Arrays In Data Structures — Part 1 MCQs with Explanations

O(1) is the correct answer to “What is the time complexity of accessing an element in an array by index”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

int array[10] is the correct answer to “Which of the following is the correct way to declare an array in C”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

0 is the correct answer to “What is the default value of an integer array in Java”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

array.length is the correct answer to “How do you find the length of an array in Java”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

int array[3] = {1, 2, 3} is the correct answer to “Which of the following correctly initializes an array in C++”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

O(1) is the correct answer to “What is the time complexity of inserting an element at the end of an array”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

Arrays have a fixed size is the correct answer to “Which of the following statements is true about arrays”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

An array containing multiple arrays is the correct answer to “What is a multidimensional array”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

Row-major order is the correct answer to “How are elements stored in a 2D array in memory”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

array[2] is the correct answer to “What is the correct way to access the third element of an array”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

System.arraycopy() is the correct answer to “Which of the following methods can be used to copy an array in Java”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

O(n) is the correct answer to “What is the time complexity of searching for an element in an unsorted array”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

Fixed size is the correct answer to “Which of the following is a disadvantage of arrays”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

array = [[0 for i in range(m)] for j in range(n)] is the correct answer to “How do you declare a 2D array in Python”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

Better cache locality is the correct answer to “What is the advantage of using arrays over linked lists”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

O(n) is the correct answer to “What is the time complexity of deleting an element from an array”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

They start from 0 is the correct answer to “Which of the following is true about array indexes”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

array = [0] * 5 is the correct answer to “What is the correct way to initialize an array of size 5 in Python”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

By pointer is the correct answer to “How can you pass an array to a function in C”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

Random access is the correct answer to “Which of the following is an advantage of using arrays”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

array[array.length - 1] is the correct answer to “How do you access the last element of an array in JavaScript”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

O(m + n) is the correct answer to “What is the time complexity of merging two sorted arrays”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

They can change size during runtime is the correct answer to “Which of the following statements is true about dynamic arrays”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

C is the correct answer to “In which language do arrays have a fixed size and cannot be resized”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

3 is the correct answer to “What is the output of the following C code: int array[5] = {1, 2, 3, 4, 5}; printf("%d", array[2]);”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

sort() is the correct answer to “Which function is used to sort an array in C++”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

Collections.reverse(array) is the correct answer to “How do you reverse an array in Java”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

Iterate through the array and track the largest element is the correct answer to “What is the best way to find the largest element in an unsorted array”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

int* array = new int[size] is the correct answer to “How do you dynamically allocate an array in C++”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

int array[][][] = new int[3][3][3] is the correct answer to “Which of the following is the correct way to declare a 3D array in Java”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

3 is the correct answer to “What is the output of the following Python code: array = [1, 2, 3]; print(array[-1])”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

sizeof(array)/sizeof(array[0]) is the correct answer to “Which of the following is a method to find the length of an array in C++”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

They offer O(1) access time by index is the correct answer to “Which of the following is true about array-based lists”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

When you need constant time access by index is the correct answer to “In which scenario would you prefer to use an array over a linked list”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

int[] array = {1, 2, 3, 4, 5} is the correct answer to “How do you initialize an array in Java with specific values”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

array[2] is the correct answer to “What is the correct syntax to access the third element of an array in C”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

JavaScript is the correct answer to “Which of the following languages does not support multidimensional arrays directly”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

An array with rows of different lengths is the correct answer to “What is a jagged array in C#”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

array.sort() is the correct answer to “Which method is used to sort an array in Python”. This question is standard in competitive examination syllabi for Arrays In Data Structures.

array.splice(index, 1) is the correct answer to “How do you remove an element from an array in JavaScript”. This question is standard in competitive examination syllabi for Arrays In Data Structures.