for an element

Question 41

What is the time complexity of retrieving an element from an array?

Accepted Answer

O(1)

Answer

O(n)

Answer

O(n^2)

Answer

O(log n)

Question 42

Which advantage do arrays offer?

Accepted Answer

Efficient memory allocation.

Answer

Dynamic resizing.

Answer

Automatic garbage collection.

Answer

Thread safety.

Question 43

Define a jagged array.

Accepted Answer

An array of arrays with potentially different lengths.

Answer

An array that is sorted in ascending order.

Answer

An array with elements of different data types.

Answer

An array that can be resized dynamically.

Question 44

Which sorting algorithm is most efficient for large arrays?

Accepted Answer

Merge sort

Answer

Bubble sort

Answer

Selection sort

Question 45

Provide an example use case for multidimensional arrays.

Accepted Answer

Representing a matrix or a grid.

Answer

Implementing a stack or a queue.

Answer

Storing a list of strings.

Answer

Creating a hash table.

Question 46

What is the primary function of the clone() method for arrays?

Accepted Answer

Creates a new array that is a shallow copy of the original array.

Answer

Copies array elements to a new location in memory.

Answer

Sorts the array in ascending order.

Question 47

Define an array.

Accepted Answer

A contiguous block of memory that stores a fixed-size collection of elements of the same data type.

Answer

A variable that can store a single value of any type.

Answer

A linked list of elements that can store different data types.

Question 48

Which of the following is an advantage of using arrays?

Accepted Answer

Fast element access due to contiguous memory allocation.

Answer

Efficient storage of diverse data types.

Answer

Dynamic memory allocation, allowing the array to expand as needed.

Question 49

What is the purpose of the subscript or index in an array?

Accepted Answer

To uniquely identify each element within the array.

Answer

To store the number of elements in the array.

Answer

To indicate the starting memory address of the array.

Question 50

What fundamental difference distinguishes one-dimensional arrays from multi-dimensional arrays?

Accepted Answer

Number of indices required to access elements.

Answer

Data type of the elements

Answer

Storage layout in memory

Answer

Size of the array

Question 51

Which of the following applications commonly utilizes multi-dimensional arrays?

Accepted Answer

Storing a matrix or table of data.

Answer

Implementing a queue

Answer

Representing a linked list

Answer

Storing a collection of objects

Question 52

For an array of size n, what is the time complexity of finding the minimum element?

Accepted Answer

O(n)

Answer

O(log n)

Answer

O(1)

Answer

O(n^2)

Question 53

Which sorting algorithm is considered highly efficient for large arrays?

Accepted Answer

Merge Sort

Answer

Selection Sort

Answer

Insertion Sort

Answer

Bubble Sort